/in/foo.cc: In function 'int main()':
/in/foo.cc:70:24: warning: unused variable 'a' [-Wunused-variable]
   if(a>b&&k==1)int t=a,a=b,b=t;
                        ^
/in/foo.cc:70:28: warning: unused variable 'b' [-Wunused-variable]
   if(a>b&&k==1)int t=a,a=b,b=t;
                            ^