A puzzle game CodeChef Solution

Problem -A puzzle game CodeChef Solution

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This website is dedicated for CodeChef solution where we will publish right solution of all your favourite CodeChef problems along with detailed explanatory of different competitive programming concepts and languages.

A puzzle game CodeChef Solution in C++14

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#include <bits/stdc++.h>

#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")//Comment optimisations for interactive problems (use endl)
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

using namespace std;

struct PairHash {inline std::size_t operator()(const std::pair<int, int> &v) const { return v.first * 31 + v.second; }};

// speed
#define Code ios_base::sync_with_stdio(false);
#define By ios::sync_with_stdio(0);
#define Sumfi cout.tie(NULL);

// alias
using ll = long long;
using ld = long double;
using ull = unsigned long long;

// constants
const ld PI = 3.14159265358979323846;  /* pi */
const ll INF = 1e18;
const ld EPS = 1e-9;
const ll MAX_N = 202020;
const ll mod = 1e9 + 7;

// typedef
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef array<ll,3> all3;
typedef array<ll,5> all5;
typedef vector<all3> vall3;
typedef vector<all5> vall5;
typedef vector<ld> vld;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<int> vi;
typedef deque<ll> dqll;
typedef deque<pll> dqpll;
typedef pair<string, string> pss;
typedef vector<pss> vpss;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef unordered_set<ll> usll;
typedef unordered_set<pll, PairHash> uspll;
typedef unordered_map<ll, ll> umll;
typedef unordered_map<pll, ll, PairHash> umpll;

// macros
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,m,n) for(ll i=n;i>=m;i--)
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define INF(a) memset(a,0x3f3f3f3f3f3f3f3fLL,sizeof(a))
#define ASCEND(a) iota(all(a),0)
#define sz(x) ll((x).size())
#define BIT(a,i) (a & (1ll<<i))
#define BITSHIFT(a,i,n) (((a<<i) & ((1ll<<n) - 1)) | (a>>(n-i)))
#define pyes cout<<"Yes\n";
#define pno cout<<"No\n";
#define endl "\n"
#define pneg1 cout<<"-1\n";
#define ppossible cout<<"Possible\n";
#define pimpossible cout<<"Impossible\n";
#define TC(x) cout<<"Case #"<<x<<": ";
#define X first
#define Y second

// utility functions
template <typename T>
void print(T &&t)  { cout << t << "\n"; }
template<typename T>
void printv(vector<T>v){ll n=v.size();rep(i,0,n){cout<<v[i];if(i+1!=n)cout<<' ';}cout<<endl;}
template<typename T>
void printvln(vector<T>v){ll n=v.size();rep(i,0,n)cout<<v[i]<<endl;}
void fileIO(string in = "input.txt", string out = "output.txt") {freopen(in.c_str(),"r",stdin); freopen(out.c_str(),"w",stdout);}
void readf() {freopen("", "rt", stdin);}
template<typename T>
void readv(vector<T>& v){rep(i,0,sz(v)) cin>>v[i];}
template<typename T, typename U>
void readp(pair<T,U>& A) {cin>>A.first>>A.second;}
template<typename T, typename U>
void readvp(vector<pair<T,U>>& A) {rep(i,0,sz(A)) readp(A[i]); }
void readvall3(vall3& A) {rep(i,0,sz(A)) cin>>A[i][0]>>A[i][1]>>A[i][2];}
void readvall5(vall5& A) {rep(i,0,sz(A)) cin>>A[i][0]>>A[i][1]>>A[i][2]>>A[i][3]>>A[i][4];}
void readvvll(vvll& A) {rep(i,0,sz(A)) readv(A[i]);}

struct Combination {
    vll fac, inv;
    ll n, MOD;

    ll modpow(ll n, ll x, ll MOD = mod) { if(!x) return 1; ll res = modpow(n,x>>1,MOD); res = (res * res) % MOD; if(x&1) res = (res * n) % MOD; return res; }

