Description Pattern lock security is generally used in Android handsets instead of a password. The pattern lock can be set by joining points on a 3 × 3 matrix in a chosen order. The points of the matrix are registered in a numbered order starting wit…

题目传送门 /* 题意:手机划屏解锁,一笔连通所有数字,输出所有可能的路径: DFS:全排列 + ok () 判断函数,去除一些不可能连通的点:) */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <string> #include <map> #include <cmath> #include…

3861 - Valid Pattern Lock Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu Submit Status Practice ZOJ 3861 Description Pattern lock security is generally used in Android handsets instead of a password. The pattern lock can b…

题目链接 http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3861 思路 先生成全排列,然后判断哪些情况不符合的,剔除就好了 代码中 init() 部分 就是 先指明 哪两个数字之间 是必须有另外一个数字的 AC代码 #include <cstdio> #include <cstring> #include <ctype.h> #include <cstdlib> #include &…

这道题目是队友写的,貌似是用暴力枚举出来. 题意:给出一组数,要求这组数在解锁的界面可能的滑动序列. 思路:按照是否能够直接到达建图,如1可以直接到2,但是1不能直接到3,因为中间必须经过一个2. 要注意的假如2已结访问过,那么1就可以直接到2. 建图DFS,图要更新. Source Code: #include <stdio.h> #include <string.h> ], ans[], n, vis[], k, fun[][]; ][] = { {}, {,,,,,,,,,}…

Valid Pattern Lock Time Limit: 2 Seconds      Memory Limit: 65536 KB Pattern lock security is generally used in Android handsets instead of a password. The pattern lock can be set by joining points on a 3 × 3 matrix in a chosen order. The points of t…

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3861 这道题当时没做出来,后来经过队友提醒才做出来. 3*3的九宫格,给你其中n个点按下面要求连起来: 1. 给你的n个点都要激活(至少经过一次) 2. 如果点A,B相连后要经过另一个点C,则C在序列中的位置必须在A,B之前 如 1 7 4是不合法的 3.线段相交是没关系的,如 7 6 9 4 我是直接生成n个数的全排列,然后在所有排列里面去掉不合法的. #include…

Description Do you know reverse Polish notation (RPN)? It is a known notation in the area of mathematics and computer science. It is also known as postfix notation since every operator in an expression follows all of its operands. Bob is a student in…

Description Edward has a set of n integers {a1, a2,...,an}. He randomly picks a nonempty subset {x1, x2,…,xm} (each nonempty subset has equal probability to be picked), and would like to know the expectation of [gcd(x1, x2,…,xm)]k. Note that gcd(x1, …

Description The 11th Zhejiang Provincial Collegiate Programming Contest is coming! As a problem setter, Edward is going to arrange the order of the problems. As we know, the arrangement will have a great effect on the result of the contest. For examp…