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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#643542 | #8551. DFS Order 5 | MiniLong | WA | 7ms | 9728kb | C++14 | 4.7kb | 2024-10-15 21:41:41 | 2024-10-15 21:41:41 |
Judging History
answer
#include <bits/stdc++.h>
#define _rep(i, x, y) for(int i = x; i <= y; ++i)
#define _req(i, x, y) for(int i = x; i >= y; --i)
#define _rev(i, u) for(int i = head[u]; i; i = e[i].nxt)
#define pb push_back
#define fi first
#define se second
#define mst(f, i) memset(f, i, sizeof f)
using namespace std;
#ifdef ONLINE_JUDGE
#define debug(...) 0
#else
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#endif
typedef long long ll;
typedef pair<int, int> PII;
namespace fastio{
#ifdef ONLINE_JUDGE
char ibuf[1 << 20],*p1 = ibuf, *p2 = ibuf;
#define get() p1 == p2 && (p2 = (p1 = ibuf) + fread(ibuf, 1, 1 << 20, stdin), p1 == p2) ? EOF : *p1++
#else
#define get() getchar()
#endif
template<typename T> inline void read(T &t){
T x = 0, f = 1;
char c = getchar();
while(!isdigit(c)){
if(c == '-') f = -f;
c = getchar();
}
while(isdigit(c)) x = x * 10 + c - '0', c = getchar();
t = x * f;
}
template<typename T, typename ... Args> inline void read(T &t, Args&... args){
read(t);
read(args...);
}
template<typename T> void write(T t){
if(t < 0) putchar('-'), t = -t;
if(t >= 10) write(t / 10);
putchar(t % 10 + '0');
}
template<typename T, typename ... Args> void write(T t, Args... args){
write(t), putchar(' '), write(args...);
}
template<typename T> void writeln(T t){
write(t);
puts("");
}
template<typename T> void writes(T t){
write(t), putchar(' ');
}
#undef get
};
using namespace fastio;
#define multitest() int T; read(T); _rep(tCase, 1, T)
namespace Calculation{
const ll mod = 998244353;
ll ksm(ll p, ll h){ll base = p % mod, res = 1; while(h){if(h & 1ll) res = res * base % mod; base = base * base % mod, h >>= 1ll;} return res;}
void dec(ll &x, ll y){x = ((x - y) % mod + mod) % mod;}
void add(ll &x, ll y){x = (x + y) % mod;}
void mul(ll &x, ll y){x = x * y % mod;}
ll sub(ll x, ll y){return ((x - y) % mod + mod) % mod;}
ll pls(ll x, ll y){return ((x + y) % mod + mod) % mod;}
ll mult(ll x, ll y){return x * y % mod;}
}
using namespace Calculation;
const int N = 1e5 + 5;
int n, q, id, dfn[N], siz[N], pre[N], dep[N], f[N][25];
vector<int> G[N];
void dfs(int u, int fa){
siz[u] = 1, dfn[u] = ++id, pre[u] = f[u][0] = fa, dep[u] = dep[fa] + 1;
_rep(i, 1, 20) f[u][i] = f[f[u][i - 1]][i - 1];
for(auto &v : G[u]){
if(v == fa) continue;
dfs(v, u), siz[u] += siz[v];
}
}
int jump(int u, int k){
_req(i, 20, 0) if(k >> i & 1) u = f[u][i];
return u;
}
int m, a[N];
struct bit{
int c[N];
void add(int x, int val){for(; x <= n; x += x & -x) c[x] += val;}
int ask(int x){int res = 0; for(; x; x -= x & -x) res += c[x]; return res;}
int top, st[N];
void modify(int x){add(dfn[x], 1), st[++top] = x;}
int query(int x){return ask(dfn[x] + siz[x] - 1) - ask(dfn[x] - 1);}
void undo(){while(top) add(dfn[st[top--]], -1);}
}tr;
bool vis[N];
int main(){
read(n, q);
_rep(i, 2, n){
int u, v; read(u, v);
G[u].pb(v), G[v].pb(u);
}
_rep(i, 1, n) sort(G[i].begin(), G[i].end());
dfs(1, 0);
int lstq = q, ttt = 0;
while(q--){
bool ok = 1;
read(m);
_rep(i, 1, m) read(a[i]), ok &= !vis[a[i]], vis[a[i]] = 1;
// if(++ttt == 89){
// writeln(m);
// _rep(i, 1, m) writes(a[i]); puts("");
// }
_rep(i, 1, m) vis[a[i]] = 0;
if(!ok){puts("No"); continue;}
int u = a[1], pos = 1, lst = a[1];
tr.modify(u);
while(pos <= m){
int t = siz[u];
_rep(i, 2, t){
if(pos == m) break;
pos++;
while(u && tr.query(u) == siz[u]) u = pre[u];
if(!u || a[pos] == pre[u] || !binary_search(G[u].begin(), G[u].end(), a[pos])){ok = 0; break;}
u = a[pos], tr.modify(u);
}
if(!ok) break;
pos++;
debug("u:%d pos:%d\n", u, pos);
if(pos <= m){
if(dep[lst] >= dep[a[pos]] && jump(lst, dep[lst] - dep[a[pos]]) == a[pos]){ok = 0; break;}
if(dep[a[pos]] >= dep[lst] && jump(a[pos], dep[a[pos]] - dep[lst]) == lst){ok = 0; break;}
int t = pre[a[pos]];
if(dep[t] > dep[lst]){ok = 0; break;}
if(!t || jump(lst, dep[lst] - dep[t]) != t){ok = 0; break;}
lst = t, u = a[pos], tr.modify(u);
}
}
// if(lstq <= 10)
puts(ok ? "Yes" : "No");
tr.undo();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 9728kb
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: 7ms
memory: 8404kb
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 No No No No No No No No No No No 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 No No No No No No No No N...
result:
wrong answer 1919th words differ - expected: 'Yes', found: 'No'