Preparando MOJI
You're given a matrix A of size n × n.
Let's call the matrix with nonnegative elements magic if it is symmetric (so aij = aji), aii = 0 and aij ≤ max(aik, ajk) for all triples i, j, k. Note that i, j, k do not need to be distinct.
Determine if the matrix is magic.
As the input/output can reach very huge size it is recommended to use fast input/output methods: for example, prefer to use scanf/printf instead of cin/cout in C++, prefer to use BufferedReader/PrintWriter instead of Scanner/System.out in Java.
The first line contains integer n (1 ≤ n ≤ 2500) — the size of the matrix A.
Each of the next n lines contains n integers aij (0 ≤ aij < 109) — the elements of the matrix A.
Note that the given matrix not necessarily is symmetric and can be arbitrary.
Print ''MAGIC" (without quotes) if the given matrix A is magic. Otherwise print ''NOT MAGIC".
3
0 1 2
1 0 2
2 2 0
MAGIC
2
0 1
2 3
NOT MAGIC
4
0 1 2 3
1 0 3 4
2 3 0 5
3 4 5 0
NOT MAGIC
Informação
Provedor Codeforces
Código CF632F
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Datas 09/05/2023 09:04:35
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