Submission #153345

#	Time	Username	Problem	Language	Result	Execution time	Memory
153345		AlexLuchianov	Collecting Mushrooms (NOI18_collectmushrooms)	C++14	100 / 100	65 ms	8236 KiB

mushrooms

#include <iostream>
#include <vector>

using namespace std;

#define ll long long
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

vector<vector<char>> v;
vector<vector<int>> sum;

int main()
{
  int n, m, d, k;
  cin >> n >> m >> d >> k;

  v.resize(2 + n);
  for(int i = 0; i <= n + 1; i++)
    v[i].resize(2 + m);
  sum.resize(2 + n);
  for(int i = 0; i <= n + 1; i++)
    sum[i].resize(2 + m);

  for(int i = 1;i <= n; i++)
    for(int j = 1;j <= m; j++) {
      cin >> v[i][j];
      if(v[i][j] == 'S'){
        int x = max(1, i - d);
        int y = max(1, j - d);
        int x2 = min(1 + n, 1 + i + d);
        int y2 = min(1 + m, 1 + j + d);
        sum[x][y]++;
        sum[x][y2]--;
        sum[x2][y]--;
        sum[x2][y2]++;
      }
    }

  for(int i = 1;i <= n; i++) {
    for(int j = 1;j <= m; j++) {
      sum[i][j] += sum[i - 1][j] + sum[i][j - 1] - sum[i - 1][j - 1];
    }
  }

  int result = 0;
  for(int i = 1;i <= n; i++)
    for(int j = 1; j <= m; j++)
      if(k <= sum[i][j] && v[i][j] == 'M')
        result++;
  cout << result;
  return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 23 / 23
• Subtask 5: 19 / 19
• Subtask 6: 21 / 21