# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
330589 | 2020-11-25T21:13:29 Z | Sho10 | Network (BOI15_net) | C++14 | 4 ms | 4992 KB |
#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10 #define ll long long #define double long double #pragma GCC optimize("O3") #pragma GCC optimize("Ofast") #define all(a) (a).begin(), (a).end() #define f first #define s second #define pb push_back #define mp make_pair #define pi pair #define rc(s) return cout<<s,0 #define endl '\n' #define mod (10*10*10*10*10*10*10*10*10+7) #define PI 3.14159265359 #define MAXN 100005 #define INF 1000000005 #define LINF 1000000000000000005ll #define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0); using namespace std; ll n; vector<ll>g[200005]; vector<ll>leaf; void dfs(ll node,ll par){ ll cnt=0; for(auto it : g[node]){ if(it==par){ continue; }else { cnt++; dfs(it,node); } } if(cnt==0){ leaf.pb(node); } } int32_t main(){ CODE_START; cin>>n; for(ll i=1;i<=n-1;i++) { ll x,y; cin>>x>>y; g[x].pb(y); g[y].pb(x); } dfs(1,0); ll nr=0; for(ll i=1;i<=n;i++) { if(g[i].size()>=2){ nr=i; break; } } if(g[1].size()==1){ leaf.pb(1); } cout<<(leaf.size()+1)/2<<endl; for(ll i=0;i<leaf.size();i+=2){ if(i+1<leaf.size()) cout<<leaf[i]<<' '<<leaf[i+1]<<endl; } if(leaf.size()%2) cout<<leaf[leaf.size()-1]<<' '<<nr<<endl; }
Compilation message
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 4 ms | 4992 KB | Output is correct |
2 | Incorrect | 3 ms | 4972 KB | Breaking single line is causing network to disconnect. |
3 | Halted | 0 ms | 0 KB | - |
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 4 ms | 4992 KB | Output is correct |
2 | Incorrect | 3 ms | 4972 KB | Breaking single line is causing network to disconnect. |
3 | Halted | 0 ms | 0 KB | - |
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 4 ms | 4992 KB | Output is correct |
2 | Incorrect | 3 ms | 4972 KB | Breaking single line is causing network to disconnect. |
3 | Halted | 0 ms | 0 KB | - |