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Equal LIS CodeChef Solution

Problem -Equal LIS CodeChef Solution

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.

Equal LIS CodeChef Solution in C++17

/*ॐ Arpit Blagan ॐ*/
#include<bits/stdc++.h>
using namespace std;
#define all(arr) arr.begin(),arr.end()
#define rep(i,s,e) for(int i=s;i<e;i++)
#define lli long long int
#define ll long long
const ll INF=1e18;
const int mod=1e9+7;
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int t;cin>>t;
	while(t--){
		int n;cin>>n;
		if(n==2){cout<<"NO\n";}
		else{	cout<<"YES\n";	
				int mid=n/2;
				vector<int>ans;
				for(int i=1;i<=mid;i++){ans.push_back(i);}
				for(int i=n;i>mid;i--){ans.push_back(i);}
				if(n%2==0){swap(ans[0],ans[1]);}
				for(auto it:ans){cout<<it<<" ";}cout<<"\n";
		}
	}
	return 0;
}

Equal LIS CodeChef Solution in C++14

#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 = 101010;
const ll mod = 998244353;

// 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; }

vll solve(ll n) {
    if(n == 1) return {1};
    if(n == 2) return {};
    if(n & 1) {
        dqll res{n};
        n -= 1;
        while(n) {
            res.push_back(n);
            res.push_front(n-1);
            n -= 2;
        }
        return vll(all(res));
    }
    vll res;
    for(ll i = 3; i < n; i += 2) res.push_back(i);
    res.push_back(1);
    for(ll i = n; i >= 2; i -= 2) res.push_back(i);
    return res;
}
int main() {
    Code By Sumfi
    cout.precision(12);
    ll tc = 1;
    cin>>tc;
    rep(i,1,tc+1) {
        ll n;
        cin>>n;
        auto res = solve(n);
        if(sz(res)) {
            pyes
            printv(res);
        } else pno
    }
    return 0;
}

Equal LIS CodeChef Solution in PYTH 3

# cook your dish here
# cook your dish here
for _ in range(int(input())):
    n=int(input())
    if(n%2):
        print("Yes")
        for i in range(1,n//2+1):
            print(i,end=" ")
        for i in range(n,(n//2),-1):
            print(i,end=" ")
        print()
    elif(n!=2):
        print("Yes")
        print(n//2,end=" ")
        for i in range(1,n//2):
            print(i,end=" ")
        for i in range(n,n//2,-1):
            print(i,end=" ")
        print()
    else:
        print("No")

Equal LIS CodeChef Solution in C

#include <stdio.h>

void solve()
{
    int k,i,m,l;
    scanf("%d",&k);
    if(k==2)
    printf("NO\n");
    else if(k%2==0)
    {
        l=k;
        m=1;
        printf("YES\n%d ",(k/2)+1);
        for(i=2;i<=k;i++)
        {
            if(i%2==0)
            {
                printf("%d ",m);
                m++;
            }
            else
            {
                printf("%d ",l);
                l--;
            }
        }
        printf("\n");
    }
    else
    {
         m=1;
         l=k;
        printf("YES\n");
        for(i=1;i<=k;i++)
        {
            if(i%2!=0)
            {
                 printf("%d ",m);
                 m++;
            }
            else
            {
                 printf("%d ",l);
                 l--;
            }
        }
        printf("\n");
        
    }
    
}

int main()
{
 int t;
 scanf("%d",&t);
 while(t--)
 {
     solve();
 }
 return 0;
}

Equal LIS CodeChef Solution in JAVA

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner sc=new Scanner(System.in);
	    int t=sc.nextInt();
	    for(int tt=0;tt<t;tt++){
	        int n=sc.nextInt();
	       
	        if(n==2){
	           System.out.println("NO");
	        }
	        else if(n%2==1){
	            System.out.println("YES");
	            for(int i=1;i<(n+1)/2;i++){
	                System.out.print(i+" ");
	            }
	            for(int i=n;i>=(n+1)/2;i--){
	                System.out.print(i+" ");
	            }
	        }
	        else if(n>2){
	            System.out.println("YES");
	            int[] a=new int[n];
	            for(int i=0;i<n/2;i++){
	                a[i]=i+1;
	            }
	            for(int i=n/2;i<n;i++){
	                a[i]=n-i+n/2;
	            }
	            a[0]=2;
	            a[1]=1;
	            for(int i:a){
	                System.out.print(i+" ");
	            }
	            System.out.println();
	        }
	    }
	}
}
    

