题意见大佬:https://www.cnblogs.com/gj-Acit/archive/2013/08/17/3265502.html 题目大意很明确,交换图的某些行或者是某些列(可以都换),使得这个N*N的图对角线上全部都是1. 这里有一点需要说明,就是说题目的交换,其实是将原来图的某一行移到最后图的某一行,而不是指先交换两行,得到一个新图,再交换新图的两行.感觉这里比较坑. 这里先说明的一点就是,如果通过交换某些行没有办法的到解的话,那么只交换列 或者 既交换行又交换列 那也没办法得到解…

Swap Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2152    Accepted Submission(s): 764Special Judge Problem Description Given an N*N matrix with each entry equal to 0 or 1. You can swap any tw…

题意:如果可以交换行列,问主对角线能不能全为1 分析:要想主对角线全为1很明显要有N个行列不想同的点就行了,可以用二分图匹配计算出来多能有几个.如果小与N就不能.输出要是对的就行,不必和答案一样 ************************************************************************ #include<stdio.h> #include<algorithm> #include<; ; j<=N; j++)     …

 Swap Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 2819 Description Given an N*N matrix with each entry equal to 0 or 1. You can swap any two rows or any two columns. Can you find a way to ma…

Swap http://acm.hdu.edu.cn/showproblem.php?pid=2819 Special Judge Problem Description Given an N*N matrix with each entry equal to 0 or 1. You can swap any two rows or any two columns. Can you find a way to make all the diagonal entries equal to 1?  …

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=2819 题目大意:给你一个n*n的01矩阵,问是否可以通过任意交换整行或者整列使得正对角线上都是1. 解题思路: 按行列建图,求最大匹配,若最大匹配数<n,则肯定无解(矩阵的秩要等于n才有解).若有解,则肯定可以通过只交换行或者交换列得到.所以我们从i=1 to n检查link[i]=i(link[i]表示第i列的1对应的行号)是否成立,否则找到link[j]=i交换link[i]和link[j]并…

[题目链接] http://acm.hdu.edu.cn/showproblem.php?pid=2819 [题目大意] 给出一个棋盘,由白格子和黑格子组成,可以交换棋盘的行列, 使得其主对角线为黑格子,其余均为白格子,问是否能达成, 如果能达成输出交换步骤,否则输出-1 [题解] 我们对于所有的黑格子将其从属的行标和列标相连,做一遍二分图匹配, 对于每一行拥有的黑块如果不是在对应的列,我们就将这一行和对应的行互换, [代码] #include <cstdio> #include <al…

Swap Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2174    Accepted Submission(s): 774Special Judge Problem Description Given an N*N matrix with each entry equal to 0 or 1. You can swap any tw…

Given an N*N matrix with each entry equal to 0 or 1. You can swap any two rows or any two columns. Can you find a way to make all the diagonal entries equal to 1? InputThere are several test cases in the input. The first line of each test case is an…

题目链接:https://cn.vjudge.net/problem/HDU-2819 Given an N*N matrix with each entry equal to 0 or 1. You can swap any two rows or any two columns. Can you find a way to make all the diagonal entries equal to 1? InputThere are several test cases in the in…