Submission #544290

#	Time	Username	Problem	Language	Result	Execution time	Memory
544290		Jomnoi	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	88 ms	83396 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define DEBUG 0
using namespace std;

const int N = 3e3 + 10;

char S[N][N];
int qsi[N][N], qso[N][N];

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int H, W;
    cin >> H >> W;
    for(int i = 1; i <= H; i++) {
        cin >> (S[i] + 1);
    }
    
    for(int i = 1; i <= H; i++) {
        for(int j = 1; j <= W; j++) {
            qso[i][j] = qso[i][j - 1] + (S[i][j] == 'O');
            qsi[i][j] = qsi[i - 1][j] + (S[i][j] == 'I');
        }
    }

    long long ans = 0;
    for(int i = 1; i <= H; i++) {
        for(int j = 1; j <= W; j++) {
            ans += 1ll*(S[i][j] == 'J') * (qso[i][W] - qso[i][j]) * (qsi[H][j] - qsi[i][j]);
        }
    }
    cout << ans;
    return 0;
}

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