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Given an array containing n distinct numbers taken from 0, 1, 2, …, n, find the one that is missing from the array. Example 1: Input: [3,0,1] Output: 2 Example 2： Input: [9,6,4,2,3,5,7,0,1] ...

Given a non-negative integer numRows, generate the first numRows of Pascal’s triangle. Given a non-negative integer numRows, generate the first numRows of Pascal’s triangle. Example: Input: 5 O...

Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of ...

Reverse bits of a given 32 bits unsigned integer. Example Input: 43261596 Output: 964176192 Explanation: 43261596 represented in binary as 00000010100101000001111010011100, return ...

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note: 0 ≤ x, y <...

Write a function that takes an unsigned integer and returns the number of ‘1’ bits it has (also known as the Hamming weight). Example 1: Input: 11 Output: 3 Explanation: Integer 11 has binary repr...

Given two arrays, write a function to compute their intersection. Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2]. Note: Each element in the result should appear as many time...

以前碰到cin TLE的时候总是傻乎乎地改成scanf，甚至还相信过C++在IO方面效率低下的鬼话，殊不知这只是C++为了兼容C而采取的保守措施 tie tie是将两个stream绑定的函数，空参数的话返回当前的输出流指针 #include <iostream> #include <fstream> ///////////////////////////Su...

错误C4146的解决方法 error C4146: 一元负运算符应用于无符号类型，结果仍为无符号类型； 那么什么情况下会遇见这种错误呢，例如下代码： 错误代码1： int number = -2147483648; //error C4146: 一元负运算符应用于无符号类型，结果仍为无符号类型； 错误代码2： if ( num >= -2147483648 &amp...

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (i.e., buy on...

Given an array, rotate the array to the right by k steps, where k is non-negative. Example 1: Input: [1,2,3,4,5,6,7] and k = 3 Output: [5,6,7,1,2,3,4] Explanation: rotate 1 steps to the right:...

Given a linked list, remove the n-th node from the end of list and return its head. Example: Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end...

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element i...