Submission #1158366

#	Time	Username	Problem	Language	Result	Execution time	Memory
1158366		crispxx	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	96 ms	80964 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

#define nl '\n'

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int H, W; cin >> H >> W;
	
	vector<string> s(H);
	
	for(auto &row : s) cin >> row;
	
	vector<vector<int>> I(H + 1, vector<int>(W + 1)), O(H + 1, vector<int>(W + 1));
	
	for(int i = H - 1; i >= 0; i--) {
		for(int j = W - 1; j >= 0; j--) {
			I[i][j] = I[i + 1][j] + (s[i][j] == 'I');
			O[i][j] = O[i][j + 1] + (s[i][j] == 'O');
		}
	}
	
	long long ans = 0;
	
	for(int i = 0; i < H; i++) {
		for(int j = 0; j < W; j++) {
			if(s[i][j] == 'J') {
				ans += I[i][j] * 1LL * O[i][j];
			}
		}
	}
	
	cout << ans << nl;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50