Submission #436538

#	Time	Username	Problem	Language	Result	Execution time	Memory
436538		dariasc	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	541 ms	88320 KiB

joi2019_ho_t1

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

int main() {
    int h, w;
    cin >> h >> w;
    char grid[h][w];
    for (int i = 0; i < h; i++) {
        string s;
        cin >> s;
        for (int j = 0; j < w; j++) {
            grid[i][j] = s[j];
        }
    }

    int orbs[h][w];
    for (int i = 0; i < h; i++) {
        orbs[i][w-1] = grid[i][w-1] == 'O';
        for (int j = w-2; j >= 0; j--) {
            orbs[i][j] = orbs[i][j+1] + (grid[i][j] == 'O');
        }
    }
    int ingots[h][w];
    for (int j = 0; j < w; j++) {
        ingots[h-1][j] = grid[h-1][j] == 'I';
        for (int i = h-2; i >= 0; i--) {
            ingots[i][j] = ingots[i+1][j] + (grid[i][j] == 'I');
        }
    }

    long long ans = 0;
    for (int i = 0; i < h-1; i++) {
        for (int j = 0; j < w-1; j++) {
            if (grid[i][j] != 'J') {
                continue;
            }
            ans += ingots[i+1][j] * orbs[i][j+1];
        }
    }
    cout << ans << endl;
    return 0;
}

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