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# Transform the Expression CodeChef Solution

## Problem – Transform the Expression CodeChef Solution

Reverse Polish Notation (RPN) is a mathematical notation where every operator follows all of its operands. For instance, to add three and four, one would write “3 4 +” rather than “3 + 4”. If there are multiple operations, the operator is given immediately after its second operand; so the expression written “3 − 4 + 5” would be written “3 4 − 5 +” first subtract 4 from 3, then add 5 to that.

Transform the algebraic expression with brackets into RPN form.

You can assume that for the test cases below only single letters will be used, brackets [] will not be used and each expression has only one RPN form (no expressions like a*b*c)

### Input

The first line contains t, the number of test cases (less then 100).

Followed by t lines, containing an expression to be translated to RPN form, where the length of the expression is less then 400.

### Output

```The expressions in RPN form, one per line.
```

### Example

```Input:
3
(a+(b*c))
((a+b)*(z+x))
((a+t)*((b+(a+c))^(c+d)))

Output:
abc*+
ab+zx+*
at+bac++cd+^*
```

## Transform the Expression CodeChef Solution in C++14

``````#include <iostream>
using namespace std;

int main() {
int t;
cin>>t;

int top=-1;
while(t--){

string a;
cin>>a;
char s;
for(int i=0;i<a.length();i++){
if(a[i]>='a' && a[i]<='z'){
cout<<a[i];
}
else if(a[i]==')'){
cout<<s[top];
top--;
}
else if(a[i]!='('){
top++;
s[top]=a[i];
}
}
cout<<endl;
}
return 0;
}
``````

## Transform the Expression CodeChef Solution in Pyth 3

``````# cook your dish here
t=int(input())
while(t>0):
s=input()
a="+-*%^/!"
b=[]
for i in s:
if i in a:
b.append(i)
elif(i==')'):
print(b.pop(),end="")
elif(i!='('):
print(i,end="")
print()
t=t-1``````

## Transform the Expression 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 sca=new Scanner(System.in);
int T=sca.nextInt();

while(T-->0){
String str=sca.next();
Stack<Character> s=new Stack();
String r="";

for(int i=0;i<str.length();i++){
char c=str.charAt(i);

if(c=='+'||c=='-'||c=='*'||c=='/'||c=='('||c=='^'){
s.push(c);
}

else if(c==')'){
while(s.peek()!='('){
r+=s.pop();
}
s.pop();
}

else{
r+=c;
}
}
System.out.println(r);
}
}
}``````
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