Submission #333503

#	Time	Username	Problem	Language	Result	Execution time	Memory
333503		fadi57	Collecting Mushrooms (NOI18_collectmushrooms)	C++14	100 / 100	50 ms	10604 KiB

mushrooms

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mx=2000;
const int mod= 998244353;
const ll inf=2*1e16+9;
int r,c,d,k;


int main() {
cin>>r>>c>>d>>k;
int a[r+6][c+8];

int pref[r+5][c+5];
    for(int i=0;i<=r;i++){

        for(int j=0;j<=c;j++){
                a[i][j]=pref[i][j]   =0;

            }
        }

    for(int i=1;i<=r;i++){

        for(int j=1;j<=c;j++){
                a[i][j]=pref[i][j]   =0;
                char x;cin>>x;
            if(x=='.'){
                a[i][j]=0;
            }else if(x=='M'){
            a[i][j]=1;
            }else{

 a[i][j]=2;
            }
        }
    }  for(int i=1;i<=r;i++){

        for(int j=1;j<=c;j++){

          if(a[i][j]==2){

                int uper=max(i-d,1);
          int left=max(j-d,1);
          // cout<<"hi"<<uper<<" "<<left<<endl;
          int right=j+d+1;
          int down=i+d+1;
            pref[max(i-d,1)][max(j-d,1)]++;
           pref[max(i-d,1)][min(j+d+1,c+1)]--;
              pref[min(down,r+1)][max(j-d,1)]--;
               pref[min(down,r+1)][min(j+d+1,c+1)]++;


          }
        }
    }
     for(int i=1;i<=r;i++){

        for(int j=1;j<=c;j++){
          pref[i][j]+=pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1];
            }
        }
        int ans=0;
        for(int i=1;i<=r;i++){

        for(int j=1;j<=c;j++){
      //  cout<<pref[i][j]<<" ";
        ans+=(pref[i][j]>=k&&a[i][j]==1);
        }
       // cout<<endl;
            }


cout<<ans;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int main()':
mushrooms.cpp:43:21: warning: unused variable 'uper' [-Wunused-variable]
   43 |                 int uper=max(i-d,1);
      |                     ^~~~
mushrooms.cpp:44:15: warning: unused variable 'left' [-Wunused-variable]
   44 |           int left=max(j-d,1);
      |               ^~~~
mushrooms.cpp:46:15: warning: unused variable 'right' [-Wunused-variable]
   46 |           int right=j+d+1;
      |               ^~~~~

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