#include <iostream> #include <stack> #include <queue> using namespace std; bool checkSP(int in[], int out[], int n) { queue<int> input; ;i<n;i++) input.push(in[i]); queue<int> output; ;i<n;i++) output.push(out[i]); stac…

题目: The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): "123" "132" "213" "231" "312" &q…

原题链接在这里:https://leetcode.com/problems/palindrome-permutation-ii/ 题目: Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb&…

B. Kyoya and Permutation Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/553/problem/B Description Let's define the permutation of length n as an array p = [p1, p2, ..., pn] consisting of n distinct integers from range from…

Let's define the permutation of length n as an array p = [p1, p2, ..., pn] consisting of n distinct integers from range from 1 to n. We say that this permutation maps value 1 into the value p1, value 2 into the value p2 and so on. Kyota Ootori has ju…

Swaps in Permutation You are given a permutation of the numbers 1, 2, ..., n and m pairs of positions (aj, bj). At each step you can choose a pair from the given positions and swap the numbers in that positions. What is the lexicographically maximal…

链接 http://codeforces.com/contest/123/problem/A 题目 You are given a string s, consisting of small Latin letters. Let's denote the length of the string as |s|. The characters in the string are numbered starting from 1. Your task is to find out if it is…

Description Ivan has an array consisting of n elements. Each of the elements is an integer from 1 to n. Recently Ivan learned about permutations and their lexicographical order. Now he wants to change (replace) minimum number of elements in his array…

Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result of a sequence of push and pop operations on an initially empty stack. Example 1: Input: pushed = [1,2,3,4,5], popped = [4,5,3,2,1]…

D. Make a Permutation! time limit per test: 2 seconds memory limit per test: 256 megabytes input: standard input output: standard output Ivan has an array consisting of n elements. Each of the elements is an integer from 1 to n. Recently Ivan learned…