This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mxN = 5e5 + 7;
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n;
string s;
cin >> n >> s;
int q;
cin >> q;
while (q--) {
int l, r;
cin >> l >> r;
--l, --r;
int ans = 0, c = 0, t = 0;
set<int> used;
for (int i = l; i <= r; ++i) {
if (s[i] == 'C') {
++c;
}
else {
++t;
}
if (t > c) {
t--;
++ans;
used.insert(i);
}
}
c = t = 0;
for (int i = r; i >= l; --i) {
if (s[i] == 'C') {
++c;
}
else if (!used.count(i)) {
++t;
}
if (t > c) {
t--;
++ans;
}
}
cout << ans << "\n";
}
}
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