Tournament-graph

1000ms

262144K

Description:

In this problem you have to build tournament graph, consisting of n vertices, such, that for any oriented pair of vertices (v, u) (v ≠ u) there exists a path from vertex v to vertex u consisting of no more then two edges.

A directed graph without self-loops is a tournament, if there is exactly one edge between any two distinct vertices (in one out of two possible directions).

Input:

The first line contains an integer n (3 ≤ n ≤ 1000), the number of the graph's vertices.

Output:

Print -1 if there is no graph, satisfying the described conditions.

Otherwise, print n lines with n integers in each. The numbers should be separated with spaces. That is adjacency matrix a of the found tournament. Consider the graph vertices to be numbered with integers from 1 to n. Then a_v, u = 0, if there is no edge from v to u, and a_v, u = 1 if there is one.

As the output graph has to be a tournament, following equalities must be satisfied:

a_v, u + a_u, v = 1 for each v, u (1 ≤ v, u ≤ n; v ≠ u);
a_v, v = 0 for each v (1 ≤ v ≤ n).

Sample Input:

Sample Output:

0 1 0
0 0 1
1 0 0

Sample Input:

Sample Output:

-1

Informação

Provedor Codeforces

Código CF323B