Submission #209193

#	Time	Username	Problem	Language	Result	Execution time	Memory
209193		mcdx9524	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	201 ms	13176 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());

const int N = 3e3 + 7;

char c[N][N];
ll res[N];

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  ll ans = 0;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> c[i][j];
    }
  }
  for (int i = 0; i < n; i++) {
    int cnt = 0;
    for (int j = m - 1; j >= 0; j--) {
      if (c[i][j] == 'O') {
        cnt++;
      }
      if (c[i][j] == 'J') {
        res[j] += cnt;
      }
      if (c[i][j] == 'I') {
        ans += res[j];
      }
    }
  }
  cout << ans << endl;
  return 0;
}

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