Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for (i=0;i<apm[nod].size();i++){ ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:32: 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 , SZ , fin); ^