Your are given an array of positive integers nums. Count and print the number of (contiguous) subarrays where the product of all the elements in the subarray is less than k. Example 1: Input: nums = [10, 5, 2, 6], k = 100 Output: 8 Explanation: The 8…
Your are given an array of positive integers nums. Count and print the number of (contiguous) subarrays where the product of all the elements in the subarray is less than k. Example 1: Input: nums = [10, 5, 2, 6], k = 100 Output: 8 Explanation: The 8…
Q: A: 1.暴力找所有可能的子数组,n^2个子数组,最长长度n,则n ^3. 2.n^2解法 从1~n-1各起点开始,一直找到结尾,n^2 class Solution { public: int subarraySum(vector<int>& nums, int k) { int res=0; for(int i=0;i<nums.size();++i){ int sum=0; for(int j=i;j<nums.size();++j){ sum+=nums[j]…
560. 和为K的子数组 知识点:数组:前缀和: 题目描述 给定一个整数数组和一个整数 k,你需要找到该数组中和为 k 的连续的子数组的个数. 示例 输入:nums = [1,1,1], k = 2 输出: 2 , [1,1] 与 [1,1] 为两种不同的情况. 解法一:暴力法 直接以每个元素为首开始: class Solution { public int subarraySum(int[] nums, int k) { int sum = 0; int count = 0; for(int…
2018-09-01 23:02:46 问题求解: 问题求解: 最开始的时候,一眼看过去就是一条 dp 嘛,保存每个数字结尾的长度和,最后求和就好,至于长度如何求,本题中需要用滑动窗口来维护. 很好的题目,将滑动窗口算法和动态规划巧妙的结合了起来. public int numSubarrayProductLessThanK(int[] nums, int k) { if (k <= 1) return 0; int res = 0; int begin = 0; int cur = 1; fo…
Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:nums = [1,1,1], k = 2 Output: 2 Note: The length of the array is in range [1, 20,000]. The range of numbers…
public class Solution { public int subarraySum(int[] nums, int k) { int count = 0, pre = 0; HashMap < Integer, Integer > map = new HashMap < > (); map.put(0, 1); for (int i = 0; i < nums.length; i++) { pre += nums[i]; if (mp.containsKey(pre…
题意: 长度不小于 k 的公共子串的个数 分析: 基本思路是计算 A 的所有后缀和 B 的所有后缀之间的最长公共前缀的长度,把最长公共前缀长度不小于 k 的部分全部加起来. 先将两个字符串连起来,中间用一个没有出现过的字符隔开.按 height 值分组后,接下来的工作便是快速的统计每组中后缀之间的最长公共前缀之和. 扫描一遍,每遇到一个 B 的后缀就统计与前面的 A 的后缀能产生多少个长度不小于 k 的公共子串, 这里 A 的后缀需要用一个单调的栈来高效的维护.然后对 A 也这样做一次. //…
Common Substrings Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 11469 Accepted: 3796 Description A substring of a string T is defined as: T(i, k)=TiTi+1...Ti+k-1, 1≤i≤i+k-1≤|T|. Given two strings A, B and one integer K, we define S,…
Life Forms Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 16223 Accepted: 4763 Description You may have wondered why most extraterrestrial life forms resemble humans, differing by superficial traits such as height, colour, wrinkles, e…
Description A substring of a string T is defined as: T( i, k)= TiTi+1... Ti+k-1, 1≤ i≤ i+k-1≤| T|. Given two strings A, B and one integer K, we define S, a set of triples (i, j, k): S = {( i, j, k) | k≥ K, A( i, k)= B( j, k)}. You are to give the val…
Return the length of the shortest, non-empty, contiguous subarray of A with sum at least K. If there is no non-empty subarray with sum at least K, return -1. Example 1: Input: A = [1], K = 1 Output: 1 Example 2: Input: A = [1,2], K = 4 Output: -1 Exa…
