Submission #1258733

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258733		nasufyro	Bitaro the Brave (JOI19_ho_t1)	C++20	20 / 100	3 ms	580 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll h, w;
    cin >> h >> w;
    vector<string> board(h);
    for(ll i = 0; i < h; i++){
        cin >> board[i];
    }
    ll ans=0;
    vector<ll> col(w, 0);
    vector<ll> suf(w, 0);
    for(ll i=0;i<h;i++)
    {
        for(ll j=0;j<w;j++)
        {
            if(board[i][j]=='I')
            {
                col[j]++;
            }
        }
    }
    for(ll i=0;i<h;i++)
    {
        for(ll j=0;j<w;j++)
        {
            if(board[i][j]=='I')
            {
                col[j]--;
            }
        }
        suf[w] = 0;
        for(ll j=w-1;j>=0;j--)
        {
            suf[j] = suf[j+1] + (board[i][j]=='O');
        }
        for(ll j=0;j<w;j++)
        {
            if(board[i][j]=='J')
            {
                ans += col[j] * suf[j+1];
            }
        }
    }
    cout<<ans;
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50