| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 286734 |
2020-08-30T20:18:45 Z |
Marlov |
Network (BOI15_net) |
C++14 |
|
641 ms |
77512 KB |
/*
Code by @marlov
*/
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <iomanip>
#include <utility>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <iterator>
using namespace std;
typedef long long ll;
typedef pair<int,int> pi;
#define maxN 500005
int N;
int tl=0;
int leaves[maxN];
int root=0;
vector<int> adj[maxN];
vector< pair<int,int> > edges;
vector< vector<int> > connect;
priority_queue< pair<int,int> > pq;
void findRoot(int n,int p){
if(adj[n].size()==1){
leaves[n]++;
}
bool wks=true;
for(int i:adj[n]) if(i!=p){
findRoot(i,n);
if(leaves[i]>floor(tl/2)) wks=false;
leaves[n]+=leaves[i];
}
if(tl-leaves[n]>floor(tl/2)) wks=false;
if(wks&&adj[n].size()>1) root=n;
}
void addL(int n,int p){
if(adj[n].size()==1){
connect.back().push_back(n);
return;
}
for(int i:adj[n]) if(i!=p){
addL(i,n);
}
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
cin>>N;
int u,v;
for(int i=0;i<N-1;i++){
cin>>u>>v;
u--;v--;
adj[u].push_back(v);
adj[v].push_back(u);
}
for(int i=0;i<N;i++){
if(adj[i].size()==1) tl++;
}
findRoot(0,-1);
for(int i:adj[root]){
int ci=connect.size();
connect.push_back(vector<int>(0));
addL(i,root);
pq.push(make_pair(connect[ci].size()-1,ci));
}
while(pq.size()>1){
int fi=pq.top().second;
int fl=pq.top().first; pq.pop();
int sl=pq.top().first;
int si=pq.top().second;pq.pop();
edges.push_back(make_pair(connect[fi][fl],connect[si][sl]));
if(fl>0) pq.push(make_pair(fl-1,fi));
if(sl>0) pq.push(make_pair(sl-1,si));
}
if(pq.size()==1){
edges.push_back(make_pair(connect[pq.top().second].front(),root));
}
cout<<edges.size()<<'\n';
for(int i=0;i<(int)edges.size();i++){
cout<<edges[i].first+1<<" "<<edges[i].second+1<<'\n';
}
return 0;
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1,n=0?)
* do smth instead of nothing and stay organized
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
8 ms |
12032 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12288 KB |
Output is correct |
| 23 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 25 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 57 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12288 KB |
Output is correct |
| 23 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 25 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 57 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 59 |
Correct |
498 ms |
49448 KB |
Output is correct |
| 60 |
Correct |
538 ms |
42736 KB |
Output is correct |
| 61 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 62 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 63 |
Correct |
438 ms |
43364 KB |
Output is correct |
| 64 |
Correct |
10 ms |
12800 KB |
Output is correct |
| 65 |
Correct |
20 ms |
14976 KB |
Output is correct |
| 66 |
Correct |
192 ms |
36628 KB |
Output is correct |
| 67 |
Correct |
641 ms |
61560 KB |
Output is correct |
| 68 |
Correct |
618 ms |
62728 KB |
Output is correct |
| 69 |
Correct |
18 ms |
14012 KB |
Output is correct |
| 70 |
Correct |
135 ms |
31876 KB |
Output is correct |
| 71 |
Correct |
493 ms |
77512 KB |
Output is correct |
| 72 |
Correct |
502 ms |
72648 KB |
Output is correct |
| 73 |
Correct |
106 ms |
19952 KB |
Output is correct |
| 74 |
Correct |
537 ms |
40744 KB |
Output is correct |
| 75 |
Correct |
41 ms |
17456 KB |
Output is correct |
| 76 |
Correct |
465 ms |
61520 KB |
Output is correct |
| 77 |
Correct |
451 ms |
62280 KB |
Output is correct |
| 78 |
Correct |
37 ms |
16512 KB |
Output is correct |
| 79 |
Correct |
619 ms |
58104 KB |
Output is correct |
| 80 |
Correct |
10 ms |
12504 KB |
Output is correct |
| 81 |
Correct |
149 ms |
27876 KB |
Output is correct |
| 82 |
Correct |
532 ms |
59616 KB |
Output is correct |
| 83 |
Correct |
526 ms |
40740 KB |
Output is correct |
| 84 |
Correct |
535 ms |
41196 KB |
Output is correct |
| 85 |
Correct |
528 ms |
41212 KB |
Output is correct |
| 86 |
Correct |
521 ms |
43176 KB |
Output is correct |
| 87 |
Correct |
513 ms |
42996 KB |
Output is correct |
