제출 #1290206

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1290206		haha	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	165 ms	79676 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define f first
#define s second
#define ll long long
using namespace std;
const int maxn=3e3+5;

int n,m;
char c[maxn][maxn];
int cnt_o[maxn][maxn],cnt_i[maxn][maxn];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>c[i][j];
            cnt_o[i][j]=cnt_o[i][j-1]+(c[i][j]=='O');
        }
    }
    for(int j=1;j<=m;j++){
        for(int i=1;i<=n;i++){
            cnt_i[j][i]=cnt_i[j][i-1]+(c[i][j]=='I');
        }
    }
    ll ans=0;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(c[i][j]=='J'){
                int x=cnt_o[i][m]-cnt_o[i][j];
                int y=cnt_i[j][n]-cnt_i[j][i];
                ans+=1LL*x*y;
            }
        }
    }
    cout<<ans;
}

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