Submission #774383

#	Time	Username	Problem	Language	Result	Execution time	Memory
774383		kirakaminski968	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	200 ms	89528 KiB

joi2019_ho_t1

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

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int H,W; cin >> H >> W;
    vector<string> grid(H);
    for(int i = 0;i<H;++i) cin >> grid[i];
    vector<vector<int>> cntorbs(H,vector<int>(W,0)),cntingots(H,vector<int>(W,0));
    for(int i = 0;i<H;++i){
        int cnt = 0;
        for(int j = W-1;j>=0;--j){
            if(grid[i][j] == 'O') cnt++;
            cntorbs[i][j] = cnt;
        }
    }
    for(int i = 0;i<W;++i){
        int cnt = 0;
        for(int j = H-1;j>=0;--j){
            if(grid[j][i] == 'I') cnt++;
            cntingots[j][i] = cnt;
        }
    }
    ll ans = 0;
    for(int i = 0;i<H;++i){
        for(int j = 0;j<W;++j){
            if(grid[i][j] == 'J') ans += cntorbs[i][j]*cntingots[i][j];
        }
    }
    cout << ans << "\n";
    return 0;
}

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