Submission #747503

#	Time	Username	Problem	Language	Result	Execution time	Memory
747503		tch1cherin	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	167 ms	89548 KiB

joi2019_ho_t1

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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int N, M;
  cin >> N >> M;
  vector<string> S(N);
  for (auto &v : S) {
    cin >> v;
  }
  vector row(N, vector<int>(M + 1)), col(M, vector<int>(N + 1));
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < M; j++) {
      row[i][j + 1] = row[i][j] + int(S[i][j] == 'O');
    }
  }
  for (int i = 0; i < M; i++) {
    for (int j = 0; j < N; j++) {
      col[i][j + 1] = col[i][j] + int(S[j][i] == 'I');
    }
  }
  long long ans = 0;
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < M; j++) {
      if (S[i][j] == 'J') {
        ans += (row[i][M] - row[i][j]) * (col[j][N] - col[j][i]);
      }
    }
  }
  cout << ans << "\n";
}

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