Borderou de evaluare (job #290892)

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:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:63:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:70:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:81:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]