Submission #1135600

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135600		Hamed_Ghaffari	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	132 ms	79644 KiB

joi2019_ho_t1

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

const int MXN = 3003;

int h, w;
char a[MXN][MXN];
int I[MXN][MXN], O[MXN][MXN];

int32_t main() {
  cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  cin >> h >> w;
  for(int i=1; i<=h; i++)
    for(int j=1; j<=w; j++)
      cin >> a[i][j];
  long long ans = 0;
  for(int i=h; i>=1; i--)
    for(int j=w; j>=1; j--) {
      I[i][j] = (i+1<=h ? I[i+1][j] : 0) + (a[i][j]=='I');
      O[i][j] = (j+1<=w ? O[i][j+1] : 0) + (a[i][j]=='O');
      if(a[i][j]=='J')
        ans += I[i][j]*O[i][j];
    }
  cout << ans << '\n';
  return 0;
}

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