From 2bbd7d55231feecb8430ee23d0622e91169c5911 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Wed, 31 Aug 2022 14:20:42 +0800
Subject: [PATCH] =?UTF-8?q?T263133=20=E6=8B=86=E7=BD=91=E7=BA=BF?=
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https://www.luogu.com.cn/record/85559526
---
 Luogu/T263133/T263133.cpp      | 69 ++++++++++++++++++++++++++++++++++
 Luogu/T263133/samples/tree.in  |  3 ++
 Luogu/T263133/samples/tree.out |  3 ++
 3 files changed, 75 insertions(+)
 create mode 100644 Luogu/T263133/T263133.cpp
 create mode 100644 Luogu/T263133/samples/tree.in
 create mode 100644 Luogu/T263133/samples/tree.out

diff --git a/Luogu/T263133/T263133.cpp b/Luogu/T263133/T263133.cpp
new file mode 100644
index 00000000..40b7c2d4
--- /dev/null
+++ b/Luogu/T263133/T263133.cpp
@@ -0,0 +1,69 @@
+#include <iostream>
+#include <cmath>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int t, n, k;
+std::vector<int> top, g[N];
+bool vis[N];
+
+void dfs(int u) {
+    vis[u] = true;
+
+    for (int v : g[u]) {
+        if (!vis[v]) dfs(v);
+    }
+
+    top.push_back(u);
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> t;
+
+    while (t--) {
+        top.clear();
+        std::fill_n(g, N, std::vector<int>());
+        std::fill_n(vis, N, false);
+
+        int ans = 0;
+
+        cin >> n >> k;
+
+        for (int i = 2, x; i <= n; i++) {
+            cin >> x;
+
+            g[i].push_back(x);
+            g[x].push_back(i);
+        }
+
+        dfs(1);
+
+        std::fill_n(vis, N, false);
+
+        for (int u : top) {
+            if (k <= 1) break;
+
+            if (vis[u]) continue;
+
+            for (int v : g[u]) {
+                if (vis[v]) continue;
+
+                vis[u] = vis[v] = true;
+                ans++;
+                k -= 2;
+            }
+        }
+
+        cout << ans + k << endl;
+    }
+
+    return 0;
+}
diff --git a/Luogu/T263133/samples/tree.in b/Luogu/T263133/samples/tree.in
new file mode 100644
index 00000000..ed28e233
--- /dev/null
+++ b/Luogu/T263133/samples/tree.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7464603693c092c589573d1deb3ba072c9d2e564230d10d4d10b0502cdff249d
+size 75948
diff --git a/Luogu/T263133/samples/tree.out b/Luogu/T263133/samples/tree.out
new file mode 100644
index 00000000..2fd0e145
--- /dev/null
+++ b/Luogu/T263133/samples/tree.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9603c54873cb21af523745c033b2d01ab7feebd5eec105232a09e42ea5425a2b
+size 50