/in/foo.cc: In function 'void solve()':
/in/foo.cc:7:17: warning: 'posx' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int i,j,res,posx,posy;
                 ^~~~
/in/foo.cc:7:22: warning: 'posy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int i,j,res,posx,posy;
                      ^~~~