Reversals

#include <algorithm>
#include <iostream>
#include <string>
int main(){
	using namespace std;
	ios::sync_with_stdio(0);

	int n, m;
	cin >> n >> m;

	string word = "";

	getline(cin, word); //consume newline
	getline(cin, word);

	for(;m>0; m--){
		int a, b;
		cin >> a >> b;
		a--;
		b--;
		while(a < b){
			char temp = word[a];
			word[a] = word[b];
			word[b] = temp;
			a++;
			b--;
		}
	}
	cout << word << "\n";
	
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED