Submission #364465

#	Time	Username	Problem	Language	Result	Execution time	Memory
364465		tushar_2658	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	475 ms	150392 KiB

joi2019_ho_t1

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

const int maxn = 3005;
using ll = long long;

char s[maxn][maxn];
ll pref[maxn][maxn], pref1[maxn][maxn];

int main(int argc, char const *argv[])
{
  ios::sync_with_stdio(false); 
  cin.tie(0);

  int n, m;
  cin >> n >> m;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= m; ++j){
      cin >> s[i][j];
    }
  }
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= m; ++j){
      pref[i][j] = pref[i][j - 1] + (s[i][j] == 'O');
    }
  }
  for(int i = 1; i <= m; ++i){
    for(int j = 1; j <= n; ++j){
      pref1[j][i] = pref1[j - 1][i] + (s[j][i] == 'I');
    }
  }
  ll ans = 0;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= m; ++j){
      if(s[i][j] == 'J'){
        ll x = (pref[i][m] - pref[i][j]) * (pref1[n][j] - pref1[i][j]);
        ans += x;
      }
    }
  }
  cout << ans << '\n';

  return 0;
}

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