python s12 day2 入门知识拾遗 http://www.cnblogs.com/wupeiqi/articles/4906230.html 基本数据类型 注:查看对象相关成员 var,type,dir 一.整数 如: 18.73.84 每一个整数都具备如下功能: class int(object): """ int(x=0) -> int or long int(x, base=10) -> int or long Convert a number…
1.day2题目 1.判断下列逻辑语句的True,False. 1)1 > 1 or 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6 2)not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6 2.求出下列逻辑语句的值. 1),8 or 3 and 4 or 2 and 0 or 9 and 7 2),0 or 2 and 3 and…
Day2:求1000以内的素数 #素数:除了1和它本身外,不能被其他自然数整除 #判断素数的方法:1).暴力法:从2到n-1每个数均整除进行判断 2).开根号法:从2到sqrt(n)均做整除判断(原因:一个合数一定含有小于自己平方根的质因子) 方法1: prime = [] #存储素数 for m in range(2,1001): state = 1 #创建标签来判断状态 for i in range(2,m - 1): if m % i == 0: state = 0 break if…
最近帮一个客户搭建跨洋的合并复制,由于数据库非常大,跨洋网络条件不稳定,因此只能通过备份初始化,在初始化完成后向海外订阅端插入数据时发现报出如下错误: Msg 548, Level 16, State 2, Line 2 The insert failed. It conflicted with an identity range check constraint in database %s, replicated table %s, column %s. If the identit…
在Java位运算总结-leetcode题目博文中总结了Java提供的按位运算操作符,今天又碰到LeetCode中一道按位操作的题目 Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you should return 4. 题意:…
Assume you have an array of length n initialized with all 0's and are given k update operations. Each operation is represented as a triplet: [startIndex, endIndex, inc] which increments each element of subarray A[startIndex ... endIndex] (startIndex…
Given an integer array nums, return the number of range sums that lie in [lower, upper] inclusive.Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j (i ≤ j), inclusive. Note:A naive algorithm of O(n2) is trivial.…
Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). The above rectangle (with the red border) is defined by (row1, col1) = (2, 1) and (row2, co…
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums by updating the element at index i to val. Example: Given nums = [1, 3, 5] sumRange(0, 2) -> 9 update(1, 2…
Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). The above rectangle (with the red border) is defined by (row1, col1) = (2, 1) and (row2, co…
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nums = [-2, 0, 3, -5, 2, -1] sumRange(0, 2) -> 1 sumRange(2, 5) -> -1 sumRange(0, 5) -> -3 Note: You may assume that the array do…
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you should return 4. Credits:Special thanks to @amrsaqr for adding this problem and creatin…
