Compilare: user.cpp: In function ‘int main()’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<l[c[p]].size();i++){ ^ user.cpp:13:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&n,&m,&x); ^ user.cpp:15:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^