Compilare: main.cpp: In function 'void dfs(int)': main.cpp:9:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[nod].size(); i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:19:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ main.cpp:21:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^