Submission #1106695

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106695		vjudge1	Collecting Mushrooms (NOI18_collectmushrooms)	C++17	60 / 100	76 ms	262144 KiB

mushrooms

#include <bits/stdc++.h>
#define sts(v) svble_sort(v.BE, v.E)
#define Rsts(v) svble_sort(v.rBE, v.rE)
#define rev(v) reverse(v.BE, v.E)
#define BE begin()
#define rBE rbegin()
#define E end()
#define rE rend()
#define pb push_back
#define ppb pop_back()
#define pf push_front
#define ppf pop_front()
#define F first
#define S second

using namespace std;
using ll = long long;

const int MAXN = 1e5 + 1;
const int MOD = 1e9 + 7;

int n, m, D, K;
vector<vector<int>> v;

pair<int, int> new_cord(int a, int b){
    if(a < 1 or a > (int)v.size() or b < 1 or b > (int)v[a].size())return {0, 0};
    else return {a, b};
}

int main(){
    ios_base::sync_with_stdio(0); 
    cin.tie(0); cout.tie(0);

    cin >> n >> m >> D >> K;
    vector<pair<int,int>> mushroom;
    v.resize(n + D + 1);
    for(int i = 0; i < (int)v.size(); i++)
        v[i].resize(m + D + 1);

    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++){
            char c; cin >> c;

            if(c == 'S')v[i][j] = 1;
            else if(c == 'M')mushroom.pb({i, j});
        }

    for(int i = 1; i <= n + D; i++)
        for(int j = 1; j <= m + D; j++)
            v[i][j] = v[i - 1][j] + v[i][j - 1] - v[i - 1][j - 1] + v[i][j];
    
    int cnt = 0;
    for(auto &i : mushroom){
        pair<int, int>  cor1 = new_cord(i.F + D, i.S + D), cor2 = new_cord(i.F - D - 1, i.S - D - 1),
                        cor3 = new_cord(i.F + D, i.S - D - 1), cor4 = new_cord(i.F - D - 1, i.S + D);
        
        if(K <= v[cor1.F][cor1.S] + v[cor2.F][cor2.S] - v[cor3.F][cor3.S] - v[cor4.F][cor4.S])cnt++;
    }

    cout << cnt << '\n';

    return 0;
}

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