    Combination(ll _n, ll MOD = mod): n(_n + 1), MOD(MOD) {
        inv = fac = vll(n,1);
        rep(i,1,n) fac[i] = fac[i-1] * i % MOD;
        inv[n - 1] = modpow(fac[n - 1], MOD - 2, MOD);
        rrep(i,1,n - 2) inv[i] = inv[i + 1] * (i + 1) % MOD;
    }

    ll fact(ll n) {return fac[n];}
    ll nCr(ll n, ll r) {
        if(n < r or n < 0 or r < 0) return 0;
        return fac[n] * inv[r] % MOD * inv[n-r] % MOD;
    }
};

struct Matrix {
    ll r,c;
    vvll matrix;
    Matrix(ll r, ll c, ll v = 0): r(r), c(c), matrix(vvll(r,vll(c,v))) {}

    Matrix operator*(const Matrix& B) const {
        Matrix res(r, B.c);
        rep(i,0,r) rep(j,0,B.c) rep(k,0,B.r) {
                    res.matrix[i][j] = (res.matrix[i][j] + matrix[i][k] * B.matrix[k][j] % mod) % mod;
                }
        return res;
    }

    Matrix copy() {
        Matrix copy(r,c);
        copy.matrix = matrix;
        return copy;
    }

    Matrix pow(ll n) {
        assert(r == c);
        Matrix res(r,r);
        Matrix now = copy();
        rep(i,0,r) res.matrix[i][i] = 1;
        while(n) {
            if(n & 1) res = res * now;
            now = now * now;
            n /= 2;
        }
        return res;
    }
};

// geometry data structures
template <typename T>
struct Point {
    T y,x;
    Point(T y, T x) : y(y), x(x) {}
    Point(pair<T,T> p) : y(p.first), x(p.second) {}
    Point() {}
    void input() {cin>>y>>x;}
    friend ostream& operator<<(ostream& os, const Point<T>& p) { os<<p.y<<' '<<p.x<<'\n'; return os;}
    Point<T> operator+(Point<T>& p) {return Point<T>(y + p.y, x + p.x);}
    Point<T> operator-(Point<T>& p) {return Point<T>(y - p.y, x - p.x);}
    Point<T> operator*(ll n) {return Point<T>(y*n,x*n); }
    Point<T> operator/(ll n) {return Point<T>(y/n,x/n); }
    bool operator<(const Point &other) const {if (x == other.x) return y < other.y;return x < other.x;}
    Point<T> rotate(Point<T> center, ld angle) {
        ld si = sin(angle * PI / 180.), co = cos(angle * PI / 180.);
        ld y = this->y - center.y;
        ld x = this->x - center.x;

        return Point<T>(y * co - x * si + center.y, y * si + x * co + center.x);
    }
    ld distance(Point<T> other) {
        T dy = abs(this->y - other.y);
        T dx = abs(this->x - other.x);
        return sqrt(dy * dy + dx * dx);
    }

    T norm() { return x * x + y * y; }
};

template<typename T>
struct Line {
    Point<T> A, B;
    Line(Point<T> A, Point<T> B) : A(A), B(B) {}
    Line() {}

    void input() {
        A = Point<T>();
        B = Point<T>();
        A.input();
        B.input();
    }

