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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
#661191	#8551. DFS Order 5	hjxddl^#	WA	28ms	11496kb	C++20	4.3kb	2024-10-20 15:07:52	2024-10-20 15:07:54

Judging History

你现在查看的是最新测评结果

[2024-10-20 15:07:54]
评测

测评结果：WA
用时：28ms
内存：11496kb

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[2024-10-20 15:07:52]
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);
    }
}
std::pair<int, int> lca(int x, int y) {
    int lstx = 0;
    while (top[x] != top[y]) {
        if (dep[top[x]] > dep[top[y]]) {
            lstx = x;
            x = fa[top[x]];
        } else
            y = fa[top[y]];
    }
    return {dep[x] < dep[y] ? x : y, top[lstx]};
}
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 {
                auto [anc, top1] = lca(lst, x);
                // 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;
                }
                if (fa[top1] != anc) {
                    top1 = fa[top1];
                    top1 = r_dfn[dfn[top1] - (dep[top1] - (dep[anc] + 1))];
                }
                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

详细

Test #1:

score: 100

Accepted

time: 2ms

memory: 9284kb

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: 28ms

memory: 11496kb

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'