Compilare: user.cpp: In function ‘int main()’: user.cpp:81:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < words.size(); ++j) { ^ user.cpp:67:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &k); ^ user.cpp:70:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, MAX_LINE, fin); ^ user.cpp:77:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, MAX_LINE, fin); ^