/in/foo.cc: In function 'int main()':
/in/foo.cc:4:15: warning: unused variable 'j' [-Wunused-variable]
 int a,n,m,t,i,j,o;
               ^
/in/foo.cc:13:7: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
 cout<<t<<endl;
       ^