/in/foo.cc: In function 'int main()':
/in/foo.cc:118:5: warning: unused variable 'a' [-Wunused-variable]
 int a,b,i,j,q,x,y,t=clock();
     ^
/in/foo.cc:118:19: warning: unused variable 't' [-Wunused-variable]
 int a,b,i,j,q,x,y,t=clock();
                   ^