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Unformatted text preview: //found it if (x < arr[mid]) return binsearch(arr,x,left,mid-1); else return binsearch(arr,x,mid+1,right); } return -1; // Failed to find x } Note how the recursive version checks to see if we are at x, then it returns, otherwise it calls itself to solve a smaller problem (see also Epp, Sec. 11.5). Observe that, if a n denotes the worst-case run time, then a n = a n 2 + 1 , and a n O ( log n ) . Q3. Sec. 10.1, Ex. 19, 20, 33, 43 Q4. Sec. 10.2, Ex. 8, 12, 15, 18 Page 1 Last updated May 18, 2011 by M. Bajger...
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- Spring '08