Submission #1087237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087237		Tesla89	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	229 ms	160428 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long

using namespace std;

int sufw[3010][3010],sufh[3010][3010];

signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int h,w,res=0;
    cin>>h>>w;
    string a[h];
    for(int i=0;i<h;i++)cin>>a[i];
    for(int i=0;i<w;i++){
        for(int j=h-1;j>=0;j--){
            sufh[j][i]=sufh[j+1][i]+(a[j][i]=='I');
        }
    }
    for(int i=0;i<h;i++){
        for(int j=w-1;j>=0;j--){
            sufw[i][j]=sufw[i][j+1]+(a[i][j]=='O');
        }
    }
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(a[i][j]!='J')continue;
            res+=sufh[i][j]*sufw[i][j];
        }
    }
    cout<<res<<'\n';
    return 0;
}

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