Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i < g[from].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:27:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ user.cpp:30:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &from, &to); ^