Compilare: user.cpp: In function ‘void add(int, unsigned int)’: user.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos <= N) ^ user.cpp: In function ‘int binsrc(unsigned int)’: user.cpp:84:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i+k <= N) ^