Compilare: main.cpp: In constructor 'BipartiteMatching::BipartiteMatching(std::vector<std::vector<int> >&)': main.cpp:70:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<graph.size(); ++i) ~^~~~~~~~~~~~~ main.cpp:72:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<graph.size(); ++i) ~^~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:13:29: 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); ^