# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
106886 | 2019-04-20T20:19:55 Z | Pajaraja | Network (BOI15_net) | C++17 | 45 ms | 44160 KB |
#include <bits/stdc++.h> using namespace std; int cnt,nes; vector<int> g[500007],d[500007]; vector<bool> v[500007]; int k[500007]; void dfs(int s,int f) { if(g[s].size()==1) { k[cnt++]=s; return; } for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s); } int main() { int n,v1,v2,l=0; nes=0; fill(k,k+200007,0); scanf("%d",&n); for(int i=0;i<n-1;i++) { scanf("%d%d",&v1,&v2); g[v1].push_back(v2); g[v2].push_back(v1); } for(int i=1;i<=n;i++) if(g[i].size()==1) l++; printf("%d\n",(l+1)/2); for(int i=1;i<=n;i++) if(g[i].size()>1) { dfs(i,0); for(int i=0;i<l/2;i++) printf("%d %d\n",k[i],k[i+l/2]); if(l%2==1) printf("%d %d",i,k[l-1]); return 0; } }
Compilation message
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 41 ms | 44156 KB | Output is correct |
2 | Correct | 42 ms | 44160 KB | Output is correct |
3 | Correct | 42 ms | 44152 KB | Output is correct |
4 | Correct | 45 ms | 44152 KB | Output is correct |
5 | Correct | 39 ms | 44156 KB | Output is correct |
6 | Correct | 40 ms | 44152 KB | Output is correct |
7 | Incorrect | 40 ms | 44152 KB | Breaking single line is causing network to disconnect. |
8 | Halted | 0 ms | 0 KB | - |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 41 ms | 44156 KB | Output is correct |
2 | Correct | 42 ms | 44160 KB | Output is correct |
3 | Correct | 42 ms | 44152 KB | Output is correct |
4 | Correct | 45 ms | 44152 KB | Output is correct |
5 | Correct | 39 ms | 44156 KB | Output is correct |
6 | Correct | 40 ms | 44152 KB | Output is correct |
7 | Incorrect | 40 ms | 44152 KB | Breaking single line is causing network to disconnect. |
8 | Halted | 0 ms | 0 KB | - |
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
1 | Correct | 41 ms | 44156 KB | Output is correct |
2 | Correct | 42 ms | 44160 KB | Output is correct |
3 | Correct | 42 ms | 44152 KB | Output is correct |
4 | Correct | 45 ms | 44152 KB | Output is correct |
5 | Correct | 39 ms | 44156 KB | Output is correct |
6 | Correct | 40 ms | 44152 KB | Output is correct |
7 | Incorrect | 40 ms | 44152 KB | Breaking single line is causing network to disconnect. |
8 | Halted | 0 ms | 0 KB | - |