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Submission #305436

# Submission time Handle Problem Language Result Execution time Memory
305436 2020-09-23T06:26:20 Z shahriarkhan Network (BOI15_net) C++14
0 / 100
 1 ms 384 KB 
#include<bits/stdc++.h>
using namespace std ;

int main()
{
    int n ;
    scanf("%d",&n) ;
    int deg[n+1] = {0} ;
    for(int i = 1 ; i < n ; ++i)
    {
        int u , v ;
        scanf("%d%d",&u,&v) ;
        ++deg[u] , ++deg[v] ;
    }
    vector<int> ans ;
    for(int i = 1 ; i <= n ; ++i)
    {
        if(deg[i]==1) ans.push_back(i) ;
    }
    int p = ans.size() ;
    printf("%d\n",(p+1)/2) ;
    if(p%2)
    {
        printf("%d %d\n",ans[p-1],ans[p-2]) ;
        --p ;
    }
    for(int i = 0 ; i < p ; i += 2)
    {
        printf("%d %d\n",ans[i],ans[i+1]) ;
    }
    return 0 ;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |     scanf("%d",&n) ;
      |     ~~~~~^~~~~~~~~
net.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |         scanf("%d%d",&u,&v) ;
      |         ~~~~~^~~~~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Incorrect 0 ms 256 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Incorrect 0 ms 256 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Incorrect 0 ms 256 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -