Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < w[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&sigma); ^ main.cpp:30:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&x); ^