Submission #534478

# Submission time Handle Problem Language Result Execution time Memory
534478 2022-03-08T07:53:27 Z Yazan_Alattar Network (BOI15_net) C++14
0 / 100
1 ms 304 KB
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 500007;
const ll inf = 1e18;
const ll mod = 1e9+7;
const double pi = acos(-1);
const int dx[] = {0, -1, 0, 1}, dy[] = {1, 0, -1, 0};
const int block = 320;

int n, cnt[M];
vector <int> v;

int main(){
	cin >> n;
	for(int i = 1; i < n; ++i){
		int a, b;
		cin >> a >> b;
		++cnt[a];
		++cnt[b];
	}
	for(int i = 1; i <= n; ++i) if(cnt[i] == 1) v.pb(i);
	
	cout << ((int)v.size() + 1) / 2 << endl;
	for(int i = 0; i < (int)v.size() - 1; i += 2) cout << v[i] << " " << v[i + 1] << endl;
	if((int)v.size() % 2) cout << v.back() << " " << (v.back() == 1 ? 2 : 1) << endl; 
	return 0;
}
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -