解题思路：house robber i && ii && iii

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解题思路：house robber i && ii && iii

这系列题的背景:有个小偷要偷钱,每个屋内都有一定数额的钱,小偷要发家致富在北京买房的话势必要把所有屋子的钱都偷了,但是屋子之内装了警报器,在一定条件下会触发朝阳群众的电话,所以小偷必须聪明一点,才能保证偷到的钱最多. 问题i:这些屋子排成一排,连续两家失窃就会触发朝阳群众电话问题ii:这些屋子两成一个圈(四合院既视感),连续两家失窃就会触发朝阳群众电话问题iii:这些屋子组成一棵树,有连接的两个节点同时失窃就会触发朝阳群众电话 i: 思路:一道典型的dp问题,dp[i]表示在小偷路过第i间房…

House Robber I & II & III

House Robber You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security system connected and …

[LeetCode] 45. Jump Game II 解题思路

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leetcode day6 -- String to Integer (atoi) && Best Time to Buy and Sell Stock I II III

1. String to Integer (atoi) Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is inte…

leetcode array解题思路

Array *532. K-diff Pairs in an Array 方案一:暴力搜索, N平方的时间复杂度,空间复杂度N 数组长度为10000,使用O(N平方)的解法担心TLE,不建议使用,尽管最终验证还是可以过. 方案二:哈希时间复杂度N 空间复杂度N *1.two sum 思路: 使用hash, 顺序遍历数组,并记录每一个出现过的元素值和其下标,当遍历到当前元素时,查找target-当前元素值是否出现在map中,存在则返回结果 *16. 3Sum Closest 思路一:暴力 fo…

[LeetCode] Contains Duplicate(II,III)

Contains Duplicate Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. 解题思路用一个set保存数组中的值,假…

[LeetCode] 3Sum 解题思路

Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The solut…