/in/foo.cc: In function 'int main()':
/in/foo.cc:46:11: warning: unused variable 'i' [-Wunused-variable]
     int T,i,j;
           ^
/in/foo.cc:46:13: warning: unused variable 'j' [-Wunused-variable]
     int T,i,j;
             ^
/in/foo.cc: In function 'int KMP()':
/in/foo.cc:42:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^