Compilare: user.cpp: In function ‘void searchHash(int)’: user.cpp:174:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < usedPackages.size(); ++i) ^ user.cpp: In function ‘void readPackages()’: user.cpp:110:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld ", &package[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:223:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &n, &k); ^