Given an index?k, return the?kth?row of the Pascal's triangle. For example, given?k?= 3,Return?[1,3,3,1]. Note:Could you optimize your algorithm to use only?O(k) extra space? 分析:細節實現題。代碼如下: class Solution {
public:vector&
1.題目描述 ? Implement int sqrt(int x). ? Compute and return the square root of x. LEETCODE。2.解法分析 很明顯,用二分搜索可解,但是需要防止溢出,所以中間結果和上界下界都要用long long 來保存。 class Solution { public: int sqrt(int x) { /
Given an array of size?n, find the majority element. The majority element is the element that appears?more than?? n/2 ??times. You may assume that the array is non-empty and the majority element always exist in the array. 題目大意: 給定一個長度為n的
題目: leetCode,A robot is located at the top-left corner of a?m?x?n?grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the
題目: A message containing letters from?A-Z?is being encoded to numbers using the following mapping: 'A' -> 1
'B' -> 2
...
'Z' -> 26 Given an encoded message containing digits, determine the total number of ways to