이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define X first
#define Y second
int n,a,b,id[500005],root,num,a1,b1,a2,b2;
vector<int> v[500005],leaf;
vector<pair<int,int> > ans;
void dfs(int u,int p)
{
for(auto node:v[u])
{
if(node==p)continue;
dfs(node,u);
}
if(v[u].size()==1)leaf.pb(u);
}
int main()
{
cin>> n;
for(int i=1;i<n;i++)
{
cin >> a >> b;
++id[a],++id[b];
v[a].pb(b);
v[b].pb(a);
}
for(int i=1;i<=n;i++)
{
if(id[i]>1)
{
root=i;
break;
}
}
for(auto node:v[root])
{
num=node;
dfs(node,root);
}
if(leaf.size()%2==0)
{
for(int i=0;i<leaf.size()/2;i++)
{
ans.pb({leaf[i],leaf[i+leaf.size()/2]});
}
}else
{
for(int i=0;i<leaf.size()/2;i++)
{
ans.pb({leaf[i],leaf[i+leaf.size()/2+1]});
}
ans.pb({leaf[leaf.size()/2],root});
}
printf("%d\n",ans.size());
for(auto [x,y]:ans)
{
printf("%d %d\n",x,y);
}
}
컴파일 시 표준 에러 (stderr) 메시지
net.cpp: In function 'int main()':
net.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
43 | for(int i=0;i<leaf.size()/2;i++)
| ~^~~~~~~~~~~~~~
net.cpp:49:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
49 | for(int i=0;i<leaf.size()/2;i++)
| ~^~~~~~~~~~~~~~
net.cpp:55:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wformat=]
55 | printf("%d\n",ans.size());
| ~^ ~~~~~~~~~~
| | |
| int std::vector<std::pair<int, int> >::size_type {aka long unsigned int}
| %ld
net.cpp:56:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
56 | for(auto [x,y]:ans)
| ^
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