    T ccw(Point<T> &a, Point<T> &b, Point<T> &c) {
        T res = a.x * b.y + b.x * c.y + c.x * a.y;
        res -= (a.x * c.y + b.x * a.y + c.x * b.y);
        return res;
    }

    bool isIntersect(Line<T> o) {
        T p1p2 = ccw(A,B,o.A) * ccw(A,B,o.B);
        T p3p4 = ccw(o.A,o.B,A) * ccw(o.A,o.B,B);
        if (p1p2 == 0 && p3p4 == 0) {
            pair<T,T> p1(A.y, A.x), p2(B.y,B.x), p3(o.A.y, o.A.x), p4(o.B.y, o.B.x);
            if (p1 > p2) swap(p2, p1);
            if (p3 > p4) swap(p3, p4);
            return p3 <= p2 && p1 <= p4;
        }
        return p1p2 <= 0 && p3p4 <= 0;
    }

    pair<bool,Point<ld>> intersection(Line<T> o) {
        if(!this->intersection(o)) return {false, {}};
        ld det = 1. * (o.B.y-o.A.y)*(B.x-A.x) - 1.*(o.B.x-o.A.x)*(B.y-A.y);
        ld t = ((o.B.x-o.A.x)*(A.y-o.A.y) - (o.B.y-o.A.y)*(A.x-o.A.x)) / det;
        return {true, {A.y + 1. * t * (B.y - A.y), B.x + 1. * t * (B.x - A.x)}};
    }

    //@formula for : y = ax + b
    //@return {a,b};
    pair<ld, ld> formula() {
        T y1 = A.y, y2 = B.y;
        T x1 = A.x, x2 = B.x;
        if(y1 == y2) return {1e9, 0};
        if(x1 == x2) return {0, 1e9};
        ld a = 1. * (y2 - y1) / (x2 - x1);
        ld b = -x1 * a + y1;
        return {a, b};
    }
};

template<typename T>
struct Circle {
    Point<T> center;
    T radius;
    Circle(T y, T x, T radius) : center(Point<T>(y,x)), radius(radius) {}
    Circle(Point<T> center, T radius) : center(center), radius(radius) {}
    Circle() {}

    void input() {
        center = Point<T>();
        center.input();
        cin>>radius;
    }

    bool circumference(Point<T> p) {
        return (center.x - p.x) * (center.x - p.x) + (center.y - p.y) * (center.y - p.y) == radius * radius;
    }

    bool intersect(Circle<T> c) {
        T d = (center.x - c.center.x) * (center.x - c.center.x) + (center.y - c.center.y) * (center.y - c.center.y);
        return (radius - c.radius) * (radius - c.radius) <= d and d <= (radius + c.radius) * (radius + c.radius);
    }

    bool include(Circle<T> c) {
        T d = (center.x - c.center.x) * (center.x - c.center.x) + (center.y - c.center.y) * (center.y - c.center.y);
        return d <= radius * radius;
    }
};

ll __gcd(ll x, ll y) { return !y ? x : __gcd(y, x % y); }
all3 __exgcd(ll x, ll y) { if(!y) return {x,1,0}; auto [g,x1,y1] = __exgcd(y, x % y); return {g, y1, x1 - (x/y) * y1}; }
ll __lcm(ll x, ll y) { return x / __gcd(x,y) * y; }
ll modpow(ll n, ll x, ll MOD = mod) { n%=MOD; if(!x) return 1; ll res = modpow(n,x>>1,MOD); res = (res * res) % MOD; if(x&1) res = (res * n) % MOD; return res; }

unordered_map<string, ll> dp;

usll prime{2,3,5,7,11,13,17,19};

ll dy[2]{1,0}, dx[2]{0,1};

ll helper(string now) {
    if(dp.count(now)) return dp[now];
    ll& res = dp[now] = INF;
    rep(i,0,3) rep(j,0,3) {
        rep(k,0,2) {
            ll ny = i + dy[k], nx = j + dx[k];
            if(0 <= ny and ny < 3 and 0 <= nx and nx < 3 and prime.count(now[i * 3 + j] - '0' + now[ny * 3 + nx] - '0')) {
                swap(now[i * 3 + j], now[ny * 3 + nx]);
                res = min(res, 1 + helper(now));
                swap(now[i * 3 + j], now[ny * 3 + nx]);
            }
        }
    }
    return res;
}

