Submission #753895

#	Time	Username	Problem	Language	Result	Execution time	Memory
753895		emad234	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	365 ms	159416 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define all(v) ((v).begin(),(v).end())
#define ll long long
using namespace std;
const ll mod = 1e9 + 7;
const ll mxN = 2e6 + 1;
char a[3011][3011];
ll ing[3011][3011],orb[3011][3011];
signed main()
{
  ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  ll n,m;
  cin >>n>>m;
  for(ll i = 1;i <= n;i++){
    for(ll j = 1; j <= m;j++){
      cin >>a[i][j];
    }
  }
  for(ll j = 1;j <= m;j++){
    for(ll i = n;i;i--){
      ing[i][j] = ing[i + 1][j] + (a[i][j] == 'I');
    }
  }
  for(ll i = 1;i <= n;i++){
    for(ll j = m;j;j--){
      orb[i][j] = orb[i][j + 1] + (a[i][j] == 'O');
    }
  }
  ll ans = 0;
  for(ll i = 1;i<= n;i++){
    for(ll j = 1;j <= m;j++){
      if(a[i][j] == 'J'){
        ans += orb[i][j] * ing[i][j];
      }
    }
  }
  cout<<ans;
}

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