/in/foo.cc: In function 'int zero(const std::vector<int>&)':
/in/foo.cc:36:12: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  while(in[i]!=0) i++;
            ^
/in/foo.cc: In function 'void rebfs()':
/in/foo.cc:36:12: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  while(in[i]!=0) i++;
            ^
/in/foo.cc:35:6: note: 'i' was declared here
  int i;
      ^
/in/foo.cc: In function 'void bfs()':
/in/foo.cc:36:12: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  while(in[i]!=0) i++;
            ^
/in/foo.cc:35:6: note: 'i' was declared here
  int i;
      ^