Submission #451974

#	Time	Username	Problem	Language	Result	Execution time	Memory
451974		fadi57	Cat in a tree (BOI17_catinatree)	C++14	0 / 100	13 ms	23756 KiB

catinatree

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
const int mx=1e6+10;
typedef long long ll;
const int mod=1e9+7;
const int MXm=22;
#define F first
#define S second
const int inf=1e9+10;
vector<int>adj[mx];
 int n,d,ans;
  void dfs(int node,int depth,int par){

       if(depth==0){
        ans++;
        depth=d-1;
       }
      // cout<<node<<" "<<depth<<" "<<endl;
     depth--;
     for(auto it:adj[node]){
        if(it==par){
            continue;
        }
        dfs(it,depth,node);
     }
  return;

  }


 int main(){

      cin>>n>>d;
      for(int i=1;i<n;i++){

        int x;
        cin>>x;
        adj[i].push_back(x);
        adj[x].push_back(i);
      }int s;

        for(int i=0;i<n;i++){



       if(adj[i].size()==1){
        s=i;
       }
      }
      dfs(s,d,-1);
      if(ans==0){
        ans=-1;
      }
  cout<<ans+1;
        }

Compilation message (stderr)

catinatree.cpp: In function 'int main()':
catinatree.cpp:52:10: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |       dfs(s,d,-1);
      |       ~~~^~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 40
• Subtask 3: 0 / 49