[CF1151E]Number of Components 题面 CF 题解 联通块个数=点数-边数. 然后把边全部挂在较小的权值上. 考虑从小往大枚举左端点,等价于每次删掉一个元素,那么删去点数,加上边数,修改一下当前值就行了. 这个东西对于任意形态的树都可以做. #include<iostream> #include<cstdio> #include<vector> using namespace std; #define ll long long #define…

[BZOJ3275]Number Description 有N个正整数,需要从中选出一些数,使这些数的和最大.若两个数a,b同时满足以下条件,则a,b不能同时被选1:存在正整数C,使a*a+b*b=c*c2:gcd(a,b)=1 Input 第一行一个正整数n,表示数的个数. 第二行n个正整数a1,a2,?an. Output 最大的和. Sample Input 5 3 4 5 6 7 Sample Output 22 HINT n<=3000. 题解:先是无脑码了个最小割,果断WA了,看网上…

[05]Number图解  …

题目描述: Write a function that takes an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight). For example, the 32-bit integer '11' has binary representation 00000000000000000000000000001011, so the function shoul…

Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by…

KMP算法 KMP的基处题目,数字数组的KMP算法应用. 主要是next[]数组的构造,next[]存储的是字符的当前字串,与子串前字符匹配的字符数. 移动位数 = 已匹配的字符数 - 对应的部分匹配值 Problem Description Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N <= 100…

SQL> SELECT TO_CHAR(, '9990.00') A, TO_CHAR(5.8, '9990.00') B, TO_CHAR(., '9990.00') C FROM dual; A B C ---------------- ---------------- ---------------- 123.00 5.80 0.46 SQL> ‘9990.00’表示转换的数字的最大数,可根据自身表里面的number字段大小,进行调整.比如number(19,2)可变成 : ltrim(…

定义和用法 Number() 函数把对象的值转换为数字. 语法 Number(object):参数必须是对象 如果参数是 Date 对象,Number() 返回从 1970 年 1 月 1 日至今的毫秒数.返回值 如果对象的值无法转换为数字,那么 Number() 函数返回 NaN. 实例 ① var arr = [1000]; var val = 1; console.log(arr+val); ② var arr = ['1000']; var val = 1; console.log(ar…

Number of Islands 问题描写叙述 Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the gr…

http://poj.org/problem?id=1019 (题目链接) 题意 给出一个数:1 12 123 1234 12345 123456 1234567 12345678 123456789 12345678910(当然中间是没有空格的)求它从左往右第n位上是多少. solution 水题一道.我们可以发现,这个数可以分成若干串数,记为i,那么每串数i就是从1~i.我们可以用数组x[i]来记录串i所占的空间也就是位数,数组sum[i]来记录串i的末尾位于整个串中的哪个位置. 对于每次输…