Submission #1197998

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197998		apelpisia	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	189 ms	151308 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long

using namespace std;

const int nx =3005;
string grid[nx];
int h, w, qso[nx][nx], qsi[nx][nx], ans = 0;

signed main(){
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> h >> w;
    for(int i=1; i<=h; i++){
        cin >> grid[i];
        for(int j=0; j<w; j++){
            if(grid[i][j]=='O'){
                // cout << "O\n";
                qso[i][j+1]++;
            } else if(grid[i][j]=='I'){
                // cout << "I\n";
                qsi[i][j+1]++;
            }
            qso[i][j+1]+=qso[i][j];
            qsi[i][j+1]+=qsi[i-1][j+1];
        }
    }
    for(int i=1; i<=h; i++){
        for(int j=0; j<w; j++){
            if(grid[i][j]=='J'){
                ans+=((qso[i][w] - qso[i][j+1])*(qsi[h][j+1] - qsi[i][j+1]));
                // cout << "i = " << i << " j = " << j+1 << "\n";
                // cout << qso[i][w] << ' ' << qso[i][j+1] << ' ' << qsi[h][j+1] << ' ' << qsi[i][j+1] << "\n";
            }
        }
    }
    cout << ans;
    // for(int i=1; i<=h; i++){
    //     for(int j=1; j<=w; j++) cout << qso[i][j] << ' ';
    //     cout << "\n";
    // }
    // cout << "----------------------------\n";
    // for(int i=1; i<=h; i++){
    //     for(int j=1; j<=w; j++) cout << qsi[i][j] << ' ';
    //     cout << "\n";
    // }

    return 0;
}

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