［抄题］: Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. Example: Input: nums = [-2,0,1,3], and target = 2 Outpu…

这两个题几乎一样,只是说611. Valid Triangle Number满足大于条件,259. 3Sum Smaller满足小于条件,两者都是先排序,然后用双指针的方式. 611. Valid Triangle Number 判断这个数组能组成三角形的个数,利用两边之和大于第三边 https://www.cnblogs.com/grandyang/p/7053730.html 暴力方法是找所有3个数的组合,看满足条件的,时间复杂度是O(n3). 此方法时间复杂度为O(n2).先排序,然后le…

题目: Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the conditionnums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2. R…

Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. Notice You may assume that each input would have exactly one solution. Example For example, given a…

3Sum Smaller Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and tar…

Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2. Retu…

Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2. Retu…

题目: Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2.…

class Solution(object): def threeSumSmaller(self, nums, target): """ :type nums: List[int] :type target: int :rtype: int """ nums.sort() n = len(nums) ans = 0 for k in range(n): i, j = k+1, n-1 while i<j: sum3 = nums[k] +…

题目: Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2.…