Submission #652831

#	Time	Username	Problem	Language	Result	Execution time	Memory
652831		Shin	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	230 ms	17996 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair

using namespace std;
template <class X, class Y> bool minimize(X &a, Y b) {
    if (a > b) return a = b, true;
    return false;
}
template <class X, class Y> bool maximize(X &a, Y b) {
    if (a < b) return a = b, true;
    return false;
}

const int N = 3e3 + 7;
char a[N][N];
int cnt[N];

signed main() {
  cin.tie(0)->sync_with_stdio(0);
  int n, m; cin >> n >> m;
  for (int i = 1; i <= n; i ++) {
    for (int j = 1; j <= m; j ++) {
      cin >> a[i][j];
    }
  }
  long long res = 0;
  for (int i = n; i > 0; i --) {
    int cnt_o = 0;
    for (int j = m; j > 0; j --) {
      if (a[i][j] == 'J') {
        res += 1LL * cnt_o * cnt[j];
      }
      if (a[i][j] == 'O') {
        cnt_o ++;
      }
      if (a[i][j] == 'I') {
        cnt[j] ++;
      }
    }
  }
  cout << res;
  return 0;
}

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