Submission #1151515

#	Time	Username	Problem	Language	Result	Execution time	Memory
1151515		tnt	Collecting Mushrooms (NOI18_collectmushrooms)	C++20	9 / 100	12 ms	8388 KiB

mushrooms

#include <bits/stdc++.h>
using namespace std;
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")

#define pb push_back                    
#define ll long long
#define all(v) v.begin(),v.end()

int mod = 1e8;
const int N = 1e6;
const int inf = 2e9;
int w1[2][N];
signed main(){
    //freopen("shuffle.in", "r", stdin);
    //freopen("shuffle.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int n,m,d,k;
    cin >> n >> m >> d >> k;
    char a[n + 1][m + 1];
    int w[n + 2][m + 2];
    w[0][0] = 0;
    vector <pair <int,int>> v;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> a[i][j];
            if(a[i][j] == 'S') v.pb({i,j});
            w[0][j] = w[i][0] = 0;
        }   
    }
    for(int i = 1; i <= n + 1; i++){
        for(int j = 1; j <= m + 1; j++){
            w[i][j] = 0;
        }
    }
        for(auto to : v){
            int x = to.first,y = to.second;
            w[max(1,x - d)][max(1,y - d)]++;
            w[min(n,x + d) + 1][max(1,y - d)]--;
            w[max(1,x - d)][min(m,y + d)]++;
            w[min(n,x + d) + 1][min(m,y + d)]--;
            
        }
        for(int j = 1; j <= m; j++){
            for(int i = 1; i <= n; i++){
                w[i][j] += w[i - 1][j];
            }
        }
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= m; j++){
                w[i][j] += w[i][j - 1];
            }
        }
        int ans = 0;
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= m; j++){
                if(a[i][j] == 'M' && w[i][j] >= k)ans++;
            }
        }
        cout << ans;
    
}

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