Submission #1034955

#	Time	Username	Problem	Language	Result	Execution time	Memory
1034955		sunboi	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	289 ms	159200 KiB

joi2019_ho_t1

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




signed main()
{
    int h, w; cin >> h >> w;
    vector<vector<char>> a(h, vector<char> (w));
    for (int i = 0; i < h; i++){
        string s; cin >> s;
        for (int j = 0; j < w; j++){
            a[i][j] = s[j];
        }
    }
    vector<vector<int>> col(h, vector<int> (w));
    vector<vector<int>> fil(h, vector<int> (w));
    
    for (int i = 0; i < h; i++){
        for (int j = 0; j < w; j++){
            if (j == 0) fil[i][j] += (a[i][j] == 'O');
            else {
                fil[i][j] = (a[i][j] == 'O');
                fil[i][j] += fil[i][j - 1];
            }
        }
    }
    for (int i = 0; i < w; i++){
        for (int j = 0; j < h; j++){
            if (j == 0)col[j][i] = (a[j][i] == 'I');
            else {
                col[j][i] = (a[j][i] == 'I');
                col[j][i] += col[j-1][i];
                
            }
        }
    }
   
    int ans = 0;
    for (int i = 0; i < h; i++){
        for (int j = 0; j < w; j++){
            if (a[i][j] == 'J') ans += (fil[i][w - 1] - fil[i][j]) * (col[h - 1][j] - col[i][j]);
        }
    }
    cout << ans << endl;
    
}

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