Submission #1118083

#	Time	Username	Problem	Language	Result	Execution time	Memory
1118083		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	20 / 100	1048 ms	848 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define F first
#define S second
#define LL long long
 
#define rep(i, x) for(auto &i : (x))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
 
#define left(x) ((x)<<1)
#define right(x) ((x)>>1)
#define LSOne(x) (x & -(x))
 
using namespace std;
using T = pair<pair<int, int>, int>;
 
const int SZ = 2e5 + 1;
const LL MOD = 1e9 + 7; 
const LL INF = 1e18 + 1;
 
LL bp (LL b, LL e, LL m = MOD) {
 if ( e == 0 ) return 1;
 LL T = bp(b, e / 2);
 T *= T; T %= m;
 if ( e & 1 ) T *= b;
 return T %= m;
}
 
LL nv_i (LL a) { return bp(a, MOD - 2); };
LL gcd (LL a, LL b) { return (b == 0 ? a : gcd(b, a % b)); }
LL lcm(LL a, LL b) { return (a * (b / gcd(a, b))); }
LL ceil (LL a, LL b) { return ((a + b - 1) / b); }
 
void solve() {
  int n, m;
  cin >> n >> m;

  set<int> I_1, J_1, I_2, J_2;
  vector<vector<char>> MC(n + 1, vector<char> (m + 1));

  for(int i = 1; i <= n; i ++) {
    for(int j = 1; j <= m; j ++) {
      char x;
      cin >> x;
      MC[i][j] = x;

      if(x == 'J') {
        I_1.insert(i);
        J_1.insert(j);
      }
    }
  }

  rep(i_1, I_1) {
    for(int i = 1; i <= m; i ++) {
      if(MC[i_1][i] == 'O') {
        J_2.insert(i);
      }
    }
  }

  rep(j_1, J_1) {
    for(int i = 1; i <= n; i ++) {
      if(MC[i][j_1] == 'I') {
        I_2.insert(i);
      }
    }
  }

  int cnt = 0;
  rep(i_1, I_1) {
    rep(j_1, J_1) {
      rep(i_2, I_2) {
        rep(j_2, J_2) {
          if(i_1 > i_2 || j_1 > j_2) continue;
          if(MC[i_1][j_1] == 'J' && MC[i_1][j_2] == 'O' && MC[i_2][j_1] == 'I') {
            cnt ++;
          }
        }
      }
    }
  }

  cout << cnt;
}
 
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
 
  solve();
  return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50