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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#643542#8551. DFS Order 5MiniLongWA 7ms9728kbC++144.7kb2024-10-15 21:41:412024-10-15 21:41:41

Judging History

你现在查看的是最新测评结果

  • [2024-10-15 21:41:41]
  • 评测
  • 测评结果:WA
  • 用时:7ms
  • 内存:9728kb
  • [2024-10-15 21:41:41]
  • 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);
    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;
}

詳細信息

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'