void init() {
    dp["123456789"] = 0;
    queue<string> q;
    q.push("123456789");
    while(sz(q)) {
        string now = q.front(); q.pop();
        ll v = dp[now];
        rep(i,0,3) rep(j,0,3) {
                rep(k,0,2) {
                    ll ny = i + dy[k], nx = j + dx[k];
                    if(0 <= ny and ny < 3 and 0 <= nx and nx < 3 and prime.count(now[i * 3 + j] - '0' + now[ny * 3 + nx] - '0')) {
                        swap(now[i * 3 + j], now[ny * 3 + nx]);
                        if(!dp.count(now)) {
                            dp[now] = v + 1;
                            q.push(now);
                        }
                        swap(now[i * 3 + j], now[ny * 3 + nx]);
                    }
                }
            }
    }
}

ll solve(vvll A) {
    dp["123456789"] = 0;
    string now = "";
    rep(i,0,3) rep(j,0,3) now.push_back(A[i][j] + '0');
    return dp.count(now) ? dp[now] : -1;
}

int main() {
    Code By Sumfi
    cout.precision(12);
    ll tc = 1;
    init();
    cin>>tc;
    rep(i,1,tc+1) {
        vvll A(3,vll(3));
        readvvll(A);
        print(solve(A));
    }
    return 0;
}

A puzzle game CodeChef Solution in PYTH 3

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# cook your dish here
# cook your dish here
prime = [2,3,5,7,11,13,17]
edges = [(0,3), (0,1), (1,2), (1,4), (2,5), (3,4), (3,6), (4,5), (4,7), (5,8), (6,7), (7,8)]

x = (1, 2, 3, 4, 5, 6, 7, 8, 9)

avail = {x: 0}
queue = [x]
while queue:
    current = queue.pop(0)
    for e in edges:
        if current[e[0]] + current[e[1]] in prime:
            nxt = list(current)
            nxt[e[0]], nxt[e[1]] = nxt[e[1]], nxt[e[0]]
            nxt = tuple(nxt)
            if nxt not in avail:
                avail[nxt] = avail[current] + 1 
                queue.append(nxt)

for _ in range(int(input())):
    input()
    grid = ()
    for i in range(3):
        grid += tuple(map(int, input().split()))
    print(avail[grid] if grid in avail else -1)

A puzzle game CodeChef Solution in C

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#include<stdio.h>
int front, rear;
int q[362880/2];
char dis[98765432];
int curr_s;
int board[3*3];
int isprime(int x)
{
    if(x==2||x==3||x==5||x==7||x==11||x==13||x==17)
    return 1;
    return 0;
}
int pow(int n)
{
    int ans=1;
    for(int i=0;i<n;i++)
    {
        ans*=10;
    }
    return ans;
}
void swap(int i, int j)
{ int d = board[j]-board[i];
    int ns = curr_s + d*pow(8-i) -d*pow(8-j);
    if(dis[ns/10]==0)
    {
        dis[ns/10] = dis[curr_s/10]+1;
        q[rear++] = ns;
    }
}
void create_all_states()
{
    int i;
    int s;
    front = 0;
    while(front<rear)
      while(front<rear)
    {
        s = curr_s = q[front];
        for(int i=8;i>=0;i--)
        {
            board[i]=s%10;
            s = s/10;
        }
        if(isprime(board[0]+board[1])) swap(0,1);
        if(isprime(board[0]+board[3])) swap(0,3);
        if(isprime(board[1]+board[2])) swap(1,2);
        if(isprime(board[1]+board[4])) swap(1,4);
        if(isprime(board[2]+board[5])) swap(2,5);
        if(isprime(board[3]+board[4])) swap(3,4);
        if(isprime(board[3]+board[6])) swap(3,6);
        if(isprime(board[4]+board[5])) swap(4,5);
        if(isprime(board[4]+board[7])) swap(4,7);
        if(isprime(board[5]+board[8])) swap(5,8);
        if(isprime(board[6]+board[7])) swap(6,7);
        if(isprime(board[7]+board[8])) swap(7,8);
        front++;
    }
}
int main() 
{
    rear=0;
    q[rear] = 123456789;
    rear++;
    dis[12345678]=1;
    create_all_states();
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int state = 0;
        for(int i=0;i<9;i++)
        {
            int temp;
                        scanf("%d",&temp);
            state = state*10 + temp;
        }
        printf("%d\n", dis[state/10]-1);
    }
}

