Submission #109131

#	Time	Username	Problem	Language	Result	Execution time	Memory
109131		PeppaPig	Collecting Mushrooms (NOI18_collectmushrooms)	C++14	60 / 100	8 ms	2048 KiB

mushrooms

#include <bits/stdc++.h>

using namespace std;

const int N = 1e6+5;

int R, C, d, k;
int A[N], ans;
vector<int> mush;

int get(int r, int c) { return r*C + c; }

int main() {
    scanf("%d %d %d %d", &R, &C, &d, &k);
    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(get(i, j));
            else if(S[j] == 'S') {
                ++A[get(max(1, i-d), max(1, j-d))];
                --A[get(min(R+1, i+d+1), max(1, j-d))];
                --A[get(max(1, i-d), min(C+1, j+d+1))];
                ++A[get(min(R+1, i+d+1), min(C+1, j+d+1))];
            }
        }
    }
    for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) 
        A[get(i, j)] += A[get(i-1, j)] + A[get(i, j-1)] - A[get(i-1, j-1)];
    for(int m : mush) if(A[m] >= k) ++ans;
    printf("%d\n", ans);

    return 0;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:14:10: 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:17:14: 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: 0 / 19
• Subtask 6: 0 / 21