原文见:https://leetcode.com/problems/couples-holding-hands/discuss/113362/JavaC%2B%2B-O(N)-solution-using-cyclic-swapping 一.问题引入 假设有一个长度为N的数组nums包含0—N-1的所有数字,但是数组中数字的顺序是随机的.可以任选两个数字进行交换,问最少要用多少步能够使数组满足 i==nums[i](即使数组递增有序). 二.Cyclic Swapping 使用cyclic sw…

https://leetcode.com/problems/first-missing-positive/ 给定一个长度为len的无序数组nums,找到其第一个丢失的正整数. 解法: 使用cyclic swapping algorithm.将满足条件  0 < num <= nums.size()的num放到下标为num的位置上,最终第一个nums[i]!=i的i即是最小的丢失的正整数. 代码将num放在下标为num-1的位置,思想是一样的. 注意交换的条件,避免死循环. class Solu…

给定一个数组nums,其中包含0--n中的n个数,找到数组中没有出现的那个数. 解法一:cyclic swapping algorithm class Solution { public: int missingNumber(vector<int>& nums) { nums.push_back(-); int len=nums.size(); ;i<len;i++) { && nums[i]!=i) swap(nums[i], nums[nums[i]]); }…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats. The people…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats. The people…

题目大意: 传送门 给两个数列${B_i}.{C_i}$,长度均为$n$,且${B_i}$循环移位线性无关,即不存在一组系数${X_i}$使得对于所有的$k$均有$\sum_{i=0}^{n-1} X_i  B_{k-i \mod n} =0$. 已知$C$是由$B$与$A$构造得到: (搬原图). 求所有合法的$A$序列. 题解: 首先把式子稍加化简会得到: 显然是个差分式,然后就会得到以下两种结果(以下$B_{i}$均为$B_{i\mod n}$): 问题是,这两个式子都是对的吗? 显然不是…

题目链接: C. Letters Cyclic Shift 题意: 现在一串小写的英文字符,每个字符可以变成它前边的字符即b-a,c-a,a-z这样,选一个字串变换,使得得到的字符串字典序最小; 思路: 贪心,尽量让前边的字典序变小; AC代码: #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #inclu…

简述:改变序列算法,参见http://www.cplusplus.com/reference/algorithm/?kw=algorithm 待解决问题:iterator_traits.std::move /* template <class BidirectionalIterator, class UnaryPredicate> BidirectionalIterator partition (BidirectionalIterator first, BidirectionalIterato…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853 There are N cities in our country, and M one-way roads connecting them. Now Little Tom wants to make several cyclic tours, which satisfy that, each cycle contain at least two cities, and each city b…

Sorting by Swapping Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 9514   Accepted: 5094 Description Given a permutation of numbers from 1 to n, we can always get the sequence 1, 2, 3, ..., n by swapping pairs of numbers. For example, i…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 1399    Accepted Submission(s): 712 Problem Description There are N cities in our country, and M one-way roads connecting them. Now Li…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Cyclic antimonotonic permutations Time Limit: 20000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description A permutation is a sequence of integers which contai…

Matrix Swapping II Time Limit: 9000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1543    Accepted Submission(s): 1036 Problem Description Given an N * M matrix with each entry equal to 0 or 1. We can find so…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16307    Accepted Submission(s): 6753 Problem Description CC always becomes very depressed at the end of this month, he has checke…

Cyclic Tour                                                                                Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)                                                                            …

Given an array of integers, find the first missing positive integer in linear time and constant space. In other words, find the lowest positive integer that does not exist in the array. The array can contain duplicates and negative numbers as well. F…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 11516    Accepted Submission(s): 4913 Problem Description CC always becomes very depressed at the end of this month, he has checke…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 15406    Accepted Submission(s): 6419 Problem Description CC always becomes very depressed at the end of this month, he has checke…

Bubble sort Bubble sort, sometimes incorrectly referred to as sinking sort, is a simple sorting algorithm that works by repeatedly stepping through the list to be sorted, comparing each pair of adjacent items and swapping them if they are in the wron…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 2399    Accepted Submission(s): 1231 Problem Description There are N cities in our country, and M one-way roads connecting them. Now L…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 1688    Accepted Submission(s): 859 Problem Description There are N cities in our country, and M one-way roads connecting them. Now Li…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4420    Accepted Submission(s): 2011 Problem Description CC always becomes very depressed at the end of this month, he has checked…

题目链接:https://vjudge.net/problem/HDU-3746 Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 10985    Accepted Submission(s): 4692 Problem Description CC always becomes very depresse…

题目传送门 /* KM: 相比HDOJ_1533,多了重边的处理,还有完美匹配的判定方法 */ #include <cstdio> #include <cmath> #include <algorithm> #include <cstring> using namespace std; ; const int INF = 0x3f3f3f3f; int x[MAXN], y[MAXN]; int w[MAXN][MAXN]; int visx[MAXN],…

CC always becomes very depressed at the end of this month, he has checked his credit card yesterday, without any surprise, there are only 99.9 yuan left. he is too distressed and thinking about how to tide over the last days. Being inspired by the en…

Matrix Swapping II Time Limit: 9000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1430    Accepted Submission(s): 950 Problem Description Given an N * M matrix with each entry equal to 0 or 1. We can find som…

http://acm.hdu.edu.cn/showproblem.php?pid=3746 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 9975    Accepted Submission(s): 4267 Problem Description CC always becomes very depressed at the e…

Cyclic Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 193    Accepted Submission(s): 125 Problem Description Count the number of cyclic permutations of length n with no continuous subsequence…

Cyclic Nacklace HDU 3746 KMP 循环节 题意 给你一个字符串,然后在字符串的末尾添加最少的字符,使这个字符串经过首尾链接后是一个由循环节构成的环. 解题思路 next[len]-len的差即是循环部分的长度. 这个是重点.这个题目自己开始没有想明白,看的博客,推荐这个. 代码实现 #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const i…

Cyclic Nacklace Problem Description CC always becomes very depressed at the end of this month, he has checked his credit card yesterday, without any surprise, there are only 99.9 yuan left. he is too distressed and thinking about how to tide over the…