Submission #101734

#	Time	Username	Problem	Language	Result	Execution time	Memory
101734		DystoriaX	Collecting Mushrooms (NOI18_collectmushrooms)	C++14	100 / 100	58 ms	8316 KiB

mushrooms

#include <bits/stdc++.h>

using namespace std;

int r, c, d, k;
vector<vector<int> > pref;
vector<vector<char> > mp;

int main(){
	scanf("%d%d%d%d", &r, &c, &d, &k);

	pref.resize(r + 2);
	mp.resize(r + 2);
	for(int i = 0; i <= r + 1; i++) pref[i].assign(c + 2, 0), mp[i].resize(c + 2);

	for(int i = 1; i <= r; i++){
		for(int j = 1; j <= c; j++){
			scanf(" %c", &mp[i][j]);

			if(mp[i][j] == 'S'){
				int i1, i2, j1, j2;
				i1 = max(1, i - d); j1 = max(1, j - d);
				i2 = min(r + 1, i + d + 1); j2 = min(c + 1, j + d + 1);

				pref[i1][j1]++;
				pref[i1][j2]--;
				pref[i2][j1]--;
				pref[i2][j2]++;
			}
		}
	}

	int ans = 0;
	for(int i = 1; i <= r; i++){
		for(int j = 1; j <= c; j++){
			pref[i][j] += pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1];
			if(mp[i][j] == 'M') if(pref[i][j] >= k) ans++;
		}
	}

	printf("%d\n", ans);

	return 0;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &r, &c, &d, &k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
mushrooms.cpp:18:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf(" %c", &mp[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~~

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