Submission #944804

#	Time	Username	Problem	Language	Result	Execution time	Memory
944804		ezzzay	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	447 ms	159092 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e3+2;
char a[N][N];
int psi[N][N];
int pso[N][N];
signed main(){
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            pso[i][j]=pso[i][j-1];
            if(a[i][j]=='O')pso[i][j]++;
        }
    }
    for(int j=1;j<=m;j++){
        for(int i=1;i<=n;i++){
            psi[i][j]=psi[i-1][j];
            if(a[i][j]=='I')psi[i][j]++;
        }
    }
    int ans=0;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(a[i][j]=='J'){
               ans+= (pso[i][m]-pso[i][j])*(psi[n][j]-psi[i][j]); 
            }
        }
    }
    cout<<ans;
}

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