9028 | 2024. 02. 12 11:59:26 | Ignác | Parti (75 pont) | cpp17 | Hibás válasz 72/75 | 71ms | 7184 KiB |
// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
if (n < 3) {
cout << 0;
return 0;
}
vector<int> db(n + 1);
vector<pair<int, int>> to(n + 1);
for (int i = 1; i <= n; i++) {
int a, b;
cin >> a >> b;
db[a]++;
db[b]++;
to[i].first = a;
to[i].second = b;
}
queue<int> out;
for (int i = 1; i <= n; i++) {
if (db[i] < 2) {
out.push(i);
db[i] = -1;
}
}
while (out.size() > 0) {
//cout << out.front() << "\n";
db[to[out.front()].first]--;
db[to[out.front()].second]--;
if (db[to[out.front()].first] < 2 && db[to[out.front()].first] > -1) {
out.push(to[out.front()].first);
db[to[out.front()].first] = -1;
}
if (db[to[out.front()].second] < 2 && db[to[out.front()].second] > -1) {
out.push(to[out.front()].second);
db[to[out.front()].second] = -1;
}
out.pop();
}
string ans;
int cnt = 0;
for (int i = 1; i <= n; i++) {
if (db[i] >= 2) {
ans += to_string(i) + " ";
cnt++;
}
}
cout << cnt << "\n" << ans;
}
Részfeladat | Összpont | Teszt | Verdikt | Idő | Memória | ||
---|---|---|---|---|---|---|---|
base | 72/75 | ||||||
1 | Elfogadva | 0/0 | 3ms | 1812 KiB | |||
2 | Elfogadva | 0/0 | 37ms | 3928 KiB | |||
3 | Elfogadva | 3/3 | 3ms | 2280 KiB | |||
4 | Elfogadva | 3/3 | 3ms | 2488 KiB | |||
5 | Hibás válasz | 0/3 | 3ms | 2776 KiB | |||
6 | Elfogadva | 3/3 | 3ms | 2840 KiB | |||
7 | Elfogadva | 3/3 | 3ms | 2876 KiB | |||
8 | Elfogadva | 4/4 | 3ms | 2884 KiB | |||
9 | Elfogadva | 4/4 | 3ms | 2992 KiB | |||
10 | Elfogadva | 4/4 | 4ms | 3092 KiB | |||
11 | Elfogadva | 4/4 | 3ms | 3100 KiB | |||
12 | Elfogadva | 4/4 | 4ms | 3324 KiB | |||
13 | Elfogadva | 4/4 | 4ms | 3428 KiB | |||
14 | Elfogadva | 4/4 | 4ms | 3512 KiB | |||
15 | Elfogadva | 4/4 | 37ms | 5096 KiB | |||
16 | Elfogadva | 4/4 | 48ms | 5968 KiB | |||
17 | Elfogadva | 4/4 | 50ms | 6316 KiB | |||
18 | Elfogadva | 4/4 | 57ms | 6388 KiB | |||
19 | Elfogadva | 4/4 | 71ms | 6872 KiB | |||
20 | Elfogadva | 4/4 | 71ms | 7140 KiB | |||
21 | Elfogadva | 4/4 | 71ms | 7184 KiB | |||
22 | Elfogadva | 4/4 | 3ms | 4088 KiB |