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Given a graph with N nodes with each node numbered from 1 to N and M edges and a target vertex T. Find the number of different ways to reach target vertex T from vertex numbered 1.
2 <= N <= 2 * 10^5, M = min( 2 * 10^5, N * ( N - 1 ) / 2 )
Time limit — 5sec
Compute the answer modulo 10^9 + 7.
