c - 不使用数组从 n 个数中取最大的三个数

Question

我需要在不使用数组、列表之类的结构的情况下从 n 个数字中识别出最大的三个元素，我不应该使用任何排序逻辑。我在 C 程序中做了类似的事情。有什么方法可以更有效地做到这一点？

#include <stdio.h>
    int main()
    {
       int n;
       scanf("%d",&n);
       int number;
       scanf("%d",&number);
       int firstMax, secondMax, thirdMax;
       firstMax = secondMax = thirdMax =number;
       for(int i = 1; i<n ; i++){
           scanf("%d",&number);
           if(number > firstMax){
               thirdMax = secondMax;
               secondMax = firstMax;
               firstMax = number;
           }
           else if(number > secondMax){
               thirdMax = secondMax;
               secondMax = number;
           }
           else if(number > thirdMax){
               thirdMax = number;
           }
       }
       printf("%d %d %d",firstMax, secondMax, thirdMax);
       return 0;
    }

Answer 1

您可以从与thirdMax 比较开始。如果这是错误的，则无需考虑所有其他内容。

if (number > thirdMax)
{
    if (number > secondMax)
    {
        thirdMax = secondMax;
        if (number > firstMax )
        {
            secondMax = firstMax;
            firstMax = number;
        }
        else
        {
            secondMax = number;
        }
    }
    else
    {
        thirdMax = number;
    }
}