Reversing the vowels

Given a string, reverse only the vowels present in it and print the resulting string.

Input: First line of the input file contains an integer T denoting the number of test cases. Then T test cases follow. Each test case has a single line containing a string.

Output: Corresponding to each test case, output the string with vowels reversed.

Example:

Input:
4
geeksforgeeks
practice
wannacry
ransomware

Output:
geeksforgeeks
prectica
wannacry
rensamwora

Your Code

#include<iostream>

using namespace std;

int main()

{

int t;

cin>>t;

while(t--)

{

string s;

cin>>s;

int l=s.length();

//cout<<l<<endl;

int i;

int b[100000];

int k=0;

for(i=0; i<l; i++)

{

if(s[i]=='a'||s[i]=='i'|| s[i]=='o'||s[i]=='e'||s[i]=='u')

{    

b[k]=i;

k++;

} 

}

if(k%2==0)

{

for(i=0; i<k/2; i++)

{   char temp=s[b[i]];

//cout<<s[b[i]];

s[b[i]]=s[b[k-i-1]];

s[b[k-i-1]]=temp;

}

 

 }

 else

 {

  for(i=0; i<=k/2; i++)

{

char temp=s[b[i]];

//cout<<temp;

s[b[i]]=s[b[k-i-1]];

s[b[k-i-1]]=temp;

}

 

 }

cout<<s<<endl;

}

}