Compilare: user.cpp:13:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define INF (1 << 31 - 1) ^ user.cpp:54:26: note: in expansion of macro ‘INF’ Node head = new nod(-INF); ^ user.cpp:13:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] #define INF (1 << 31 - 1) ^ user.cpp:55:25: note: in expansion of macro ‘INF’ Node tail = new nod(INF); ^ user.cpp: In member function ‘void SkipList::nod::detach()’: user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(var i=0; i<next.size(); i++) { ^