1013. K-based Numbers. Version 3 Let’s consider K-based numbers, containing exactly N digits. We define a number to be valid if its K-based notation doesn’t contain two successive zeros. For example: 1010230 is a valid 7-digit number; 1000198 is not…

POJ 2342 Anniversary party / HDU 1520 Anniversary party / URAL 1039 Anniversary party(树型动态规划) Description There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of emp…

Find first K frequency numbers /* * Input: int[] A = {1, 1, 2, 3, 4, 5, 2}; k = 3 * return the highest frequency numbers. * return: [1, 2, 3] or [1, 2, 4] or [1, 2, 5] * */ 找出出现频率前k的数字 SOLUTION 1: 先将数字全放入一个map, key为数字,value为frequency, 对map排序,时间复杂度是Nl…

Given a target number, a non-negative integer k and an integer array A sorted in ascending order, find the k closest numbers to target in A, sorted in ascending order by the difference between the number and target. Otherwise, sorted in ascending ord…

Given an integer array, find the top k largest numbers in it.   Example Given [3,10,1000,-99,4,100] and k = 3. Return [1000, 100, 10]. 解法一: class Solution { public: /* * @param nums: an integer array * @param k: An integer * @return: the top k larges…

Given an integer array, find the top k largest numbers in it. Example Given [3,10,1000,-99,4,100] and k = 3.Return [1000, 100, 10]. 思路:由于需要按从大到小的顺序,因此直接用PriorityQueue即可,用Partition的方法的话还需要排序.直接用PriorityQueue 写的代码量少. class Solution { /* * @param nums a…

题目如下: Given an array of integers nums and a positive integer k, find whether it's possible to divide this array into sets of k consecutive numbersReturn True if its possible otherwise return False. Example 1: Input: nums = [1,2,3,3,4,4,5,6], k = 4 Ou…

题目链接 题意 :与1009一样,不过这个题的数据范围变大. 思路:因为数据范围变大,所以要用大数模拟,用java也行,大数模拟也没什么不过变成二维再做就行了呗.当然也可以先把所有的都进行打表,不过要用三维了就 . //URAL 1012 #include <stdio.h> #include <string.h> #include <iostream> using namespace std ; ]; ][] ; int main() { int n, k ; sca…

和1009相同,只是n达到了180位,可以模拟大数加和大数乘,这里用的java中的大数. import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner cin = new Scanner(System.in); while (cin.hasNext()) { int n = cin.nextInt(); int…

[本文链接] http://www.cnblogs.com/hellogiser/p/find-k-missing-numbers-from-1-to-n.html  [题目] 从1到n,共有n个数字(无序排列),每个数字只出现一次.现在随机拿走一个数字x,请给出最快的方法,找到这个数字.要求时间复杂度为O(n),空间复杂度为O(1).如果随机拿走k(k>=2)个数字呢? [分析] 题目给出的条件很强,数字是从1~n的数字,限制了数字的范围:每个数字只出现一次,限制了数字出现的次数:随即拿走了一…