Compilare: main.cpp: In function 'long long int applyRec(std::vector<std::pair<long long int, int> >)': main.cpp:60:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) { ~~^~~~~~~~~~~~ main.cpp: In function 'void moveRoot(int, int)': main.cpp:95:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[nod].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:107:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= sons.size(); ++i) { ~~^~~~~~~~~~~~~~ main.cpp:114:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sons.size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:155:29: 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); ^