如果待查找序列 seq 中有多个元素与 key 相等,那么,binary_search 函数只是返回其中一个元素的索引。比如,序列 seq 为 [1,2,5,5,5,5,7,8,9], key 的值为 5。 中间元素 seq[4] == 5,所以结果为 4。如果要返回从左到右第一个与 key 相等的元素的索引(此索引为 2),该如何做呢? 我们回想一下 ...
defbinary_search_recursion(lst, value, low, high):ifhigh <low:returnNone mid= (low + high) // 2iflst[mid] >value:returnbinary_search_recursion(lst, value, low, mid-1)eliflst[mid] <value:returnbinary_search_recursion(lst, value, mid+1, high)else:returnmid 2、循环的方法实现二分法 de...
Search In a Big Sorted ArrayGiven a big sorted array with positive integers sorted by ascending order. The array is so big so that you can not get the length of the whole array directly, and you can only access the kth number by ArrayReader.get(k) (or ArrayReader->get(k) for C++)...
# Python 3 program for recursive binary search.# Returns index of x in arr if present, else NonedefbinarySearch_recursion(arr:list,left,right,x):# base caseifleft<=right:mid=(left+right)//2# if element is smaller than mid, then it can only# be present in left subarrayifx<arr[mid]:...
Binary Search The last page covered some simple examples of recursion, which could have been coded with loops just as easily. In other cases, using recursion is considerably more 'natural' than using loops. The Algorithm You are given an array sorted in increasing order and would like to ...
key: root.right = self.__insert(root.right, key) else: print key, 'is already in tree' return root ##non-recursion ## def insert(self, key): ## if not self.root: ## self.root = tree_node(key) ## else: ## cur = self.root ## while True: ## if key < cur.key: ## ...
I suggest you`d better use recursion to achieve it again : int*binary_search_rec(int*array,int*low,int*high,intkey){if(low>high)returnNULL;// No find !int*mid=low+((high-low)>>1);printf("binary_search_rec: mid = %d\n",mid-low);if(key<*mid)returnbinary_search_rec(array,low...
binary file- (computer science) a computer file containing machine-readable information that must be read by an application; characters use all 8 bits of each byte computer science,computing- the branch of engineering science that studies (with the aid of computers) computable processes and structur...
The binary search begins by comparing the searched element with the middle element of the array. Since ‘mid’ calculate for every iteration or recursion, we divide the array into half and then try to solve the problem. If the searched value is less than the element in the middle of the ...
Some of the problems in this article use plain binary trees, and some use binary search trees. In any case, the problems concentrate on the combination of pointers and recursion. (See the articles linked above for pointer articles that do not emphasize recursion.) ...