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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#603293 | #8720. BFS 序 0 | UESTC_DebugSimulator# | WA | 277ms | 31724kb | C++17 | 2.9kb | 2024-10-01 15:44:10 | 2024-10-01 15:44:11 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define lowbit(i) (i&-i)
#define rand() (myrand())
using namespace std;
mt19937 myrand(time(0));
const int maxn = 5e5 + 5;
int n, _, q, m, dfn[maxn], cnt, now[maxn], head[maxn], tot, dep[maxn], fa[maxn];
struct EDGE{
int next, to;
}edge[maxn<<1];
void addedge(int from, int to) {
edge[++cnt].next = head[from];
edge[cnt].to = to;
head[from] = cnt;
}
namespace Segtr{
int vmax[maxn<<2], vmin[maxn<<2];
int searchmin(int x, int l, int r, int ql, int qr) {
if (ql <= l && qr >= r) return vmin[x];
int mid = (l + r)>>1;
if (ql <= mid && qr > mid) return min(searchmin(x<<1, l, mid, ql, qr), searchmin(x<<1|1, mid + 1, r, ql, qr));
if (ql > mid) return searchmin(x<<1|1, mid + 1, r, ql, qr);
return searchmin(x<<1, l, mid, ql, qr);
}
int searchmax(int x, int l, int r, int ql, int qr) {
if (ql <= l && qr >= r) return vmax[x];
int mid = (l + r)>>1;
if (ql <= mid && qr > mid) return max(searchmax(x<<1, l, mid, ql, qr), searchmax(x<<1|1, mid + 1, r, ql, qr));
if (ql > mid) return searchmax(x<<1|1, mid + 1, r, ql, qr);
return searchmax(x<<1, l, mid, ql, qr);
}
void modify(int x, int l, int r, int ql, int t) {
if (l == r) {
if (t == 0) {
vmin[x] = 1e9;
vmax[x] = 0;
return;
}
vmin[x] = vmax[x] = t;
return;
}
int mid = (l + r)>>1;
if (ql <= mid) modify(x<<1, l, mid, ql, t);
else modify(x<<1|1, mid + 1, r, ql, t);
vmin[x] = min(vmin[x<<1], vmin[x<<1|1]);
vmax[x] = max(vmax[x<<1], vmax[x<<1|1]);
}
}
void dfs(int u, int p) {
dfn[u] = ++tot;
dep[u] = dep[p] + 1;
fa[u] = p;
for (int i = head[u] ; i ; i = edge[i].next) {
int v = edge[i].to;
if (v == p) continue;
dfs(v, u);
}
now[u] = tot;
}
void solve() {
cin >> n;
for (int i = 1 ; i <= (maxn<<2) - 5 ; ++i) Segtr::vmin[i] = 1e9;
for (int i = 2 ; i <= n ; ++i) {
int p;
cin >> p;
addedge(i, p);
addedge(p, i);
}
dfs(1, 0);
cin >> q;
for (int i = 1 ; i <= q ; ++i) {
cin >> m;
vector<int>pt(m + 1);
int jud = 0;
for (int j = 1 ; j <= m ; ++j) {
cin >> pt[j];
if (j > 1 && dep[pt[j]] < dep[pt[j - 1]]) jud = 1;
}
if (jud == 1) {
cout << "No" << '\n';
continue;
}
int p = m;
while(p >= 1) {
int l = p, r = p, pre = 0;
while(l - 1 >= 1 && dep[pt[l]] == dep[pt[l - 1]]) l--;
for (int j = l ; j <= r ; ++j) {
int vmax = Segtr::searchmax(1, 1, n, dfn[pt[j]], now[pt[j]]);
int vmin = Segtr::searchmin(1, 1, n, dfn[pt[j]], now[pt[j]]);
if (vmin < pre) jud = 1;
pre = max(pre, vmax);
}
for (int j = l ; j <= r ; ++j) {
Segtr::modify(1, 1, n, dfn[pt[j]], j);
}
p = l - 1;
}
for (int j = 1 ; j <= m ; ++j) Segtr::modify(1, 1, n, dfn[pt[j]], 0);
cout << (jud == 1 ? "No" : "Yes") << '\n';
}
}
signed main(void) {
ios::sync_with_stdio(false);
cin.tie(0);
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 19132kb
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: -100
Wrong Answer
time: 277ms
memory: 31724kb
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 Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes ...
result:
wrong answer expected NO, found YES [1st token]