Ek sorted array `nums` aur ek integer `target` diya gaya hai. Target ka index return karo. Agar na mile to -1 return karo. Solution O(log n) mein likhna hai.
Input: nums = [-1,0,3,5,9,12], target = 9
Output: 4
9 index 4 par hai.
Input: nums = [-1,0,3,5,9,12], target = 2
Output: -1
2 array mein nahi hai.
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