Runtime Error
/in/foo.cc: In function 'void presolve()':
/in/foo.cc:11:16: warning: unused variable 's' [-Wunused-variable]
r=1<<n;int s;
^
/in/foo.cc: In function 'void presolve()':
/in/foo.cc:11:16: warning: unused variable 's' [-Wunused-variable]
r=1<<n;int s;
^
