Borderou de evaluare (job #3174)

Compilare: user.cpp: In function ‘std::string rot(std::string)’: user.cpp:9:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:23:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]