Compilare: user.cpp: In function ‘int main()’: user.cpp:82:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vecini[i].size();++j) ~^~~~~~~~~~~~~~~~~ user.cpp:49:24: warning: unused variable ‘cont’ [-Wunused-variable] int n,m,i,j,k1=0,o,cont,k2=0; ^~~~ user.cpp:52:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:55:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&i,&j); ^