/in/foo.cc: In function 'int init()':
/in/foo.cc:13:1: warning: no return statement in function returning non-void [-Wreturn-type]
 } 
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:48:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(sz[0][i]='0') bfs(0,i);
     ~~~~~~~~^~~~
/in/foo.cc:49:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(sz[i][0]='0') bfs(i,0);
     ~~~~~~~~^~~~
/in/foo.cc:50:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(sz[9][i]='0') bfs(9,i);
     ~~~~~~~~^~~~
/in/foo.cc:51:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(sz[i][9]='0') bfs(i,9);
     ~~~~~~~~^~~~