CNoodle

[LeetCode] 2588. Count the Number of Beautiful Subarrays

You are given a 0-indexed integer array nums. In one operation, you can:Choose two different indices i and j such that 0 <= i, j < nums.length.Choose a non-negative integer k such that the

2025-03-05

#leetcode #java #hashmap #prefix sum #bit manipulation

[LeetCode] 2506. Count Pairs Of Similar Strings

You are given a 0-indexed string array words. Two strings are similar if they consist of the same characters. For example, “abca” and “cba” are similar since both consist of characters ‘a’, ‘b’, and ‘

2025-02-21

#leetcode #java #array #hashmap #two sum #counting sort #string

[LeetCode] 2658. Maximum Number of Fish in a Grid

You are given a 0-indexed 2D matrix grid of size m x n, where (r, c) represents:A land cell if grid[r][c] = 0, orA water cell containing grid[r][c] fish, if grid[r][c] > 0.A fisher can start a

2025-02-16

#leetcode #bfs #dfs #java #flood fill

[LeetCode] 2342. Max Sum of a Pair With Equal Sum of Digits

You are given a 0-indexed array nums consisting of positive integers. You can choose two indices i and j, such that i != j, and the sum of digits of the number nums[i] is equal to that of nums[j]

2025-02-11

#leetcode #java #array #hashmap #two sum

[LeetCode] 2364. Count Number of Bad Pairs

You are given a 0-indexed integer array nums. A pair of indices (i, j) is a bad pair if i < j and j - i != nums[j] - nums[i]. Return the total number of bad pairs in nums. Example 1:Input: num

2025-02-08

#leetcode #java #array #hashmap #two sum

[LeetCode] 2349. Design a Number Container System

Design a number container system that can do the following:Insert or Replace a number at the given index in the system.Return the smallest index for the given number in the system. Implement the Numbe

2025-02-08

#leetcode #java #hashmap #treemap #design

[LeetCode] 2683. Neighboring Bitwise XOR

A 0-indexed array derived with length n is derived by computing the bitwise XOR (⊕) of adjacent values in a binary array original of length n. Specifically, for each index i in the range [0, n - 1]:If

2025-01-26

#leetcode #java #prefix sum #bit manipulation

[LeetCode] 1310. XOR Queries of a Subarray

You are given an array arr of positive integers. You are also given the array queries where queries[i] = [left, right]. For each query i compute the XOR of elements from left to right (that is, a

2025-01-25

#leetcode #java #array #prefix sum #bit manipulation

[LeetCode] 2909. Minimum Sum of Mountain Triplets II

You are given a 0-indexed array nums of integers. A triplet of indices (i, j, k) is a mountain if:i < j < knums[i] < nums[j] and nums[k] < nums[j]Return the minimum possible sum of a mount

2025-01-17

#leetcode #java #array #hashmap #two sum

[LeetCode] 3258. Count Substrings That Satisfy K-Constraint I

You are given a binary string s and an integer k. A binary string satisfies the k-constraint if either of the following conditions holds:The number of 0’s in the string is at most k.The number of 1’s

2025-01-08

#leetcode #java #sliding window #string