Submission #742680

#	Time	Username	Problem	Language	Result	Execution time	Memory
742680		riodsa	Collecting Mushrooms (NOI18_collectmushrooms)	C++17	9 / 100	22 ms	5652 KiB

mushrooms

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

#define pii pair<int,int>
int r,c,d,w;
const int N = 5e2+1;
char b[N][N];
int qs[N][N];
vector<pii> mush;

int main()
{
    cin >> r >> c >> d >> w;
    for(int i=1;i<=r;++i)
    {
        for(int j=1;j<=c;++j)
        {
            cin >> b[i][j];
            if(b[i][j] == 'S') qs[i][j] = 1;
            if(b[i][j] == 'M') mush.push_back({i,j});
        }
    }
    for(int i=1;i<=r;++i)
    {
        for(int j=1;j<=c;++j)
        {
            qs[i][j] += qs[i-1][j]+qs[i][j-1]-qs[i-1][j-1];
        }
    }
    int cnt = 0;
    for(auto [x,y] : mush)
    {
        int mx = min(r,x+d),mnx = max(1,x-d);
        int my = min(c,y+d),mny = max(1,y-d);
        int spring = qs[mx][my]-qs[mnx][my-1]-qs[mnx-1][my]+qs[mnx-1][mny-1];
        if(spring >= w) ++cnt;
    }
    cout << cnt;
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 10
• Subtask 3: 0 / 18
• Subtask 4: 0 / 23
• Subtask 5: 0 / 19
• Subtask 6: 0 / 21