终于实现了，但是发现我这个思路无法找到第二大的数，现在想起了拼接数组的方法

选择第二大的数， 为什么用快速排序呢？  
用选择排序吧。/

#include <stdio.h>
#include <stdlib.h>
void Qsort(long general[],long startPos,long endPos)
{
    long temp,i,j;
    temp=general[startPos];
    i=startPos,j=endPos;
    while(i<j)
    {
    while(temp>=general[j]&&i<j)j--;
    general[i]=general[j];
    while(temp<=general[i]&&i<j)i++;
    general[j]=general[i];
    }
    general[i]=temp;
    if(i-1>startPos)Qsort(general,startPos,i-1);
    if(endPos>i+1)Qsort(general,i+1,endPos);
}
int main()
{
    long general[500000]={0},n,i,j,m=0,length=0,temp;
    scanf("%ld",&n);
    m=n-1
    for(i=0;i<n-1;i++)
    {
    for(j=0;j<m;j++)
    {
    scanf("%ld",&temp);
    general[length]=temp;
    length++;    
    }
    m--;
    }
    Qsort(general,0,length);
    printf("1");
    printf("%ld",general[1]);
    system("pause");
    return 0;
}

为什么以上代码无法通过编译

选排估计要超时

如果题目真如你所说, 选择排序处理这样的问题是 线性的/

现在的问题是，为什么上面的程序通不过编译呢。。。。。。。。。   你能帮我看看有什么语法问题吗？

sanguo.c: In function `main':
sanguo.c:24: error: syntax error before "for"
sanguo.c:24: error: syntax error before ')' token
sanguo.c:26: error: syntax error before ')' token
sanguo.c:24: warning: statement with no effect
sanguo.c:26: warning: statement with no effect
sanguo.c: At top level:
sanguo.c:32: error: syntax error before '--' token
sanguo.c:34: error: syntax error before numeric constant
sanguo.c:34: warning: type defaults to `int' in declaration of `Qsort'
sanguo.c:34: error: conflicting types for 'Qsort'
sanguo.c:4: error: previous definition of 'Qsort' was here
sanguo.c:34: warning: data definition has no type or storage class
sanguo.c:35: error: syntax error before string constant
sanguo.c:35: warning: type defaults to `int' in declaration of `printf'
sanguo.c:35: error: conflicting types for 'printf'
sanguo.c:35: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
sanguo.c:35: error: conflicting types for 'printf'
sanguo.c:35: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
sanguo.c:35: warning: data definition has no type or storage class
sanguo.c:36: error: syntax error before string constant
sanguo.c:36: warning: type defaults to `int' in declaration of `printf'
sanguo.c:36: warning: data definition has no type or storage class
sanguo.c:37: error: syntax error before string constant
sanguo.c:37: warning: type defaults to `int' in declaration of `system'
sanguo.c:37: warning: data definition has no type or storage class
编译结束但存在 12 错误 和 12 警告

学习.学习..

m=n-1
for(i=0;i<n-1;i++)

分号？？