Compilare: main.cpp: In function 'int main()': main.cpp:146:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < a.size();++i){ ~~^~~~~~~~~~ main.cpp:149:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < a.size() && a[j].first <= p){ ~~^~~~~~~~~~ main.cpp:164:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < a.size();++i){ ~~^~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:18:29: 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, 4096, fin); ^