| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 252226 |
2020-07-24T22:43:25 Z |
Blagojce |
Network (BOI15_net) |
C++11 |
|
978 ms |
77500 KB |
#include <bits/stdc++.h>
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1000000007;
const ld eps = 1e-13;
const ld pi = 3.14159265359;
mt19937 _rand(time(NULL));
clock_t timer = clock();
const int mxn = 5e5;
int n;
vector<int> g[mxn];
vector<int> v;
int sz[mxn];
void dfs(int u, int p){
sz[u] = 0;
for(auto e : g[u]){
if(e == p) continue;
dfs(e, u);
sz[u] += sz[e];
}
if((int)g[u].size()==1) ++sz[u];
}
int tot = 0;
int dfs1(int u, int p){
for(auto e : g[u]){
if(e!=p && sz[e] > tot/2) return dfs1(e, u);
}
return u;
}
vector<int> V;
void dfs2(int u, int p){
for(auto e : g[u]){
if(e == p) continue;
dfs2(e, u);
}
if((int)g[u].size()==1) V.pb(u);
}
void solve(){
cin >> n;
fr(i, 0, n-1){
int u, v;
cin >> u >> v;
--u, --v;
g[u].pb(v);
g[v].pb(u);
}
dfs(0, 0);
tot = sz[0];
int leaf_cen = dfs1(0, 0);
pq<pair<int,int> > Q;
vector<vector<int> > v;
for(auto e : g[leaf_cen]){
V.clear();
dfs2(e, leaf_cen);
Q.push({V.size(), v.size()});
v.pb(V);
}
vector<pii> sol;
while(!Q.empty()){
while(!Q.empty() && (int)v[Q.top().nd].size() != (int)Q.top().st){
Q.pop();
}
if(Q.empty())break;
int i = Q.top().nd;
Q.pop();
while(!Q.empty() && (int)v[Q.top().nd].size() != (int)Q.top().st){
Q.pop();
}
if(Q.empty())break;
int j = Q.top().nd;
Q.pop();
int a = v[i].back();
int b = v[j].back();
sol.pb({a, b});
v[i].pop_back();
v[j].pop_back();
if(v[i].size() > 0){
Q.push({v[i].size(), i});
}
if(v[j].size() > 0){
Q.push({v[j].size(), j});
}
}
for(auto u : v){
if(!u.empty()){
sol.pb({u[0], leaf_cen});
}
}
cout<<sol.size() << endl;
for(auto u : sol){
cout<<u.st+1<<' '<<u.nd+1<<endl;
}
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
solve();
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
6 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12032 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
6 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
10 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 |
9 ms |
12288 KB |
Output is correct |
| 27 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
7 ms |
12020 KB |
Output is correct |
| 31 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
7 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 |
9 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
7 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 |
7 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
10 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 |
10 ms |
12288 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
6 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
9 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
10 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 |
9 ms |
12288 KB |
Output is correct |
| 27 |
Correct |
9 ms |
12288 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
7 ms |
12020 KB |
Output is correct |
| 31 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
7 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 |
9 ms |
12032 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
10 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
7 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 |
7 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
10 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 |
10 ms |
12288 KB |
Output is correct |
| 59 |
Correct |
793 ms |
49232 KB |
Output is correct |
| 60 |
Correct |
813 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 |
691 ms |
43352 KB |
Output is correct |
| 64 |
Correct |
9 ms |
12672 KB |
Output is correct |
| 65 |
Correct |
21 ms |
14720 KB |
Output is correct |
| 66 |
Correct |
242 ms |
34040 KB |
Output is correct |
| 67 |
Correct |
657 ms |
57464 KB |
Output is correct |
| 68 |
Correct |
694 ms |
58736 KB |
Output is correct |
| 69 |
Correct |
31 ms |
14012 KB |
Output is correct |
| 70 |
Correct |
280 ms |
31844 KB |
Output is correct |
| 71 |
Correct |
932 ms |
77500 KB |
Output is correct |
| 72 |
Correct |
920 ms |
72832 KB |
Output is correct |
| 73 |
Correct |
182 ms |
20280 KB |
Output is correct |
| 74 |
Correct |
803 ms |
41192 KB |
Output is correct |
| 75 |
Correct |
93 ms |
17456 KB |
Output is correct |
| 76 |
Correct |
896 ms |
62396 KB |
Output is correct |
| 77 |
Correct |
915 ms |
63304 KB |
Output is correct |
| 78 |
Correct |
48 ms |
16248 KB |
Output is correct |
| 79 |
Correct |
673 ms |
54452 KB |
Output is correct |
| 80 |
Correct |
12 ms |
12544 KB |
Output is correct |
| 81 |
Correct |
290 ms |
28128 KB |
Output is correct |
| 82 |
Correct |
896 ms |
60308 KB |
Output is correct |
| 83 |
Correct |
741 ms |
41324 KB |
Output is correct |
| 84 |
Correct |
872 ms |
41204 KB |
Output is correct |
| 85 |
Correct |
869 ms |
41172 KB |
Output is correct |
| 86 |
Correct |
870 ms |
42880 KB |
Output is correct |
| 87 |
Correct |
978 ms |
42764 KB |
Output is correct |
