关于c:数据结构与算法-CPHP-二分查找实现

c 语言实现：

// c 语言实现二分搜寻
#include <stdio.h>

int binarySearch(int *p, int size, int target)
{
    int left  = 0;
    int right = size - 1;
    int mid = (left + right)/2;
    while(left <= right){mid = (left + right)/2;
        if (p[mid] == target)
        {return mid;}else{if (p[mid] > target)
            {right = mid - 1;}else{left = left + 1;}
        }
    }
    return -1;
}

int main()
{int nums[12] = {0,1,2,3,4,5,6,7,8,9,100,200};
    int size   = sizeof(nums) / sizeof(nums[0]);
    int res = binarySearch(nums, size,100);
    printf("res:%d\n",res);
    return 0;
}

PHP 实现：

//PHP 二分搜寻
// 这里应用了 PHP7 的强类型语法
function index(array $nums, int $target): int
{
    $left = 0;
    $len  = count($nums);
    $right= $len - 1;
    $ans  = -1;
    while ($left <= $right) {$mid = floor(($left + $right)/2);
        if ($target == $nums[$mid]) {return $mid;}elseif ($target > $nums[$mid]) {$left = $mid + 1;}else{$right = $mid - 1;}
    }
    return $ans;
}