Compilare: user.cpp: In function ‘int main()’: user.cpp:33:13: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int n,i,j,max; ^ user.cpp:36:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:39:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&v[i].st,&v[i].dr); ^