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Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:15:37: error: expected primary-expression before ‘)’ token
     scanf("%d %d %d %d",&N,&X,&Y,&Z,);
                                     ^
Main.cc:16:10: error: ‘a’ was not declared in this scope
     nhap(a,N);
          ^
Main.cc: In function ‘void nhap(int*, int)’:
Main.cc:8:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]); 
         ~~~~~^~~~~~~~~~~~