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Lỗi biên dịch:

Main.cc: In function ‘int drasc(int*, int, int)’:
Main.cc:25:13: error: call of overloaded ‘swap(int&, int&)’ is ambiguous
   25 |         swap(a[t], a[b]);
      |         ~~~~^~~~~~~~~~~~
Main.cc:4:6: note: candidate: ‘void swap(int, int)’
    4 | void swap(int x,int y);
      |      ^~~~
Main.cc:10:6: note: candidate: ‘void swap(int&, int&)’
   10 | void swap(int &x,int &y){
      |      ^~~~
Main.cc:29:9: error: call of overloaded ‘swap(int&, int&)’ is ambiguous
   29 |     swap(a[t], a[r]);
      |     ~~~~^~~~~~~~~~~~
Main.cc:4:6: note: candidate: ‘void swap(int, int)’
    4 | void swap(int x,int y);
      |      ^~~~
Main.cc:10:6: note: candidate: ‘void swap(int&, int&)’
   10 | void swap(int &x,int &y){
      |      ^~~~
Main.cc: In function ‘int main()’:
Main.cc:46:13: warning: unused variable ‘sum’ [-Wunused-variable]
   46 |         int sum = 0;
      |             ^~~
Main.cc:49:13: warning: unused variable ‘count’ [-Wunused-variable]
   49 |         int count = 0;
      |             ^~~~~