A puzzle game CodeChef Solution in JAVA

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import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Queue;
import java.util.Scanner;

public class Main {
	static final int SIZE = 3;
	static final String TARGET_STATE = "123456789";
	static final int[] R_OFFSET = { 0, 1 };
	static final int[] C_OFFSET = { 1, 0 };

	static Map<String, Integer> stateToStep = buildStateToStep();

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int t = sc.nextInt();
		for (int tc = 0; tc < t; tc++) {
			int[][] board = new int[SIZE][SIZE];
			for (int r = 0; r < SIZE; r++) {
				for (int c = 0; c < SIZE; c++) {
					board[r][c] = sc.nextInt();
				}
			}

			System.out.println(solve(board));
		}

		sc.close();
	}

	static Map<String, Integer> buildStateToStep() {
		Map<String, Integer> stateToStep = new HashMap<>();
		stateToStep.put(TARGET_STATE, 0);
		Queue<String> queue = new LinkedList<>();
		queue.offer(TARGET_STATE);

		while (!queue.isEmpty()) {
			String state = queue.poll();
			int[][] board = decode(state);

			for (int r = 0; r < SIZE; r++) {
				for (int c = 0; c < SIZE; c++) {
					for (int i = 0; i < R_OFFSET.length; i++) {
						int nextR = r + R_OFFSET[i];
						int nextC = c + C_OFFSET[i];

						if (nextR < SIZE && nextC < SIZE && isPrime(board[r][c] + board[nextR][nextC])) {
							swap(board, r, c, nextR, nextC);

							String nextState = encode(board);
							if (!stateToStep.containsKey(nextState)) {
								stateToStep.put(nextState, stateToStep.get(state) + 1);
								queue.offer(nextState);
							}

							swap(board, r, c, nextR, nextC);
						}
					}
				}
			}
		}

		return stateToStep;
	}

	static boolean isPrime(int n) {
		if (n < 2) {
			return false;
		}

		for (int i = 2; i * i <= n; i++) {
			if (n % i == 0) {
				return false;
			}
		}
		return true;
	}

	static void swap(int[][] board, int r1, int c1, int r2, int c2) {
		int temp = board[r1][c1];
		board[r1][c1] = board[r2][c2];
		board[r2][c2] = temp;
	}

	static String encode(int[][] board) {
		StringBuilder state = new StringBuilder();
		for (int r = 0; r < SIZE; r++) {
			for (int c = 0; c < SIZE; c++) {
				state.append(board[r][c]);
			}
		}
		return state.toString();
	}

	static int[][] decode(String state) {
		int[][] board = new int[SIZE][SIZE];
		for (int r = 0; r < SIZE; r++) {
			for (int c = 0; c < SIZE; c++) {
				board[r][c] = state.charAt(r * SIZE + c) - '0';
			}
		}
		return board;
	}

	static int solve(int[][] board) {
		return stateToStep.getOrDefault(encode(board), -1);
	}
}

