Compilare: user.cpp: In function ‘int main()’: user.cpp:42:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[x].size();i++) ^ user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,x,y,z; muc aux; ^ user.cpp:25:28: 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:28:42: 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); ^