Submission #714483

#	Time	Username	Problem	Language	Result	Execution time	Memory
714483		Ninedesu	Bitaro the Brave (JOI19_ho_t1)	C++14	20 / 100	8 ms	6868 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;

const int N=3001;
int n,m;
int cnt;
int sumO[N][N],sumI[N][N];
bool vis[N][N];
string arr[N],s;

int main(){
  ios_base::sync_with_stdio(0),cin.tie(0);
  int n,m;
  cin >> n >> m;
  for(int y=1; y<=n; y++){
    cin >> s;
    arr[y]="x"+s;
  }
  for(int i=1; i<=n; i++){
    for(int j=m; j>=1; j--){
      sumO[i][j]+=sumO[i][j+1];
      if(arr[i][j]=='O')sumO[i][j]++;
    }
  }
  for(int j=1; j<=m; j++){
    for(int i=n; i>=1; i--){
      sumI[i][j]+=sumI[i+1][j];
      if(arr[i][j]=='I')sumI[i][j]++;
    }
  }
  for(int i=1; i<=n; i++){
    for(int j=1; j<=m; j++){
      if(arr[i][j]=='J'){
        cnt+=sumO[i][j]*sumI[i][j];
      }
    }
  }
  cout << cnt;

  return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50