Submission #418248

#	Time	Username	Problem	Language	Result	Execution time	Memory
418248		jasmin	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	303 ms	151748 KiB

joi2019_ho_t1

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

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int h, w;
    cin >> h >> w;
    vector<string> stones(h);
    for(int i=0; i<h; i++){
        cin >> stones[i];
    }

    vector<vector<int> > orbs(h, vector<int> (w, 0));
    vector<vector<int> > ingos(h, vector<int> (w, 0));
    for(int i=0; i<h; i++){
        if(stones[i][w-1]=='O'){
            orbs[i][w-1]=1;
        }
        for(int j=w-2; j>=0; j--){
            orbs[i][j]=orbs[i][j+1]+(stones[i][j]=='O'? 1: 0);
        }
    }
    for(int j=0; j<w; j++){
        if(stones[h-1][j]=='I'){
            ingos[h-1][j]=1;
        }
        for(int i=h-2; i>=0; i--){
            ingos[i][j]=ingos[i+1][j]+(stones[i][j]=='I'? 1: 0);
        }
    }

    int ans=0;
    for(int i=0; i<h; i++){
        for(int j=0; j<w; j++){
            if(stones[i][j]=='J'){
                ans+=orbs[i][j]*ingos[i][j];
            }
        }
    }

    cout << ans << "\n";
}

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