# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
764946 |
2023-06-24T06:51:17 Z |
vjudge1 |
Network (BOI15_net) |
C++17 |
|
3 ms |
4948 KB |
/******************
tree-bends-in-youth
//22///06///2023///
******************/
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pb push_back
#define all(x) x.begin(), x.end()
using namespace std;
const ll N = 2e5 + 1;
const ll INF = 1e17;
const ll MOD = 1e9 + 7;
vector <ll> g[N];
map <ll,ll> used;
ll d[N];
void solve(){
ll n;
cin >> n;
set <ll> s;
for(ll i = 1;i <= n;i++){
s.insert(i);
}
for(ll i = 1;i < n;i++){
ll x,y;
cin >> x >> y;
g[x].pb(y);
g[y].pb(x);
if(g[x].size() > 1)s.erase(x);
if(g[y].size() > 1)s.erase(y);
}
vector <ll> a;
for(auto to : s){
a.pb(to);
}
cout << ((a.size() + 1) / 2) << '\n';
for(ll i = 0;i < a.size();i++){
if(s.count(a[i]) == 0)continue;
s.erase(a[i]);
cout << a[i] << " ";
if(s.empty()){
cout << a[i- 1] << '\n';
continue;
}
for(ll j = 1;j <= n;j++){
d[j] = 0;
}
queue <ll> q;
q.push(a[i]);
used.clear();
used[a[i]] = 1;
while(!q.empty()){
ll v= q.front();
q.pop();
for(auto to : g[v]){
if(used[to] == 0){
q.push(to);
used[to] = 1;
d[to] = d[v] + 1;
}
}
}
ll mx = 0,w = 0;
for(auto to : s){
if(d[to] > mx){
mx = d[to];
w = to;
}
}
cout << w << "\n";
s.erase(w);
}
}
main () {
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen("censor.in","r",stdin);
//freopen("censor.out","w",stdout);
ll T = 1;
//cin >> T;
for(ll i = 1;i <= T;i++){
// cout << "Case " << i << ":\n";
solve();
}
}
Compilation message
net.cpp: In function 'void solve()':
net.cpp:38:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | for(ll i = 0;i < a.size();i++){
| ~~^~~~~~~~~~
net.cpp: At global scope:
net.cpp:75:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
75 | main () {
| ^~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
2 ms |
4948 KB |
Output is correct |
3 |
Correct |
2 ms |
4948 KB |
Output is correct |
4 |
Correct |
2 ms |
4948 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
2 ms |
4948 KB |
Output is correct |
8 |
Correct |
2 ms |
4948 KB |
Output is correct |
9 |
Correct |
2 ms |
4948 KB |
Output is correct |
10 |
Correct |
2 ms |
4948 KB |
Output is correct |
11 |
Correct |
2 ms |
4948 KB |
Output is correct |
12 |
Correct |
2 ms |
4948 KB |
Output is correct |
13 |
Correct |
2 ms |
4948 KB |
Output is correct |
14 |
Correct |
2 ms |
4948 KB |
Output is correct |
15 |
Correct |
2 ms |
4948 KB |
Output is correct |
16 |
Correct |
2 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Incorrect |
3 ms |
4948 KB |
Breaking single line is causing network to disconnect. |
19 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
2 ms |
4948 KB |
Output is correct |
3 |
Correct |
2 ms |
4948 KB |
Output is correct |
4 |
Correct |
2 ms |
4948 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
2 ms |
4948 KB |
Output is correct |
8 |
Correct |
2 ms |
4948 KB |
Output is correct |
9 |
Correct |
2 ms |
4948 KB |
Output is correct |
10 |
Correct |
2 ms |
4948 KB |
Output is correct |
11 |
Correct |
2 ms |
4948 KB |
Output is correct |
12 |
Correct |
2 ms |
4948 KB |
Output is correct |
13 |
Correct |
2 ms |
4948 KB |
Output is correct |
14 |
Correct |
2 ms |
4948 KB |
Output is correct |
15 |
Correct |
2 ms |
4948 KB |
Output is correct |
16 |
Correct |
2 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Incorrect |
3 ms |
4948 KB |
Breaking single line is causing network to disconnect. |
19 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
4948 KB |
Output is correct |
2 |
Correct |
2 ms |
4948 KB |
Output is correct |
3 |
Correct |
2 ms |
4948 KB |
Output is correct |
4 |
Correct |
2 ms |
4948 KB |
Output is correct |
5 |
Correct |
2 ms |
4948 KB |
Output is correct |
6 |
Correct |
2 ms |
4948 KB |
Output is correct |
7 |
Correct |
2 ms |
4948 KB |
Output is correct |
8 |
Correct |
2 ms |
4948 KB |
Output is correct |
9 |
Correct |
2 ms |
4948 KB |
Output is correct |
10 |
Correct |
2 ms |
4948 KB |
Output is correct |
11 |
Correct |
2 ms |
4948 KB |
Output is correct |
12 |
Correct |
2 ms |
4948 KB |
Output is correct |
13 |
Correct |
2 ms |
4948 KB |
Output is correct |
14 |
Correct |
2 ms |
4948 KB |
Output is correct |
15 |
Correct |
2 ms |
4948 KB |
Output is correct |
16 |
Correct |
2 ms |
4948 KB |
Output is correct |
17 |
Correct |
3 ms |
4948 KB |
Output is correct |
18 |
Incorrect |
3 ms |
4948 KB |
Breaking single line is causing network to disconnect. |
19 |
Halted |
0 ms |
0 KB |
- |