Submission #109133

#	Time	Username	Problem	Language	Result	Execution time	Memory
109133		PeppaPig	Collecting Mushrooms (NOI18_collectmushrooms)	C++14	100 / 100	26 ms	13444 KiB

mushrooms

#include <bits/stdc++.h>

#define pii pair<int, int>
#define x first
#define y second

using namespace std;

const int N = 1e6+5;

int R, C, d, k, ans;
vector<pii> mush;

int main() {
    scanf("%d %d %d %d", &R, &C, &d, &k);
    vector<vector<int> > A(R+2, vector<int>(C+2));
    for(int i = 1; i <= R; i++) {
        char S[N];
        scanf(" %s", S+1);
        for(int j = 1; j <= C; j++) {
            if(S[j] == 'M') mush.emplace_back(i, j);
            else if(S[j] == 'S') {
                int tr = max(i - d, 1), tc = max(j - d, 1);
                int br = min(i + d + 1, R + 1), bc = min(j + d + 1, C + 1);
                ++A[tr][tc], --A[tr][bc], --A[br][tc], ++A[br][bc];
            }
        }
    }
    for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) A[i][j] += A[i-1][j] + A[i][j-1] - A[i-1][j-1];
    for(pii m : mush) if(A[m.x][m.y] >= k) ++ans;
    printf("%d\n", ans);

    return 0;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:15:10: 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:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %s", S+1);
         ~~~~~^~~~~~~~~~~~

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