Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:33:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:43:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, ns, a, b; ^ user.cpp: In function ‘void read(int&)’: user.cpp:20:96: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(buff[pos])) if(++pos == buff_size) fread(buff, 1,buff_size, stdin), pos = 0; ^ user.cpp:25:73: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == buff_size) fread(buff, 1, buff_size, stdin), pos = 0; ^