/in/foo.cc: In function 'void init()':
/in/foo.cc:61:11: warning: unused variable 'c' [-Wunused-variable]
   int a,b,c,dis,ans=1e9;
           ^
/in/foo.cc:82:26: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   printf("%d %d\n",p,ans);
                          ^