Given an array of integers, find the shortest length subarray that has a sum greater than or equal to .
Input Specification
The first line will contain integers, .
The second line will contain integers .
Output Specification
Output the shortest length subarray that has a sum greater than or equal to . If there is no subarray, print -1
.
Sample Input
6 3
2 0 -1 2 -1 2
Sample Output
3
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