Submission #305453

#	Time	Username	Problem	Language	Result	Execution time	Memory
305453		vipghn2003	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	378 ms	159100 KiB

joi2019_ho_t1

#include<bits/stdc++.h>

using namespace std;

const int N=3005;
int n,m,sRow[N][N][2],sCol[N][N][2];
char a[N][N];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cin>>a[i][j];
            for(int k=0;k<2;k++)
            {
                sRow[i][j][k]=sRow[i][j-1][k];
                sCol[i][j][k]=sCol[i-1][j][k];
            }
            if(a[i][j]=='O') sRow[i][j][0]++,sCol[i][j][0]++;
            if(a[i][j]=='I') sRow[i][j][1]++,sCol[i][j][1]++;
        }
    }
    long long res=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            if(a[i][j]!='J') continue;
            int numO=sRow[i][m][0]-sRow[i][j][0];
            int numI=sCol[n][j][1]-sCol[i][j][1];
            res+=1ll*numI*numO;
        }
    }
    cout<<res;
}

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