使用一个字典保存数组某个位置之前的数组和,然后遍历数组求和,这样当我们求到一个位置的和的时候,向前找sum-k是否在数组中,如果在的话,更新结果为之前的结果+1。同时,当前这个sum出现的次数就多了一次。 和560. Subarray Sum Equals K几乎一模一样的题目,为什么就是不会做呢? classSolution(object):defnumSubarr...
public int numSubarraysWithSum(int[] A, int S) { if (A.length == 0) return 0; int result = 0; int[] sumOne = new int[A.length]; int st = 0; int ed = 0; sumOne[0] = A[0] == 1 ? 1 : 0; for (int i = 1; i < A.length; i++) { sumOne[i] = A[i] =...
此时还需要考虑一种情况,就是当窗口左边有连续0的时候,因为0并不影响 sum,但是却要算作不同的子数组,所以要统计左起连续0的个数,并且加到结果 res 中即可,参见代码如下: 解法二: classSolution{ public:intnumSubarraysWithSum(vector<int>& A,intS) {intres =0,sum=0, left =0, n = A.size();for...
publicstaticintnumberOfSubarrays(int[]arr,int target){HashMap<Integer,Integer>map=newHashMap<>();int pre=0;map.put(0,1);int cnt=0;for(int i=0;i<arr.length;i++){pre+=arr[i];if(map.containsKey(pre-target)){cnt+=map.get(pre-target);}map.put(pre,map.getOrDefault(pre,0)+1)...
After the fix your algorithm will return 8, instead of the correct 5 (it remove the first 5 numbers) As far as I know there is no greedy solution to the problem. This problem is equivalent to finding a subarray of maximum size with a sum equal to K (the numbers you leave). This ...
LeetCode-Maximum Binary Tree Description: Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: The root is the maximum number in the array. The left subtree is the maximum tree constructed from left part subarray divided by the maximum number...
Explanation: [0, 1] (or [1, 0]) is a longest contiguous subarray with equal number of 0 and 1. Recommend that you read this first:Algorithms to Find Maximum Size Subarray (Contiguous) Sum That Equals k. Then, the problem can be transformed to: Given an array of numbers that only co...
Here's a list of 30 coding interview patterns, each with one or two example LeetCode problems:1. Sliding WindowProblem 1: Minimum Size Subarray Sum Problem 2: Longest Substring Without Repeating Characters2. Two PointersProblem 1: 3Sum Problem 2: Container With Most Water...
Is there a way to extract a subarray from an array in vb, similar to MyArray[20:30] in other languages? is there any difference in now.touniversaltime now.UTCNow Is there any equivalent of the Access NZ Function in Visual Basic? Is there any way of viewing pdf files in my application...
DP and Binary Indexed tree problem help Can anyone please tell me the process how to solvethisproblem . Thanx in advance :)