Write Java code to count number of nodes in a binary tree

Write Java code to count number of nodes in a binary tree

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: medium

标签: interviewbit, data-structure, topic-specific, data-structures, algorithms

参考答案摘要

int countNodes(Node root) { int count = 1; //Root itself should be counted if (root ==null) return 0; else { count += countNodes(root.left); count += countNodes(root.right); return count; } }

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