Submission #1352227

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Source Code Expand

#include<stdio.h>
#include<string.h>
#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<functional>
#define int long long
using namespace std;

signed main() {
	string a; cin >> a;
	int ans = 0;
	for (int i = 0; i < a.length(); i++) {
		if (a[i] != '2')continue;
		int j = i + 1;
		for (; j < a.length(); j++) {
			if ((a[j - 1] == '5'&&a[j] == '2') || (a[j - 1] == '2'&&a[j] == '5'))continue;
			break;
		}
		int sum = j - i;
		sum /= 2;
		ans += sum*(sum + 1) / 2;
		i = j;
	}
	cout << ans << endl;
}

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