Submission #234429

#	Time	Username	Problem	Language	Result	Execution time	Memory
234429		bharat2002	Network (BOI15_net)	C++14	0 / 100	13 ms	12160 KiB

net

/*input
8
1 2
2 3
3 4
4 5
3 6
3 7
3 8
*/
#include<bits/stdc++.h>
using namespace std;
const int N=5e5 + 100;
const int mod=1e9 + 7;
#define int long long
const int inf=1e18;
#define pii pair<int, int>
#define f first
#define s second 
#define mp make_pair
#define FOR(i, n) for(int i=1;i<=n;i++)
#define TRACE(x) cerr << #x << " = " << x << endl 
//Trace prints the name of the variable and the value.
int n;vector<int> adjlist[N];vector<int> nodes;
signed main()
{
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
	cin>>n;
	for(int i=1;i<n;i++)
	{
		int a, b;cin>>a>>b;adjlist[a].push_back(b);adjlist[b].push_back(a);
	}
	for(int i=1;i<=n;i++)
	{
		if(adjlist[i].size()==1) nodes.push_back(i);
	}
	int ext=1;
	if(nodes.back()==ext) ext=n;
	int ans=nodes.size();
	if(ans%2==1) ans++;ans/=2;
	cout<<ans<<endl;
	for(int i=0;i<nodes.size()-1;i+=2)
	{
		cout<<nodes[i]<<" "<<nodes[i+1]<<endl;
	}
	ans=nodes.size();
	if(ans%2==1) cout<<ext<<" "<<nodes.back();
}

Compilation message (stderr)

net.cpp: In function 'int main()':
net.cpp:40:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(ans%2==1) ans++;ans/=2;
  ^~
net.cpp:40:21: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(ans%2==1) ans++;ans/=2;
                     ^~~
net.cpp:42:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<nodes.size()-1;i+=2)
              ~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 18
• Subtask 2: 0 / 45
• Subtask 3: 0 / 37