Submission #788245

#	Time	Username	Problem	Language	Result	Execution time	Memory
788245		12345678	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	131 ms	18252 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

const int nx=3e3+100;
long long h, w, dpr[nx], dpc[nx], ans;
char c[nx][nx];
vector<pair<int, int>> v;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>h>>w;
    for (int i=1; i<=h; i++) for (int j=1; j<=w; j++) cin>>c[i][j];
    for (int i=h; i>=1; i--)
    {
        for (int j=w; j>=1; j--)
        {
            if (c[i][j]=='J') ans+=dpc[j]*dpr[i];
            if (c[i][j]=='O') dpr[i]++;
            if (c[i][j]=='I') dpc[j]++;
        }
    }
    cout<<ans;
}

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