Submission #651455

#	Time	Username	Problem	Language	Result	Execution time	Memory
651455		pauloamed	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	762 ms	159232 KiB

joi2019_ho_t1

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

#define int long long
const int MAXN = 3010;

char M[MAXN][MAXN];

int Os[MAXN][MAXN];
int Is[MAXN][MAXN];

int32_t main(){
  int h, w; cin >> h >> w;
  for(int i = 0; i < h; ++i){
    for(int j = 0; j < w; ++j){
      cin >> M[i][j];
    }
  }

  for(int i = 0; i < h; ++i){
    for(int j = w - 1; j >= 0; --j){
      Os[i][j] = (M[i][j] == 'O');
      if(j + 1 < w) Os[i][j] += Os[i][j + 1];
    }
  }

  for(int j = 0; j < w; j++){
    for(int i = h - 1; i >= 0; --i){
      Is[i][j] = (M[i][j] == 'I');
      if(i + 1 < h) Is[i][j] += Is[i + 1][j];
    }
  }

  int ans = 0;
  for(int i = 0; i < h; ++i){
    for(int j = 0; j < w; ++j){
      if(M[i][j] == 'J'){
        int x = Is[i][j] * Os[i][j];
        ans += x;
      }
    }
  }
  cout << ans << "\n";
}

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