A puzzle game CodeChef Solution in PYPY 3

“ ”

from math import *
import sys
def input():
     return sys.stdin.readline().replace('\n','').strip()
sys.setrecursionlimit(10**9)
intf = 10**20
pr = [3,5,7,11,13,17,19]
ind = [(0,1),(1,2),(3,4),(4,5),(6,7),(7,8),(0,3),(3,6),(1,4),(4,7),(2,5),(5,8)]
queue = [[1,2,3,4,5,6,7,8,9]]
memo={}
memo[(1,2,3,4,5,6,7,8,9)]=0
while len(queue)>0:
    el=queue.pop(0)
    cur_l=el
    for a,b in ind:
        if cur_l[a] + cur_l[b] in pr:
            l1 = list(cur_l)
            l1[a],l1[b]=l1[b],l1[a]
            if tuple(l1) not in memo:
                queue.append(l1)
                memo[tuple(l1)]=memo[tuple(cur_l)]+1
                
for i in range(int(input())):
    input()
    l=[int(i) for i  in (input()+" "+input()+" "+input()).split()]
    if tuple(l) in memo:
        print(memo[tuple(l)])
    else:
        print(-1)

A puzzle game CodeChef Solution in PYTH

“ ”

from collections import defaultdict
D = defaultdict(int)
L = []
L.append([1,2,3,4,5,6,7,8,9,0])
MX = 1
S = set()
Z = 123456789
S.add(Z)
SW = [[0,1],[0,3],[1,2],[1,4],[2,5],[3,4],[3,6],[4,5],[4,7],[5,8],[6,7],[7,8]]
PR = [3,5,7,11,13,17]
p = 0
while p < MX:
	R = L[p]
	for sw in SW:
		x = sw[0]
		y = sw[1]
		if R[x]+R[y] in PR:
			NL = list(R)
			NL[x],NL[y] = NL[y],NL[x]
			v = 0
			for x in range(9):
				v = 10*v + NL[x]
			# endfor x
			if not (v in S):
				S.add(v)
				D[v] = MX
				MX += 1
				NL[9] += 1
				L.append(list(NL))
			# endif
		# endif
	# next sw
	p += 1
# endwhile
t = int(raw_input())
for i in xrange(t):
	st = raw_input()
	v = 0
	for k in range(3):
		st = raw_input()
		for z in st.strip().split(" "):
			v = 10*v + int(z)
		# endfor z
	# endfor k
	p = D[v]
	if p == 0:
		if v == Z:
			print '0'
		else:
			print '-1'
		# endif
	else:
		print L[p][9]
	# endif
# endfor i

A puzzle game CodeChef Solution in C#

“ ”

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication
{
    public class Program
    {
        public static int Main(string[] args)
        {
            var returnCode = 0;
            var testCasesCount = GetNextIntegerLine();
            for (var i = 0; i < testCasesCount; i++)
            {
                HandleTestCase();
                if (i < testCasesCount - 1)
                {
                    Console.Write("\n");
                }
            }
            return returnCode;
        }

        public static int[] GetArrayFromConsole()
        {
            Console.ReadLine();
            var inputs = string.Join(" ", new[] { ReadLine(), ReadLine(), ReadLine() })
                               .Split(' ')
                               .Select(int.Parse)
                               .ToArray();
            return inputs;
        }
        private static Dictionary<int, int> _results = new Dictionary<int, int>
        {
            {987654321, 0}
        };

        private static void HandleTestCase()
        {
            var queue = new Queue<int[]>();
            queue.Enqueue(new[]{1,2,3,4,5,6,7,8,9});
            while (queue.Any())
            {
                var currentInputs = queue.Dequeue();
                var possibleMovements = GetPossibleMovement(currentInputs);
                var currentSignature = GetSignature(currentInputs);
                var movementCount = _results[currentSignature];

                foreach (var possibleMovement in possibleMovements)
                {
                    var signature = GetSignature(possibleMovement);
                    var previousMovementCount = 0;
                    if (!_results.TryGetValue(signature, out previousMovementCount))
                    {
                        _results.Add(signature, movementCount + 1);
                        queue.Enqueue(possibleMovement);
                    }
                    else if (previousMovementCount > movementCount + 1)
                    {
                        _results[signature] = movementCount + 1;
                    }
                }
            }

