QOJ.ac

QOJ

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
#661217	#8551. DFS Order 5	hjxddl	WA	27ms	11556kb	C++20	4.3kb	2024-10-20 15:18:11	2024-10-20 15:18:11

Judging History

你现在查看的是最新测评结果

[2024-10-20 15:18:11]
评测

测评结果：WA
用时：27ms
内存：11556kb

查看

[2024-10-20 15:18:11]
提交

answer

// Coded by hjxddl
#include <bits/stdc++.h>
#define ll  long long
#define db  double
#define mid (l + r >> 1)
const int N = 1e5 + 5;
std::vector<std::vector<int>> e(N);
int n, q;
int sum[N << 2], set[2][N << 2];
void pushdown(int x, int l, int r) {
    if (!set[0][x] && !set[1][x]) return;
    int tar = set[0][x] ? 0 : 1;
    // std::cerr << x << " " << l << " " << r << '\n';
    sum[x << 1] = (mid - l + 1) * tar;
    sum[x << 1 | 1] = (r - (mid + 1) + 1) * tar;
    set[tar][x << 1] = set[tar][x << 1 | 1] = 1;
    set[tar ^ 1][x << 1] = set[tar ^ 1][x << 1 | 1] = 0;
    set[0][x] = set[1][x] = 0;
}
void change(int opt, int l1, int r1, int x = 1, int l = 1, int r = n) {
    if (l1 <= l && r <= r1) {
        sum[x] = r - l + 1;
        set[opt][x] = 1;
        set[opt ^ 1][x] = 0;
        return;
    }
    // std::cerr << opt << " " << l1 << " " << r1 << " " << x << " " << l << " " << r << '\n';
    pushdown(x, l, r);
    if (l1 <= mid)
        change(opt, l1, r1, x << 1, l, mid);
    if (r1 > mid)
        change(opt, l1, r1, x << 1 | 1, mid + 1, r);
    sum[x] = sum[x << 1] + sum[x << 1 | 1];
}
bool query(int k, int x = 1, int l = 1, int r = n) {
    if (sum[x] == r - l + 1)
        return true;
    if (sum[x] == 0)
        return false;
    // std::cerr << k << " " << x << " " << l << " " << r << " " << sum[x] << '\n';
    pushdown(x, l, r);
    int ans = false;
    if (k <= mid)
        ans = query(k, x << 1, l, mid);
    else
        ans = query(k, x << 1 | 1, mid + 1, r);
    sum[x] = sum[x << 1] + sum[x << 1 | 1];
    return ans;
}
int fa[N], son[N], dfn[N], tot, sz[N], dep[N], top[N], r_dfn[N];
void dfs1(int x, int f) {
    fa[x] = f;
    sz[x] = 1;
    dep[x] = dep[f] + 1;
    int maxson = 0;
    for (int y : e[x]) {
        if (y == f) continue;
        dfs1(y, x);
        sz[x] += sz[y];
        if (maxson < sz[y]) {
            son[x] = y;
            maxson = sz[y];
        }
    }
}
void dfs2(int x, int topx) {
    dfn[x] = ++tot;
    r_dfn[tot] = x;
    top[x] = topx;
    if (!son[x]) return;
    dfs2(son[x], topx);
    for (int y : e[x]) {
        if (y == fa[x] || y == son[x]) continue;
        dfs2(y, y);
    }
}
int lca(int x, int y) {
    while (top[x] != top[y]) {
        if (dep[top[x]] > dep[top[y]]) {
            x = fa[top[x]];
        } else
            y = fa[top[y]];
    }
    return dep[x] < dep[y] ? x : y;
}
int ance(int x, int k) {
    if (!k) return x;
    while (dep[x] - dep[fa[top[x]]] <= k) {
        k -= dep[x] - dep[fa[top[x]]];
        x = fa[top[x]];
    }
    return r_dfn[dfn[x] - k];
}
void solve() {
    std::cin >> n >> q;
    for (int i = 1; i < n; i++) {
        int u, v;
        std::cin >> u >> v;
        e[u].push_back(v);
        e[v].push_back(u);
    }
    dfs1(1, 1);
    dfs2(1, 1);
    std::vector<int> a(n + 5);
    while (q--) {
        change(0, 1, n);
        int k;
        std::cin >> k;
        for (int i = 1; i <= k; i++)
            std::cin >> a[i];
        int x = a[1];
        while (top[x] != 1) {
            change(1, dfn[top[x]], dfn[x]);
            x = fa[top[x]];
        }
        change(1, dfn[1], dfn[x]);
        bool vis = 0;
        for (int i = 2; i <= k; i++) {
            int x = a[i], lst = a[i - 1];
            if (son[lst]) {
                if (fa[x] != lst) {
                    std::cout << "No" << '\n';
                    vis = 1;
                    break;
                }
                change(1, dfn[x], dfn[x]);
            } else {
                int anc = lca(lst, x);
                int top1 = ance(x, dep[x] - dep[anc] - 1);
                // std::cerr << anc << " " << top1 << " " << x << " " << fa[x] << " " << lst << " " << query(dfn[x]) << '\n';
                if (fa[x] != anc || query(dfn[x])) {
                    std::cout << "No" << '\n';
                    vis = 1;
                    break;
                }
                change(1, dfn[top1], dfn[top1] + sz[top1] - 1);
            }
        }
        if (vis) continue;
        std::cout << "Yes\n";
    }
}
int main() {
    std::ios::sync_with_stdio(0);
    std::cin.tie(0), std::cout.tie(0);
    int t = 1;
    // std::cin >> t;
    while (t--) {
        solve();
    }
    std::cout << std::flush;
}

源文件, 语言: C++20

詳細信息

Test #1:

score: 100

Accepted

time: 0ms

memory: 11556kb

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: 27ms

memory: 11540kb

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 116th words differ - expected: 'No', found: 'Yes'