Tag: leetcode

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division …

Find the least number of perfect square numbers (1, 4, 9, 16, 25 …) which sum to the given integer n. For example, given n = 5, return 2 …

Given a singly linked list, determine if it is a palindrome. A palindrome is a string/number that mirrors itself, for example, 21312 reverse is also 21312. We are given …

Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array is rotated to . Pop …

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, …