[LeetCode] 979. Distribute Coins in Binary Tree 在二叉樹中分配硬幣
You are given the root of a binary tree with n nodes where each node in the tree has node.val coins and there are n coins total. In one move, we ...
原文：[LeetCode] Arranging Coins 排列硬幣
You have a total of n coins that you want to form in a staircase shape, where every k th row must have exactly k coins. Given n, find the total number of full staircase rows that can be formed. n is ...
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lintcode ：Coins in Line II 硬幣排成線 II
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LeetCode（60）： 第k個排列
Medium！ 題目描述： 給出集合 [1,2,3,…,n]，其所有元素共有 n! 種排列。 按大小順序列出所有排列情況，並一一標記，當 n = 3 時, 所有排列如下： "123" "132" "213" "231" "312" "321 ...