洛谷 P4913 二叉樹深度

題目連結：二叉樹深度

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思路

儲存二叉樹的各個節點並遞迴搜尋二叉樹深度。

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題解

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N = 1e5 + 10;
struct binary {
  int lchild, rchild;
}tree[N];

// 遞迴搜尋
ll query(int now) {
  if (tree[now].lchild == 0 && tree[now].rchild == 0) {
    return 1;
  }
  ll res = query(tree[now].lchild);
  res = max(res, query(tree[now].rchild));
  return res + 1;
}

int main() {
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    int l, r;
    cin >> l >> r;
    tree[i].lchild = l, tree[i].rchild = r;
  }
  cout << query(1) << endl;
  return 0;
}