/in/foo.cc: In function 'int main()':
/in/foo.cc:93:7: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int src = id[sx][sy];
       ^~~
/in/foo.cc:93:7: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]