C语言高手请帮个忙

帮我看下SORT1函数算法错在哪里.其它函数都没问题,这里不解决,下面的程序没心情去做啊!各位,拜托了!
#include<stdio.h>
#include<string.h>
#include<alloc.h>
#define LEN sizeof(struct stu)
struct stu
{int num;
char name[20];
char sex[5];
int score[10];
struct stu *next;};
int n=0;
struct stu *new(int i,int j)
{int a,b=1,flag;
struct stu *head,*p1,*p2;
head=p1=p2=NULL;
do
{n+=1;
flag=0;
p1=(struct stu *)malloc(LEN);
printf("Input stu%d ID:",b++);
scanf("%d",&p1->num);
printf("Input name:");
scanf("%s",p1->name);
printf("Input sex(boy or girl):");
loop:
scanf("%s",p1->sex);
if(strcmp(p1->sex,"boy")==0||strcmp(p1->sex,"girl")==0)flag=1;
if(flag==0)
{printf("Input error,input sex again:");
goto loop;}
printf("Input sc

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