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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#643522#8551. DFS Order 5MiniLongWA 11ms10112kbC++144.3kb2024-10-15 21:35:182024-10-15 21:35:19

Judging History

你现在查看的是最新测评结果

  • [2024-10-15 21:35:19]
  • 评测
  • 测评结果:WA
  • 用时:11ms
  • 内存:10112kb
  • [2024-10-15 21:35:18]
  • 提交

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);
    while(q--){
        bool ok = 1;
        read(m);
        _rep(i, 1, m) read(a[i]), ok &= !vis[a[i]], vis[a[i]] = 1;
        _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++;
            if(pos <= m){
                if(jump(lst, dep[lst] - dep[a[pos]]) == a[pos]){ok = 0; break;}
                int t = pre[a[pos]];
                if(!t || jump(lst, dep[lst] - dep[t]) != t){ok = 0; break;}
                lst = t, u = a[pos], tr.modify(u);
            }
        }
        puts(ok ? "Yes" : "No");
        tr.undo();
    }
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 9780kb

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: 11ms
memory: 10112kb

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
Yes
No
No
No
No
No
No
No
...

result:

wrong answer 89th words differ - expected: 'No', found: 'Yes'