Submission #1326523

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326523		lunarecho	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	174 ms	44680 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define F first
#define S second

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int h, w;
    cin>>h>>w;
    vector<vector<char>> g(h, vector<char>(w));
    vector<vector<int>> p(w, vector<int>(h, 0));
    for(int i=0;i<h;++i) {
        for(int j=0;j<w;++j) {
            cin>>g[i][j];
            p[j][i] += (i > 0 ? p[j][i - 1] : 0);
            p[j][i] += (g[i][j] == 'I');
        }
    }
    ll cnt = 0;
    for(int i=0;i<h;++i) {
        vector<int> p2(w, 0);
        for(int j=w-1;j>=0;--j) {
            p2[j] += (j != w - 1 ? p2[j + 1] : 0);
            p2[j] += (g[i][j] == 'O');
            if(g[i][j] == 'J') {
                ll x = p[j][h - 1] - p[j][i], y = p2[j];
                cnt += (x * y);
            }
        }
    }  
    cout<<cnt<<'\n';

    return 0;
}

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