crwen_的博客

class Solution { public void reverseString(char[] s) { int i = 0; int j = s.length - 1; while (i < j) { swap(s, i, j); i++; j--; ...

 Given a non-empty array of digits representing a non-negative integer, plus one to the integer.  The digits are stored such that the most significant digit is at the head of the list, and each elemen...

Largest Number At Least Twice of Others  In a given integer array nums, there is always exactly one largest element.  Find whether the largest element in the array is at least twice as much as every o...

Given an array of integers nums, write a method that returns the “pivot” index of this array. We define the pivot index as the index where the sum of the numbers to the left of the index is equal to ...