foo.cc: In function 'int main()':
foo.cc:18:19: error: 'N' was not declared in this scope
   18 |  struct student s[N];
      |                   ^
foo.cc:21:26: error: 's' was not declared in this scope
   21 |  {  scanf("%d %s %d %f",&s[i].num,s[i].name,&s[i].sex,&s[i].score);
      |                          ^
foo.cc:26:8: error: 's' was not declared in this scope
   26 |     if(s[i].sex==0 && s[i].score>s[sex0].score )
      |        ^
foo.cc:30:9: error: 's' was not declared in this scope
   30 |      if(s[i].sex==1 && s[i].score>s[sex1].score )
      |         ^
foo.cc:36:16: error: 's' was not declared in this scope
   36 |  printf("%.1f",s[sex1].score);
      |                ^

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