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CodeForces 237C Primes on Interval
DescriptionYou've decided to carry out a survey in the theory of prime numbers. Let us remind you that a prime number is a positive integer that has e...
分类:其他好文   时间:2014-07-27 22:31:39    阅读次数:809
USACO humble
用set构造,优先队列和堆也可以 /* ID:kevin_s1 PROG:humble LANG:C++ */ #include #include #include #include #include #include #include #include #include #include #include using namespace std; #defi...
分类:其他好文   时间:2014-07-27 11:22:12    阅读次数:141
hdoj 1492 The number of divisors(约数) about Humble Numbers 【数论】【质因子分解 求和】
定理:一个正整数 n 可以用素因子唯一表示为 p1^r1 * p2^r2 * ... pk^rk (其中 pi 为素数) , 那么这个数的因子的个数就是,(r1+1)*(r2+1)*...*(rk+1). 理解:为什么是加1之后再相乘,因为一个数的的因子数至少为1和他自身,但因为r1,r2。。可以为0,所以因子的个数为(r1+1)。。。 拓展一下: 定理1: 一个正整数 n 可以用素...
分类:其他好文   时间:2014-07-26 15:32:46    阅读次数:194
Leetcode--Combination Sum II
Problem Description: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only b...
分类:其他好文   时间:2014-07-26 15:24:02    阅读次数:252
kmp
Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 #includeintnext[10005];ints[1000005],p[10005];intn,m;void...
分类:其他好文   时间:2014-07-26 13:46:34    阅读次数:297
[LeetCode] Minimum Path Sum
Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path.N...
分类:其他好文   时间:2014-07-26 01:42:16    阅读次数:263
[LeetCode] Permutations
Given a collection of numbers, return all possible permutations.For example, [1,2,3] have the following permutations: [1,2,3], [1,3,2], [2,1,3], [2,3,...
分类:其他好文   时间:2014-07-26 01:38:56    阅读次数:214
【leetcode刷题笔记】Multiply Strings
Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-nega...
分类:其他好文   时间:2014-07-26 00:23:26    阅读次数:242
Phone List
Time Limit:1000MSMemory Limit:65536KB64bit IO Format:%I64d & %I64uSubmitStatusDescriptionGiven a list of phone numbers, determine if it is consistent ...
分类:其他好文   时间:2014-07-26 00:00:26    阅读次数:480
LeetCode "Longest Consecutive Sequence"
Comparison-based sorting takes O(nlgn), so hashset is a good idea. After keeping records of all numbers in the hashset, you start checking each number...
分类:其他好文   时间:2014-07-25 03:40:54    阅读次数:305
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