def summer(alist,total): # Start outer loop to run through each item # start inner loop with two markers. One from start other from end. Do this till they meet. # Check the sum against the reuired number # if < required number increase leftmarker else decrease right marker length = len(alist) for i in range(1,length): leftmarker = 0 rightmarker = length -1 while leftmarker < rightmarker: currenttotal= alist[i-1] + alist[leftmarker] + alist[rightmarker] print(str(currenttotal)) if currenttotal == total: print(str(i-1) + ':' + str(leftmarker) + ':' + str(rightmarker)) return True if currenttotal < total : leftmarker +=1 elif currenttotal > total: rightmarker -= 1 print(str(leftmarker) +"::" + str(rightmarker)) return False lister=[1,4,7,8,9,13,16] print(summer(lister,31))
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