Equal LIS CodeChef Solution in PYPY 3

def solve():
    n= int(input())
    if(n%2==0):
        if(n==2):
            print("NO")
        else :
            print("YES")
            print(2, end =" ")
            print(1, end =" ")
            for i in range (2, n//2 +1, 1):
                print(i*2, end =" ")
            for i in range(n-1, 2, -2):
                print(i, end =" ")
            print()
    else :
        print("YES")
        for i in range (1, (n+1)//2, 1):
            print(2*i, end =" ")
        for i in range (n, 0, -2):
            print(i, end =" ")
        print()

def main ():
    t=int(input())
    while(t>0):
        t=t-1
        solve()
# 	n,k = [int(x) for x in input().split()]
# 	arr = [int(x) for x in input().split()]
# 	Flipped( n,k ,arr)
	
if __name__ == "__main__": main ()

Equal LIS CodeChef Solution in C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace Codeforces
{
    public class Program
    {
        private static int _mod = (int)1e9 + 7;

        static void Main(string[] args)
        {
            //Precompute();
            int t = int.Parse(Console.ReadLine());
            for (int i = 0; i < t; i++)
                Solve();
        }

        public static List<int> _nums { get; set; }

        public static void Solve()
        {
            int n = GetInt();
            List<int> ans = new List<int>();
            if(n<=2)
            {
                Console.WriteLine("NO");
                return;
            }
            else if(n%2 == 0)
            {
                ans.AddRange(Enumerable.Range(n / 2 + 1, n / 2).Reverse());
                ans.AddRange(Enumerable.Range(1, n / 2));
                int a = ans[0];
                int b = ans[1];
                ans[0] = b;
                ans[1] = a;
            }
            else
            {
                ans.AddRange(Enumerable.Range((n+1)/2+1, n / 2).Reverse());
                ans.AddRange(Enumerable.Range(1, (n + 1) / 2));
            }

#if DEBUG
            Console.Write("Answer is -----------> ");
#endif
            Console.WriteLine("YES\n" + string.Join(" ",ans));
        }

        public static int DoubleIt(int n)
        {
            int b = 0;
            for(int i=15; i>=0; i--)
            {
                b *= 4;
                if ((n & (1 << i)) != 0)
                    b += 3;
            }
            return b;
        }

        public static int GetInt() => int.Parse(Console.ReadLine());
        public static long GetLong() => long.Parse(Console.ReadLine());

        public static int[] GetIntArray() => Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToArray();
        public static long[] GetLongArray() => Console.ReadLine().Trim().Split(' ').Select(long.Parse).ToArray();
        public static double[] GetDoublesArray() => Console.ReadLine().Trim().Split(' ').Select(d => Convert.ToDouble(d, CultureInfo.InvariantCulture)).ToArray();

        public static long Gcd(long a, long b) => b == 0 ? a : Gcd(b, a % b);
        public static long Gcd(long[] a) => a.Aggregate(a[0], (x, y) => Gcd(x, y));
        public static long Lcm(long a, long b) => a * b / Gcd(a, b);
        public static long Lcm(IEnumerable<int> a) => a.Aggregate(1L, (x, y) => Lcm(x, y));
        public static void Swap(ref long a, ref long b)
        {
            long t = a;
            a = b;
            b = t;
        }

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

        public static void OutputSequence(IEnumerable<long> x) => Console.WriteLine($" >>  " + string.Join(", ", x));

        public static string Rev(string s) => string.Concat(s.ToArray().Reverse());

        public static Dictionary<char, long> Frequencies(char[] a)
        {
            var ans = new Dictionary<char, long>();
            foreach (char k in a)
            {
                if (ans.ContainsKey(k))
                    ans[k]++;
                else
                    ans[k] = 1;
            }
            return ans;
        }
    }
}

Equal LIS 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--
		n := readNum(reader)
		res := solve(n)
		if len(res) == 0 {
			buf.WriteString("NO\n")
			continue
		}
		buf.WriteString("YES\n")
		for i := 0; i < n; i++ {
			buf.WriteString(fmt.Sprintf("%d ", res[i]))
		}
		buf.WriteByte('\n')
	}
	fmt.Println(buf.String())
}

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' {
			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
}

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 solve(n int) []int {
	if n == 2 {
		return nil
	}
	// else 始终可以  1, n, 2, n - 1, 3, n - 2, x
	res := make([]int, n)
	var a, b int
	if n%2 == 0 {
		res[0] = 2
		res[1] = 1
		a, b = n, 3
		for i := 2; i < n; i += 2 {
			res[i] = a
			a--
			if i+1 < n {
				res[i+1] = b
				b++
			}
		}
	} else {
		a, b = 1, n
		for i := 0; i < n; i += 2 {
			res[i] = a
			a++
			if i+1 < n {
				res[i+1] = b
				b--
			}
		}

	}

	return res
}
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