How do i find the longest Path in a Graph , given with the number of points and the matrix of connections ;any code lan. is ok

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0 1 0 1 1 0 0 1
1 0 1 0 0 0 0 0
0 1 0 1 0 0 0 0
1 0 1 0 0 0 0 0
1 0 0 0 0 1 0 0
0 0 0 0 1 0 1 0
0 0 0 0 0 1 0 1
1 0 0 0 0 0 1 0

or..