Submission #8,400

2024-01-15 15:36:30

cpp17

Accepted 75/75

6ms

5996 KiB

// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	string s;
	cin >> n >> s;
	vector<int> tcount(n), nextg(n);
	int t = 0, g = -1;
	long long ans = 0;
	for (int i = n - 1; i >= 0; i--) {
		tcount[i] = t;
		nextg[i] = g;
		if (s[i] == 'G') g = i;
		if (s[i] == 'T') t++;
		if (s[i] == 'A' && nextg[i] != -1) {
			ans += tcount[nextg[i]];
		}
	}
	cout << ans << endl;
}

	Sum	Test	Verdict		Time	Memory
base	75/75
		1	Accepted	0/0	3ms	1816 KiB
		2	Accepted	0/0	6ms	3880 KiB
		3	Accepted	3/3	3ms	2212 KiB
		4	Accepted	4/4	3ms	2300 KiB
		5	Accepted	4/4	3ms	2424 KiB
		6	Accepted	4/4	3ms	2636 KiB
		7	Accepted	4/4	3ms	2848 KiB
		8	Accepted	3/3	3ms	3060 KiB
		9	Accepted	3/3	3ms	3152 KiB
		10	Accepted	4/4	3ms	3296 KiB
		11	Accepted	4/4	3ms	3208 KiB
		12	Accepted	4/4	3ms	3188 KiB
		13	Accepted	4/4	3ms	3316 KiB
		14	Accepted	4/4	3ms	3428 KiB
		15	Accepted	3/3	6ms	5160 KiB
		16	Accepted	4/4	6ms	5136 KiB
		17	Accepted	4/4	6ms	5388 KiB
		18	Accepted	4/4	6ms	5476 KiB
		19	Accepted	4/4	6ms	5664 KiB
		20	Accepted	4/4	6ms	5880 KiB
		21	Accepted	3/3	6ms	5996 KiB
		22	Accepted	4/4	6ms	5980 KiB