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1451B.cpp
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//🎃🎃🎃😎😎😁🤓☣☣☣☣☣dark_coder☣☣☣☣☣😎😎😁🤓🎃🎃🎃
#include <bits/stdc++.h>
using namespace std;
#define IOS \
ios::sync_with_stdio(0); \
cin.tie(0); \
cout.tie(0);
#define all(x) (x).begin(), (x).end()
#define li long long int
#define pi pair<int, int>
int main()
{
IOS int t;
cin >> t;
while (t--)
{
int n, q;
cin >> n >> q;
string s;
cin >> s;
for (int i = 0; i < q; i++)
{
pi p;
cin >> p.first >> p.second;
int flag=0;
for (int i = p.second; i < n; i++)
{
if(s[i]==s[p.second-1])flag=1;
}
for (int i = 0; i < p.first-1; i++)
{
if(s[i]==s[p.first-1])flag=1;
}
if(flag)cout<<"YES";
else cout<<"NO";
cout << endl;
}
}
return 0;
}