Submission #7598410

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
using Int = long long;
int main() {
    string S; cin >> S;
    Int ans = 0;
    for (int i = 0; i < S.size(); i++) {
        Int n = 0;
        while (i + 1 < S.size() && S[i] == '2' && S[i + 1] == '5') {
            i += 2, n += 1;
        }
        ans += n * (n + 1) / 2;
    }
    cout << ans << '\n';
    return 0;
}

Submission Info

Judge Result