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[算法] 循环有序数组查找非递归实现

非递归实现

#include<stdio.h>
#include
<stdlib.h>int isOrdered(int *array, int begin, int end) { return *(array+end) > *(array+begin) ? 1 : 0;}int contains(int *array, int begin, int end, int theNum) { return theNum >= *(array + begin) && theNum <= *(array + end) ? 1 : 0;}int CyclicOrderedBinarySearchNonRecursively(int *array, int begin, int end, int theNum) { while(end >= begin) { if(begin == end) { if(*(array + begin) == theNum) { return begin; } else { return -1; } } int mid = (begin + end) / 2; if(isOrdered(array, begin, mid)) { if(contains(array, begin, mid, theNum)) { end = mid; } else { begin = mid + 1; } } else { if(contains(array, mid + 1, end, theNum)) { begin = mid + 1; } else { end = mid; } } } return -1;}int search_nonrecursively(int *array, int n, int theNum) { return CyclicOrderedBinarySearchNonRecursively(array, 0, n - 1, theNum);}int main() { int *array = (int *)malloc(sizeof(int)*16); int i; for(i = 0; i < 16; i++) { *(array + i) = (i+5) % 16; }

int ret = search_nonrecursively(array, 16, 10); printf("%d\n", ret); return 0;}

 

[算法] 循环有序数组查找非递归实现