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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#642115 | #8551. DFS Order 5 | youthpaul | WA | 29ms | 3556kb | C++20 | 1.9kb | 2024-10-15 10:27:09 | 2024-10-15 10:27:09 |
Judging History
answer
#include<bits/stdc++.h>
#define fore(i,l,r) for(int i=(int)(l);i<(int)(r);++i)
#define fi first
#define se second
#define endl '\n'
#define ull unsigned long long
#define ALL(v) v.begin(), v.end()
#define Debug(x, ed) std::cerr << #x << " = " << x << ed;
const int INF=0x3f3f3f3f;
const long long INFLL=1e18;
typedef long long ll;
const int N = 100005;
const int K = 17;
std::vector<int> g[N];
int f[N][K + 1];
int h[N];
void dfs0(int u, int fa){
h[u] = h[fa] + 1;
f[u][0] = fa;
for(int k = 1; (1 << k) <= h[u]; ++k)
f[u][k] = f[f[u][k - 1]][k - 1];
for(auto v : g[u])
if(v != fa)
dfs0(v, u);
}
int lca(int u, int v){
if(h[u] < h[v]) std::swap(u, v);
for(int k = K; k >= 0; --k)
if(h[u] - (1 << k) >= h[v])
u = f[u][k];
if(u == v) return u;
for(int k = K; k >= 0; --k)
if(f[u][k] != f[v][k]){
u = f[u][k];
v = f[v][k];
}
return f[u][0];
}
int main(){
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
std::cout.tie(nullptr);
int n, q;
std::cin >> n >> q;
fore(i, 1, n){
int u, v;
std::cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
dfs0(1, 0);
std::vector<bool> oc(n + 1);
while(q--){
int m;
std::cin >> m;
std::vector<int> a(m);
fore(i, 0, m) std::cin >> a[i];
auto check = [&]() -> bool {
if(m == 1) return true;
oc[a[0]] = oc[1] = true;
fore(i, 1, m){
int u = a[i - 1], w = a[i];
if(oc[w]) return false;
oc[w] = true;
if(lca(u, f[w][0]) == f[w][0] && lca(u, w) != w)
continue;
return false;
}
return true;
};
std::cout << (check() ? "Yes" : "No") << endl;
for(auto x : a) oc[x] = false;
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3492kb
input:
6 7 1 2 1 3 2 4 3 5 2 6 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 2 4 6 6 1 2 6 4 3 5
output:
No No Yes No No Yes Yes
result:
ok 7 tokens
Test #2:
score: -100
Wrong Answer
time: 29ms
memory: 3556kb
input:
10 100000 7 2 1 7 7 10 8 6 8 7 1 3 4 5 9 5 5 8 8 8 9 7 2 8 1 6 1 4 8 3 5 2 6 7 10 3 9 9 1 1 1 8 10 3 2 9 3 8 7 3 7 5 6 2 8 5 9 1 6 3 4 6 2 1 3 5 8 9 2 4 9 1 3 2 1 5 5 8 5 1 7 9 10 5 2 9 2 6 4 10 6 3 8 3 4 5 8 2 8 4 9 4 10 1 2 4 3 3 6 3 1 3 6 1 1 6 8 3 1 3 7 3 2 3 9 1 5 4 3 7 8 10 9 4 2 3 10 2 5 4 3 ...
output:
No No No Yes No No No No Yes No No No No No No Yes No No No Yes No No No No No No No No No Yes No Yes No No No No No No Yes No No No No No Yes Yes No No No No No No No No No No No No No No No No No No No No No No No No Yes No No Yes Yes No No No No Yes No No No No No No No No Yes No No No No No No N...
result:
wrong answer 20th words differ - expected: 'No', found: 'Yes'