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4421:Bit Magic

题目描述
Yesterday, my teacher taught me about bit operators: and (&), or (|), xor (^). I generated a number table a[N], and wrote a program to calculate the matrix table b[N][N] using three kinds of bit operator. I thought my achievement would get teacher's attention.
The key function is the code showed below.

There is no doubt that my teacher raised lots of interests in my work and was surprised to my talented programming skills. After deeply thinking, he came up with another problem: if we have the matrix table b[N][N] at first, can you check whether corresponding number table a[N] exists?
输入解释
There are multiple test cases.
For each test case, the first line contains an integer N, indicating the size of the matrix. (1 <= N <= 500).
The next N lines, each line contains N integers, the jth integer in ith line indicating the element b[i][j] of matrix. (0 <= b[i][j] <= 2 31 - 1)
输出解释
For each test case, output "YES" if corresponding number table a[N] exists; otherwise output "NO".
输入样例
2
0 4
4 0
3
0 1 24
1 0 86
24 86 0
输出样例
YES
NO
来自杭电HDUOJ的附加信息
Recommend zhuyuanchen520

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-4421

最后修改于 2020-10-25T23:13:21+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
4000/2000MS(Java/Others) 32768/32768K(Java/Others)