Accepted
/in/foo.cc: In function 'void spfa()':
/in/foo.cc:23:11: warning: unused variable 'b' [-Wunused-variable]
int a,b;
^
/in/foo.cc: In function 'void spfa()':
/in/foo.cc:23:11: warning: unused variable 'b' [-Wunused-variable]
int a,b;
^
