Borderou de evaluare (job #290897)

Compilare: user.cpp: In function 'bool rable(int, std::string&)': user.cpp:11:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:13:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function 'std::string dif(std::string, std::string)': user.cpp:22:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function 'int main()': user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:66:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:73:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:84:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]