Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L[nod].size();i++){ ^ user.cpp: In function ‘void dfss(int)’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S[nod].size();i++){ ^ user.cpp: In function ‘int sol(int)’: user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:55:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:57:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^