6722 | 2023. 12. 17 20:20:25 | 111 | Tom és Jerry 3 | cpp17 | Elfogadva 50/50 | 108ms | 9532 KiB |
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
#define pii pair<int, int>
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
#ifdef CB
freopen("be2.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
#endif
int T;
cin >> T;
while (T--) {
int N, TS, JS, K;
cin >> N >> TS >> JS >> K;
vector<vector<int>> g(N + 1);
for (int i = 0; i < N - 1; i++) {
int a, b;
cin >> a >> b;
g[a].push_back(b);
g[b].push_back(a);
}
deque<int> q;
vector<int> td(N + 1, -1);
td[TS] = 0;
q.push_back(TS);
while (!q.empty()) {
int i = q.front();
q.pop_front();
for (int j : g[i]) {
if (td[j] == -1) {
td[j] = td[i] + 1;
q.push_back(j);
}
}
}
vector<int> jd(N + 1, -1);
jd[JS] = 0;
q.push_back(JS);
while (!q.empty()) {
int i = q.front();
q.pop_front();
for (int j : g[i]) {
if (jd[j] == -1) {
jd[j] = jd[i] + 1;
q.push_back(j);
}
}
}
int s = 0;
for (int i = 1; i <= N; i++) {
if (jd[i] < td[i] - 1) {
s = max(s, td[i]);
}
}
if (s <= K) {
cout << "IGEN" << '\n';
continue;
}
auto solve = [&](int i) {
vector<int> v(N + 1, -1);
deque<int> q;
q.push_back(i);
v[i] = 0;
int f;
while (!q.empty()) {
int j = f = q.front();
q.pop_front();
for (int k : g[j]) {
if (v[k] == -1) {
v[k] = v[j] + 1;
q.push_back(k);
}
}
}
return pii{f, v[f]};
};
auto [a, b] = solve(1);
auto [c, d] = solve(a);
if ((d + 1) / 2 <= K) {
cout << "IGEN" << '\n';
continue;
}
cout << "NEM" << '\n';
}
return 0;
}
Részfeladat | Összpont | Teszt | Verdikt | Idő | Memória | ||
---|---|---|---|---|---|---|---|
base | 50/50 | ||||||
1 | Elfogadva | 0/0 | 3ms | 1824 KiB | |||
2 | Elfogadva | 0/0 | 3ms | 2028 KiB | |||
3 | Elfogadva | 5/5 | 3ms | 2228 KiB | |||
4 | Elfogadva | 1/1 | 3ms | 2452 KiB | |||
5 | Elfogadva | 1/1 | 3ms | 2668 KiB | |||
6 | Elfogadva | 1/1 | 3ms | 2644 KiB | |||
7 | Elfogadva | 1/1 | 3ms | 2988 KiB | |||
8 | Elfogadva | 1/1 | 3ms | 2848 KiB | |||
9 | Elfogadva | 1/1 | 3ms | 2856 KiB | |||
10 | Elfogadva | 1/1 | 3ms | 2980 KiB | |||
11 | Elfogadva | 2/2 | 3ms | 3068 KiB | |||
12 | Elfogadva | 2/2 | 3ms | 3196 KiB | |||
13 | Elfogadva | 1/1 | 3ms | 3408 KiB | |||
14 | Elfogadva | 2/2 | 105ms | 7052 KiB | |||
15 | Elfogadva | 2/2 | 97ms | 5452 KiB | |||
16 | Elfogadva | 2/2 | 107ms | 7216 KiB | |||
17 | Elfogadva | 2/2 | 100ms | 8468 KiB | |||
18 | Elfogadva | 2/2 | 108ms | 6860 KiB | |||
19 | Elfogadva | 2/2 | 107ms | 7124 KiB | |||
20 | Elfogadva | 2/2 | 68ms | 8532 KiB | |||
21 | Elfogadva | 2/2 | 97ms | 5648 KiB | |||
22 | Elfogadva | 2/2 | 97ms | 5628 KiB | |||
23 | Elfogadva | 3/3 | 98ms | 8876 KiB | |||
24 | Elfogadva | 2/2 | 108ms | 7584 KiB | |||
25 | Elfogadva | 3/3 | 104ms | 7724 KiB | |||
26 | Elfogadva | 2/2 | 100ms | 9532 KiB | |||
27 | Elfogadva | 2/2 | 101ms | 6496 KiB | |||
28 | Elfogadva | 3/3 | 101ms | 6560 KiB |