Compilare: user.cpp: In function ‘int main()’: user.cpp:52:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<sol.size();i++) ^ user.cpp:47:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d",&n,&m); ^ user.cpp:48:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(;m--;){int x,y;fscanf(f1,"%d%d",&x,&y);g[x].push_back(y);g[y].push_back(x);} ^