Compilare: main.cpp: In function 'void add_number(int, int)': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[bucket].size(); ++i) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void delete_number(int, int)': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[bucket].size(); ++i) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool check(int, int)': main.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[bucket].size(); ++i) ~~^~~~~~~~~~~~~~~~~~