Submission #1173964

#	Time	Username	Problem	Language	Result	Execution time	Memory
1173964		Ciprian	Collecting Mushrooms (NOI18_collectmushrooms)	C++20	37 / 100	2095 ms	15096 KiB

mushrooms

#include <bits/stdc++.h>
using namespace std;
#define int long long 
int d1[4]={0,0,1,-1};
int d2[4]={1,-1,0,0};
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n,m,d,k;
    cin>>n>>m>>d>>k;
    vector<vector<int>>wet(n+1, vector<int>(m+2));
    vector<vector<bool>>check(n+2, vector<bool>(m+2));
    vector<pair<int,int>>sprinkler, mush;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            char x;
            cin>>x;
            if(x=='S')sprinkler.push_back({i,j});
            if(x=='M')mush.push_back({i,j});
        }
    }for(auto e: sprinkler){
        int x=e.first, y=e.second;
        check.assign(n+2, vector<bool>(m+2));
        queue<pair<int,int>> q;
       // wet[x][y]++;
        //cout<<x<<" "<<y<<endl;
        q.push({x,y});
        while(!q.empty()){
            auto p=q.front();
            q.pop();
            if(check[p.first][p.second])continue;
            check[p.first][p.second]=true;
            wet[p.first][p.second]++;
            for(int i=0; i<4; i++){
                int xnou=d1[i]+p.first, ynou=d2[i]+p.second;
                if(xnou>0 && xnou<=n && ynou>0 && ynou<=m ){
                    if(!check[xnou][ynou] && max(abs(xnou-x), abs(ynou-y))<=d){
                        //cout<<xnou<<" "<<ynou<<" "<<max(abs(xnou-x), abs(ynou-y))<<endl;
                        
                        
                        q.push({xnou, ynou});
                    }
                }
            }
        }
        
    }int cnt=0;
    for(auto e: mush){
        //cout<<wet[e.first][e.second]<<endl;
        if(wet[e.first][e.second]>=k)cnt++;
    }cout<<cnt<<endl;
    
    return 0;
}

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