Compilare: main.cpp: In function 'void dfs(int)': main.cpp:128:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0;i < muchii[nod].size();i++){ ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:156:13: warning: unused variable 'sol' [-Wunused-variable] int sol = 0,r = a; ^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:28:29: 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); ^