foo.cc: In function 'Listnode* Insert(int*, int)':
foo.cc:19:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if(h = NULL){
         ^
foo.cc:28:13: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
     p->next = q;
     ~~~~~~~~^~~

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