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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#417357 | #8720. BFS 序 0 | light_ink_dots# | RE | 191ms | 87936kb | C++14 | 3.1kb | 2024-05-22 17:55:19 | 2024-05-22 17:55:19 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int main() {
static const int maxn = 500010, maxlg = 20;
int n;
scanf("%d", &n);
static int fa[maxn];
static vector<int> G[maxn];
for (int i = 2; i <= n; i++) scanf("%d", fa + i), G[fa[i]].push_back(i);
static int dfn[maxn], dep[maxn];
static int lg[maxn], st[maxlg][maxn];
static auto get = [](int u, int v) { return dep[u] < dep[v] ? u : v; };
static vector<int> vec[maxn];
function<void(int)> dfs = [&dfs](int u) {
static int c;
st[0][dfn[u] = ++c] = fa[u];
for (int i : G[u]) dep[i] = dep[u] + 1, dfs(i), vec[u].push_back(dfn[i]);
return;
};
dfs(1);
for (int i = 2; i <= n; i++) lg[i] = lg[i >> 1] + 1;
for (int l = 1; l <= lg[n]; l++)
for (int i = 1; i + (1 << l) - 1 <= n; i++)
st[l][i] = get(st[l - 1][i], st[l - 1][i + (1 << (l - 1))]);
auto lca = [](int u, int v) {
if (u == v)
return u;
u = dfn[u], v = dfn[v];
if (u > v)
swap(u, v);
int Lg = lg[v - (++u) + 1];
return get(st[Lg][u], st[Lg][v - (1 << Lg) + 1]);
};
int q;
scanf("%d", &q);
while (q--) {
int m;
bool ans = true;
scanf("%d", &m);
static int a[maxn];
for (int i = 1; i <= m; i++) scanf("%d", a + i);
static bool vis[maxn];
static vector<int> all;
static vector<pair<int, int>> G[maxn];
for (int i = 1; i + 1 <= m; i++) {
if (dep[a[i]] != dep[a[i + 1]]) {
ans &= dep[a[i]] < dep[a[i + 1]];
continue;
}
int l = lca(a[i], a[i + 1]);
if (!vis[l])
vis[l] = true, all.push_back(l);
int u = *prev(upper_bound(vec[l].begin(), vec[l].end(), dfn[a[i]]));
int v = *prev(upper_bound(vec[l].begin(), vec[l].end(), dfn[a[i + 1]]));
G[l].emplace_back(u, v);
}
for (int u : all) {
vector<int> cur;
static vector<int> g[maxn];
static bool v[maxn];
static int deg[maxn];
for (auto e : G[u]) {
if (!v[e.first])
v[e.first] = true, cur.push_back(e.first);
if (!v[e.second])
v[e.second] = true, cur.push_back(e.second);
g[e.first].push_back(e.second), deg[e.second]++;
}
int tot = 0;
queue<int> q;
for (int i : cur)
if (!deg[i])
q.push(i);
while (!q.empty()) {
int u = q.front();
q.pop(), tot++;
for (int i : g[u])
if (!(--deg[i]))
q.push(i);
}
ans &= tot == cur.size();
for (int i : cur) v[i] = false, deg[i] = 0, g[i].clear();
G[u].clear(), vis[u] = false;
}
printf(ans ? "Yes\n" : "No\n");
all.clear();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 4ms
memory: 50640kb
input:
6 1 1 3 2 4 10 4 3 6 2 5 1 4 3 2 4 5 5 2 5 4 6 3 3 1 4 2 3 5 6 3 5 4 5 2 6 1 4 4 3 2 5 4 4 6 2 3 3 3 2 6
output:
No Yes Yes No No No No No No Yes
result:
ok 10 token(s): yes count is 3, no count is 7
Test #2:
score: 0
Accepted
time: 191ms
memory: 87924kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
No Yes Yes Yes No No No No No No Yes Yes No Yes No Yes Yes Yes No No No No Yes No No Yes No No No No Yes Yes Yes No No Yes No No No No No No No Yes No Yes No Yes No No No No Yes Yes Yes No No Yes No No No No No Yes Yes No No No No No Yes Yes No Yes No No No Yes No No Yes No No Yes Yes Yes No No No Y...
result:
ok 254 token(s): yes count is 89, no count is 165
Test #3:
score: 0
Accepted
time: 171ms
memory: 87872kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
Yes No No Yes No No Yes Yes No Yes No Yes No No No Yes No No No No Yes No No No No No Yes Yes No No No Yes No No No No No Yes Yes Yes No No No No No No No Yes No Yes No No No Yes No No No Yes No No Yes No Yes Yes No No No Yes No Yes Yes Yes No Yes No Yes Yes Yes Yes Yes No Yes No No No No No Yes No ...
result:
ok 266 token(s): yes count is 102, no count is 164
Test #4:
score: 0
Accepted
time: 165ms
memory: 87936kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
No No Yes No Yes No No No No No No No No Yes No No No No No No No No Yes No No No No Yes No No No No No No No Yes Yes No No No No No No Yes No No No Yes Yes No No No Yes Yes No Yes No Yes No Yes No Yes No Yes No No Yes No No No No No No No Yes Yes No Yes No No No No No No Yes Yes No Yes Yes No No No...
result:
ok 252 token(s): yes count is 87, no count is 165
Test #5:
score: -100
Runtime Error
input:
10 1 1 3 3 1 3 1 3 9 10000 4 3 5 6 9 5 3 1 4 9 6 5 6 4 3 5 7 28 8 3 4 3 1 6 3 5 8 7 2 4 4 4 2 7 5 9 2 4 10 8 4 10 3 4 5 7 3 5 2 9 6 4 7 2 3 9 5 5 9 2 5 6 1 12 3 5 8 8 1 3 5 8 4 5 9 1 29 3 9 9 1 5 8 5 5 6 10 8 8 4 8 4 2 8 10 5 7 3 7 1 8 4 7 5 1 6 7 5 9 8 3 2 1 6 4 4 1 9 5 22 10 9 5 4 5 8 10 3 2 1 10 ...