/in/foo.c: In function 'find':
/in/foo.c:13:12: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[j]<0&&max<a[j]){
      ~~~~~~^~~~~~~~~~
/in/foo.c: In function 'main':
/in/foo.c:13:12: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[j]<0&&max<a[j]){
      ~~~~~~^~~~~~~~~~
/in/foo.c:5:6: note: 'max' was declared here
  int max;
      ^~~
/in/foo.c:13:12: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[j]<0&&max<a[j]){
      ~~~~~~^~~~~~~~~~
/in/foo.c:5:6: note: 'max' was declared here
  int max;
      ^~~