Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec[x].size();i++){ ~^~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec2[x].size();i++){ ~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:61:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<afis[i].size();j++){ ~^~~~~~~~~~~~~~~ user.cpp:43:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:45:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x1,&x2); ^