Mahi is modeling a network at a research lab where most hops cost 1 but special "fast lanes" cost 0, and needs minimum-cost reachability between many node pairs.
What your program reads
Line1: N M. Line2: N integers (jump distances). Line3: Q. Next Q lines: start end.
What your program prints
Minimum cost per query, or -1.
Limits
1 ≤ N ≤ 10^5
Example input
5 2 2 3 1 1 1 1 1 5
Expected output
1
main.c
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