Compilare: main.cpp: In function 'int main()': main.cpp:59:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i=0;i<G[n].size();i++ ){ ~^~~~~~~~~~~~ main.cpp:50:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%i %i",&n,&m); ^ main.cpp:52:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d",&x,&y,&z); ^