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mirror of https://git.sb/baoshuo/OI-codes.git synced 2024-11-09 23:58:48 +00:00

#1693. 【2022.10.25 联考】成语接龙

https://sjzezoj.com/submission/61821
This commit is contained in:
Baoshuo Ren 2022-10-26 08:02:41 +08:00
parent 6d17789bed
commit 5c67779848
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
48 changed files with 224 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 2e5 + 5;
int n, m, q, c[N << 1], p[N], ans[N << 1], lst[N];
bool vis[N];
std::vector<int> g[N << 1], circle;
int dfs1(int u) {
if (vis[u]) return u;
vis[u] = true;
return dfs1(p[u]);
}
void dfs2(int u, int f, int d) {
int x = lst[c[u]];
ans[u] = std::min({ans[u], ans[f] + 1, d - x + 1});
lst[c[u]] = d;
for (int v : g[u]) {
if (v == f) continue;
dfs2(v, u, d + 1);
}
lst[c[u]] = x;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> c[i];
}
for (int i = 1; i <= n; i++) {
cin >> p[i];
}
int root = dfs1(1);
std::fill_n(vis, N, false);
for (int u = p[root]; u != root; u = p[u]) {
circle.emplace_back(u);
}
circle.emplace_back(root);
for (int x : circle) {
vis[x] = true;
c[x + n] = c[x];
}
g[p[root] + n].emplace_back(root);
for (int i = 1; i < circle.size(); i++) {
g[circle[i]].emplace_back(circle[i - 1]);
g[circle[i] + n].emplace_back(circle[i - 1] + n);
}
for (int i = 1; i <= n; i++) {
if (vis[i] && vis[p[i]]) continue;
g[p[i]].emplace_back(i);
}
std::fill_n(ans, N << 1, 0x3f3f3f3f);
ans[root + n] = 1;
dfs2(root + n, 0, 1);
cin >> q;
while (q--) {
int x;
cin >> x;
cout << ans[x] << endl;
}
return 0;
}

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