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23. Sum Root to Leaf Numbers
思想: 分三种情况: 1. 当前结点为空,返回0. 2. 叶子结点, 返回当前值. 3. 父结点,返回左右两个 path 值的和。
分类:其他好文   时间:2014-08-27 00:22:06    阅读次数:194
HDU1058 Humble Numbers 【数论】
Humble Numbers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 17407    Accepted Submission(s): 7565 Problem Description A number w...
分类:其他好文   时间:2014-08-26 21:28:16    阅读次数:296
UVA - 1404 Prime k-tuple (素数筛选)
Description {p1,..., pk : p1 < p2 pk} is called a prime k -tuple of distance s if p1, p2,..., pk are consecutive prime numbers and pk - p1 = s . For example, with k = 4 , s = 8 , {11, 13, 1...
分类:其他好文   时间:2014-08-26 17:25:13    阅读次数:217
poj 1724
ROADS Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10844   Accepted: 3994 Description N cities named with numbers 1 ... N are connected with one-way roads...
分类:其他好文   时间:2014-08-26 17:19:46    阅读次数:242
Codeforce 401D Roman and Numbers[数位DP+状态压缩]
给出数n和m,求n的所有排列中,模m得0的有多少个 n (1?≤?n?18) and m (1?≤?m?≤?100). 暴力法我们直接枚举n的所有排列,显然18!超时。 考虑怎么dp 假设给了我们数n=23765 显然有 (237%m*10+6)%m=2376%m (367%m*10+2)%m=3672 我们很自然的想到了 这样的状态转移 dp[i][k] i代表取...
分类:其他好文   时间:2014-08-26 15:38:36    阅读次数:216
UVA - 1415 Gauss Prime
Description In the late 1700s', Gauss, a famous mathematician, found a special kind of numbers. These integers are all in the form: a + b .The sum and multiplication ofthese integers can be natura...
分类:其他好文   时间:2014-08-26 11:46:25    阅读次数:237
CodeForces 34C Page Numbers
#include #include #include #include #include #include #include #include #include #include #define inf 0x3f3f3f3f #pragma comment(linker, "/STACK:16777216") #define eps 1e-6 #define ll long l...
分类:其他好文   时间:2014-08-25 22:59:45    阅读次数:524
LeetCode: Triangle
LeetCode: TriangleGiven a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For exa...
分类:其他好文   时间:2014-08-25 22:48:14    阅读次数:306
[LeetCode] Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl...
分类:其他好文   时间:2014-08-25 22:43:04    阅读次数:266
LeetCode: Valid Palindrome
LeetCode: Valid PalindromeGiven a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A...
分类:其他好文   时间:2014-08-25 22:31:25    阅读次数:216
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