            var inputs = GetArrayFromConsole();
            int result = 0;
            if (_results.TryGetValue(GetSignature(inputs), out result))
            {
                Console.Write(result.ToString());
            }
            else
            {
                Console.Write("-1");
            }
        }

        public static IEnumerable<int[]> GetPossibleMovement(int[] currentInputs)
        {
            int currentIndex = 0;

            for (var i = 0; i < 3; i++)
            {
                for (var j = 0; j < 3; j++)
                {
                    currentIndex = i + j * 3;

                    if (i < 2 && IsPrime(currentInputs[currentIndex] + currentInputs[currentIndex + 1]))
                    {
                        var testedMovement = (int[])currentInputs.Clone();
                        Swap(ref testedMovement[currentIndex], ref testedMovement[currentIndex + 1]);
                        yield return testedMovement;
                    }

                    if (j < 2 && IsPrime(currentInputs[currentIndex] + currentInputs[currentIndex + 3]))
                    {
                        var testedMovement = (int[])currentInputs.Clone();
                        Swap(ref testedMovement[currentIndex], ref testedMovement[currentIndex + 3]);
                        yield return testedMovement;
                    }
                }
            }
        }

        static int[] _primes = new[] { 2, 3, 5, 7, 11, 13, 17, 19 };
        public static bool IsPrime(int number) => _primes.Contains(number);

        public static void Swap(ref int a, ref int b)
        {
            var c = a;
            a = b;
            b = c;
        }

        public static int GetSignature(int[] inputs) =>
        inputs[0] * 1 +
        inputs[1] * 10 +
        inputs[2] * 100 +
        inputs[3] * 1000 +
        inputs[4] * 10000 +
        inputs[5] * 100000 +
        inputs[6] * 1000000 +
        inputs[7] * 10000000 +
        inputs[8] * 100000000;

        private static string ReadLine()
        {
            return Console.ReadLine().Trim();
        }

        private static int GetNextIntegerLine()
        {
            return int.Parse(Console.ReadLine());
        }
    }
}

A puzzle game CodeChef Solution in GO

“ ”

package main

import (
	"bufio"
	"bytes"
	"fmt"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)

	tc := readNum(reader)
	var buf bytes.Buffer
	for tc > 0 {
		tc--
		reader.ReadBytes('\n')

		grid := make([][]int, 3)
		for i := 0; i < 3; i++ {
			grid[i] = readNNums(reader, 3)
		}
		res := solve(grid)
		buf.WriteString(fmt.Sprintf("%d\n", res))
	}
	fmt.Print(buf.String())
}

func readUint64(bytes []byte, from int, val *uint64) int {
	i := from

	var tmp uint64
	for i < len(bytes) && bytes[i] >= '0' && bytes[i] <= '9' {
		tmp = tmp*10 + uint64(bytes[i]-'0')
		i++
	}
	*val = tmp

	return i
}

func readInt(bytes []byte, from int, val *int) int {
	i := from
	sign := 1
	if bytes[i] == '-' {
		sign = -1
		i++
	}
	tmp := 0
	for i < len(bytes) && bytes[i] >= '0' && bytes[i] <= '9' {
		tmp = tmp*10 + int(bytes[i]-'0')
		i++
	}
	*val = tmp * sign
	return i
}

func readString(reader *bufio.Reader) string {
	s, _ := reader.ReadString('\n')
	for i := 0; i < len(s); i++ {
		if s[i] == '\n' || s[i] == '\r' {
			return s[:i]
		}
	}
	return s
}

func readNum(reader *bufio.Reader) (a int) {
	bs, _ := reader.ReadBytes('\n')
	readInt(bs, 0, &a)
	return
}

func readTwoNums(reader *bufio.Reader) (a int, b int) {
	res := readNNums(reader, 2)
	a, b = res[0], res[1]
	return
}

