Compilare: user.cpp: In function ