graph search algorithm - DFS

In this problem you have to find that if you start DFS from a node how many nodes are under this node in the DFS-tree and choose the maximum value of these for output.

Cause the input size is small and you are facing a DAG, don't think of complex algorithms to solve this problem, easily run DFS for each node and count how many nodes are invoked from this DFS and don't worry about cycles(there are no cycles in this problem). O(n^3)

data structures:

mat[101][101] = adjacency matrix

mark[101] = to mark which nodes are visited

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