分治思想,同时返回一个数组的最大值和最小值.

1,实例代码:

#include <iostream>
using namespace std;

void maxmin(int a[],int low,int high,int& max,int& min) //引用作为参数的强大作用
{
    int k, max1,min1,max2,min2;
    if(high-low==1||high-low==0)
    {
        a[low]>a[high]? (max = a[low], min = a[high]):(max = a[high], min = a[low]);
    }
    else
    {

        k=(high+low)/2;
        maxmin( a,low,k,max1,min1);
        maxmin( a,k+1,high,max2,min2);
        max=max1>max2? max1:max2;
        min=min1<min2? min1:min2;
    }
}

int main()
{
    int max,min;
    int data[]={8,3,6,2,1,9,4,5,7};
    int num=sizeof(data)/sizeof(data[0]);
    maxmin(data,0,num-1,max,min);
    cout<<"最大值:"<<max<<endl;
    cout<<"最小值:"<<min<<endl;
    return 0;
}