44. Linear Search #3
Given n numbers. Write a program that finds the index of the 1 that occurs at the k-th position among these numbers. Indexing starts at 0.
Input
The first line contains 2 natural numbers n and k, (1≤n≤105,k≤n).
The second line contains n numbers separated by spaces ai(1≤ai≤105).
Output
A single line with the solution of the problem. If the index does not exist, print −1 .
Sample input 1
3 1 2 1 1
Sample output 1
1
Sample input 2
3 2 2 1 1
Sample output 2
2
Sample input 3
3 3 2 1 1
Sample output 3
-1
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191 / 32
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1.0 s / 512 MB
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