func readThreeNums(reader *bufio.Reader) (a int, b int, c int) {
	res := readNNums(reader, 3)
	a, b, c = res[0], res[1], res[2]
	return
}

func readNNums(reader *bufio.Reader, n int) []int {
	res := make([]int, n)
	x := 0
	bs, _ := reader.ReadBytes('\n')
	for i := 0; i < n; i++ {
		for x < len(bs) && (bs[x] < '0' || bs[x] > '9') && bs[x] != '-' {
			x++
		}
		x = readInt(bs, x, &res[i])
	}
	return res
}

const N = 362880

var dp []int

var primes map[int]bool
var pos map[int64]int

func init() {
	primes = make(map[int]bool)
	set := make([]bool, 20)
	for i := 2; i < 20; i++ {
		if !set[i] {
			primes[i] = true
			for j := i + i; j < 20; j += i {
				set[j] = true
			}
		}
	}

	arr := make([]int64, 9)

	next := func(num int64) int64 {
		for i := 8; i >= 0; i-- {
			arr[i] = num % 10
			num /= 10
		}
		i := len(arr) - 2
		for i >= 0 && arr[i] > arr[i+1] {
			i--
		}
		if i < 0 {
			return -1
		}
		// arr[i] < arr[i+1]
		j := len(arr) - 1
		for arr[i] > arr[j] {
			j--
		}
		// j will at least be i+1
		arr[i], arr[j] = arr[j], arr[i]

		for a, b := i+1, len(arr)-1; a < b; a, b = a+1, b-1 {
			arr[a], arr[b] = arr[b], arr[a]
		}

		var ans int64

		for i := 0; i < len(arr); i++ {
			ans = ans*10 + arr[i]
		}
		return ans
	}

	nums := make([]int64, N)
	var cur int64 = 123456789
	dp = make([]int, N)
	pos = make(map[int64]int)
	for i := 0; i < N; i++ {
		nums[i] = cur
		pos[cur] = i
		cur = next(cur)
		dp[i] = -1
	}

	dp[0] = 0

	que := make([]int, N)
	var front, end int
	que[end] = 0
	end++

	for front < end {
		cur := que[front]
		front++
		num := nums[cur]
		neighors := move(num, arr)

		for _, x := range neighors {
			i := pos[x]
			if dp[i] < 0 {
				dp[i] = dp[cur] + 1
				que[end] = i
				end++
			}
		}
	}

}

func move(num int64, buf []int64) []int64 {
	// len(buf) = 9
	for i := 8; i >= 0; i-- {
		buf[i] = num % 10
		num /= 10
	}

	var res []int64

	for i := 0; i < 3; i++ {
		for j := 0; j < 3; j++ {
			x := buf[i*3+j]
			if j+1 < 3 && primes[int(buf[i*3+j+1]+x)] {
				buf[i*3+j], buf[i*3+j+1] = buf[i*3+j+1], buf[i*3+j]
				res = append(res, toNum(buf))
				buf[i*3+j], buf[i*3+j+1] = buf[i*3+j+1], buf[i*3+j]
			}
			if i+1 < 3 && primes[int(buf[(i+1)*3+j]+x)] {
				buf[i*3+j], buf[i*3+j+3] = buf[i*3+j+3], buf[i*3+j]
				res = append(res, toNum(buf))
				buf[i*3+j], buf[i*3+j+3] = buf[i*3+j+3], buf[i*3+j]
			}
		}
	}

	return res
}

func toNum(arr []int64) int64 {
	var res int64
	for i := 0; i < len(arr); i++ {
		res = res*10 + arr[i]
	}
	return res
}

func solve(grid [][]int) int {
	buf := make([]int64, 9)
	for i := 0; i < 3; i++ {
		for j := 0; j < 3; j++ {
			buf[i*3+j] = int64(grid[i][j])
		}
	}
	num := toNum(buf)

	i := pos[num]

	return dp[i]
}

A puzzle game CodeChef Solution Review:

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