Compilare: user.cpp: In function ‘int isInHash(int)’: user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[key].numbers.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void removeNumber(int)’: user.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[key].numbers.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void update(int, int)’: user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[key].numbers.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:68:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < elements.size()) { ~~^~~~~~~~~~~~~~~~~ user.cpp:92:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == elements.size()) { ~~^~~~~~~~~~~~~~~~~~ user.cpp:61:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(rFile, "%d %d %d", &n, &l, &g); ^ user.cpp:63:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(rFile, "%d", &x); ^