Submission #1037340

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037340		vanea	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	86 ms	89684 KiB

joi2019_ho_t1

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

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int h, w;
    cin >> h >> w;
    vector<string> v(h+1);
    vector<vector<int>> prefI(h+1, vector<int>(w+1)), prefO(h+1, vector<int>(w+1));
    for(int i = 1; i <= h; i++) {
        cin >> v[i];
    }
    for(int i = 1; i <= h; i++) {
        for(int j = 1; j <= w; j++) {
            prefO[i][j] = prefO[i][j-1]+(v[i][j-1] == 'O');
            prefI[i][j] = prefI[i-1][j]+(v[i][j-1] == 'I');
        }
    }
    ll ans = 0;
    for(int i = 1; i <= h; i++) {
        for(int j = 1; j <= w; j++) {
            if(v[i][j-1] == 'J') {
                ll curr = prefO[i][w]-prefO[i][j];
                curr *= prefI[h][j]-prefI[i][j];
                ans += curr;
            }
        }
    }
    cout << ans;
    return 0;
}

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