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Lỗi biên dịch:

Main.cc: In function ‘void DemX(int)’:
Main.cc:7:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return dem;
            ^~~
Main.cc: In function ‘int main()’:
Main.cc:24:28: error: invalid use of void expression
         printf("%d",DemX(x));
                            ^
Main.cc:20:11: warning: unused variable ‘L’ [-Wunused-variable]
     int n,L,R,x;
           ^
Main.cc: In function ‘void NhapT(int&)’:
Main.cc:11:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
Main.cc: In function ‘void NhapKhoang(int)’:
Main.cc:17:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&L,&R);
         ~~~~~^~~~~~~~~~~~~~