求助帮忙找找问题c语言

#include <stdio.h>
#include <stdlib.h>

int main()
{
  int n;
  scanf("%d",&n);
  typedef struct
  {
      char ming[10];
      int yuwen;
      int yingyu;
      int shuxue;
      int zongfen;
  }STUDENT;
  STUDENT stu[1001];
  for(int i=1;i<=n;i++)
  {
      scanf("%s %d %d %d",stu[i].ming,&stu[i].yuwen,&stu[i].yingyu,&stu[i].shuxue);
     stu[i].zongfen=stu[i].yingyu+stu[i].yuwen+stu[i].shuxue;
  }
  for(int i=1;i<n;i++)
  {
      for(int j=i+1;j<=n;j++)
      {
          if(stu[i].yuwen-stu[j].yuwen<=5&&stu[i].yuwen-stu[j].yuwen>=-5&&stu[i].yingyu-stu[j].yingyu<=5&&stu[i].yingyu-stu[j].yingyu>=-5&&stu[i].shuxue-stu[j].shuxue<=5&&stu[i].shuxue-stu[j].shuxue>=-5&&stu[i].zongfen-stu[j].zongfen>=-10&&stu[i].zongfen-stu[j].zongfen<=10)
          {
              printf("%s %d %d %d\n%s %d %d %d\n",stu[i].ming,stu[i].yuwen,stu[i].yingyu,stu[i].shuxue,stu[j].ming,stu[j].yuwen,stu[j].yingyu,stu[j].shuxue);
          }
      }
  }
    return 0;
}