Submission #261369

#	Time	Username	Problem	Language	Result	Execution time	Memory
261369		SpeedOfMagic	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	180 ms	151624 KiB

joi2019_ho_t1

#include "bits/stdc++.h"

using namespace std;

#define int long long

signed main() {
	ios::sync_with_stdio(0); cin.tie();
	int h, w;
	cin >> h >> w;
	vector<string> s(h);
	for (int i = 0; i < h; ++i)
		cin >> s[i];
	vector<vector<int>> cnt_o(h, vector<int>(w, 0));
	vector<vector<int>> cnt_i(h, vector<int>(w, 0));

	for (int i = h - 1; i >= 0; --i) {
		for (int j = 0; j < w; ++j) {
			cnt_i[i][j] = ((i + 1 < h) ? cnt_i[i + 1][j] : 0) + (s[i][j] == 'I');
		}
	}

	for (int i = 0; i < h; ++i) {
		for (int j = w - 1; j >= 0; --j) {
			cnt_o[i][j] = ((j + 1 < w) ? cnt_o[i][j + 1] : 0) + (s[i][j] == 'O');
		}
	}
	int ans = 0;
	for (int i = 0; i < h; ++i) {
		for (int j = 0; j < w; ++j) {
			ans += (s[i][j] == 'J') * cnt_i[i][j] * cnt_o[i][j];
		}
	}
	cout << ans;
}

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