Compilare: user.cpp: In function ‘int main()’: user.cpp:124:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.size() > k) { ^ user.cpp: In function ‘int numar()’: user.cpp:80:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIMBUFF, fin); ^ user.cpp:89:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIMBUFF, fin); ^