My Solution to A Distance Maximizing Problem

本文详细阐述了一个算法思想,用于在数组中寻找两个元素之间的最大差值,通过逐步添加元素并更新当前子数组的最小元素及最大差值得到最终结果。

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算法思想借鉴自:http://blog.youkuaiyun.com/clamreason/article/details/7904062

由2个元素开始作为初始条件,一个一个元素的添加进现有数组,保存2个变量,1个是currMin,就是当前处理的子数组的最小元素,一个是maxDiff,就是当前处理的子数组中最大的数对之差。如果当前添加的元素比min小,更新min,如果当前添加的元素减去min比maxDiff大,那么更新maxDiff。

/* 
LeetCode: A Distance Maximizing Problem
return value: max difference
parameters: arr - the array, range [0, len-1]
len - the length of the array
*/
int MaxDifference(int arr[], int len)
{
    if (!arr || len < 2)
        return 0;

    int currMin = arr[0] < arr[1] ? arr[0] : arr[1];    //current min
    int maxDiff = arr[1] - arr[0];                        //max difference

    for (int i = 2; i < len; i++)
    {
        if (maxDiff < arr[i] - currMin)
            maxDiff = arr[i] - currMin;

        if (arr[i] < currMin)
            currMin = arr[i];
    }

    return maxDiff;
}

 

 

 

 

 

EOF

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