Compilare: user.cpp: In function ‘void idem()’: user.cpp:93:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp: In function ‘void write(const char*)’: user.cpp:105:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sorted.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:119:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:129:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < curr.size(); i++) { ^ user.cpp:147:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < principal.size(); i++) { ^ user.cpp:116:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, Nadejde, f); ^