Compilare: user.cpp: In function ‘int main()’: user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(ec1); ++i) ^ user.cpp:62:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(ec2); ++i) ^ user.cpp:12:9: warning: unused variable ‘num’ [-Wunused-variable] int num[1000], nec[1000]; ^ user.cpp:12:20: warning: unused variable ‘nec’ [-Wunused-variable] int num[1000], nec[1000]; ^