Submission #711075

#	Time	Username	Problem	Language	Result	Execution time	Memory
711075		JJAnawat	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	153 ms	159420 KiB

joi2019_ho_t1

#include<bits/stdc++.h>

using namespace std;

int h,w;
string grid[3005];
long long qs1[3005][3005],qs2[3005][3005];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> h >> w;
    for(int i=1;i<=h;i++){
        string s;
        cin >> s;
        s=" "+s;
        grid[i]=s;
    }
    memset(qs1,0,sizeof(qs1));
    memset(qs2,0,sizeof(qs2));
    for(int i=1;i<=h;i++){
        for(int j=w;j>=1;j--){
            qs1[i][j]=qs1[i][j+1]+(grid[i][j]=='O');
        }
    }
    for(int i=h;i>=1;i--){
        for(int j=1;j<=w;j++){
            qs2[i][j]=qs2[i+1][j]+(grid[i][j]=='I');
        }
    }
    long long ans=0;
    for(int i=1;i<=h;i++){
        for(int j=1;j<=w;j++){
            if(grid[i][j]=='J'){
                ans+=qs1[i][j]*qs2[i][j];
            }
        }
    }
    cout << ans;
}

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