Compilare: main.cpp: In function 'int main()': main.cpp:87:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; ++i) ~~^~~~ main.cpp:84:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.out", "w", stdout); ^ main.cpp: In member function 'char InParser::get_char()': main.cpp:57:44: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, BUFFSIZE, fin); ^