Resistance
Description:
H.L. is preparing a circuit for the next coming physical experiment. His circuit consists of N nodes, numbered 1 to N, which are connected by wires with certain resistance. H.L is curious about the equivalent resistance between Node 1 and Node N.
Input:
The first line contains two positive integers N and M, the number of nodes and wires in the circuit.( N, M ≤ 100)
The next M lines, each describe a wire connection by three integers X, Y, R which indicates that between Node X and Node Y, there is a wire with resistance of R ohm.
Output:
The equivalent resistance rounded after the second decimal place.
Sample Input:
2 2 1 2 1 1 2 1
Sample Output:
0.50
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