Any body got confused with "rotated by k positions". Does it mean k is known ?
I interpreted as k is known. So that answer should be O(1) in my opinion.
The expected answer is O(logn).
I think the interpretation should be rotated randomly by k position, k being, unknown.
What do others think ?
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#include <stdio.h> int find_s(int * a, int l) { int down = 0; int up = (l-1); int mid; while(down < up) { mid = (down+up)/2; printf("\n mid = %d",mid); if(a[mid] < a[mid - 1]) return (mid - 1); else if(a[mid] > a[down]) down = mid + 1; else up = mid ; } return -1; } int main() { int b[5] = {3,4,5,1,2}; int k; k = find_s(b,5); printf("\nk = %d\n",k); return 0; }Does it in O(logn) times. If k is provided , then you don't need the algorithm.
- Engineer1111 October 11, 2018