Mã chấm: 268244

Main.cc: In function ‘int Leibniz(int)’:
Main.cc:19:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
Main.cc: At global scope:
Main.cc:20:1: error: expected unqualified-id before ‘return’
 return pi;
 ^~~~~~
Main.cc: In function ‘void nhap(int&)’:
Main.cc:7:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &n);
         ~~~~~^~~~~~~~~~