Compilare: user.cpp: In function ‘void df(int)’: user.cpp:15:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:27:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,x,y,in,sf,mij,maxi=0; muc aux; ^ user.cpp:28:28: 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:31:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&x,&y,&aux.c); ^