三个数的最大乘积
作者:互联网
整型数组nums,在数组中找出由三个数字组成的最大乘积,并输出这个乘积
乘积不会越界
public class MaxProduct {
public static void main(String[] args) {
System.out.println(sort(new int[]{-1,-2,-3,-4,-5,-6}));
System.out.println(getMaxMin(new int[]{1,2,3,4,5,6}));
}
public static int sort(int[] nums){
Arrays.sort(nums);//从小到大排序
int n = nums.length;
return Math.max(nums[0]*nums[1]*nums[n-1],nums[n-1]*nums[n-2]*nums[n-3]);
}
//线性扫描
public static int getMaxMin(int[] nums){
int min1 = Integer.MAX_VALUE,min2 = Integer.MAX_VALUE;
int max1 = Integer.MIN_VALUE,max2 = Integer.MIN_VALUE,max3 = Integer.MIN_VALUE;
for (int x:nums){
if (x<min1){
min2 = min1;
min1 = x;
}else if (x < min2){
min2 = x;
}
if (x>max1){
max3=max2;
max2=max1;
max1=x;
}else if (x>max2){
max3=max2;
max2=x;
}if (x>max1){
max3=x;
}
}
return Math.max(min1*min2*max1,max1*max2*max3);
}
}
标签:乘积,nums,int,max1,VALUE,max2,三个,Integer,最大 来源: https://www.cnblogs.com/cfs322/p/15074677.html