Reversals

#include <iostream>
#include <string>
#include <algorithm>    

int main()
{
  using namespace std;
  ios::sync_with_stdio(false);


  int n,m,a,b; string az;
  cin >> n >> m >> az;  


for (int i = 0; i<m; i++)
{
    //std::istringstream iss(az);
    cin >> a >> b;
    a -= 1; b-=1;
    for (int k = a, j = b; k < j; k++, j--)
    {
     //   c = az[k];
      //  az[k] = az[j];
      //  az[j] = c;
swap(az[k], az[j]);
    }
    

    //tmp = az[a-1];
    //az[a-1] = az[b-1];
    //az[b-1] = tmp;
     //cout << az << "\n";

}	
  cout << az;


return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED