Submission #318357

#	Time	Username	Problem	Language	Result	Execution time	Memory
318357		georgerapeanu	Pastiri (COI20_pastiri)	C++11	0 / 100	517 ms	38740 KiB

pastiri

#include <bits/stdc++.h>

using namespace std;

const int NMAX = 500005;

int n,k;
vector<int> graph[NMAX + 5];
queue<int> q;

int dist[NMAX + 5];

int main(){

    scanf("%d %d",&n,&k);

    for(int i = 1;i < n;i++){
        int a,b;
        scanf("%d %d",&a,&b);
        graph[a].push_back(b);
        graph[b].push_back(a);
    }

    for(int i = 1;i <= k;i++){
        int nod;
        scanf("%d",&nod);
        q.push(nod);
        dist[nod] = 1;
    }

    vector<int> ans;

    while(q.empty() == false){
        int nod = q.front();
        q.pop();

        bool root = true;

        for(auto it:graph[nod]){
            if(dist[it] == 0){
                dist[it] = dist[nod] + 1;
                q.push(it);
                root = false;
            }
            else if(dist[it] == dist[nod] + 1){
                root = false;
            }
        }

        if(root){
            ans.push_back(nod);
        }
    }

    printf("%d\n",(int)ans.size());
    for(auto it:ans){
        printf("%d ",it);
    }

    return 0;
}

Compilation message (stderr)

pastiri.cpp: In function 'int main()':
pastiri.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |     scanf("%d %d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~~
pastiri.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |         scanf("%d %d",&a,&b);
      |         ~~~~~^~~~~~~~~~~~~~~
pastiri.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |         scanf("%d",&nod);
      |         ~~~~~^~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 18
• Subtask 3: 0 / 23
• Subtask 4: 0 / 51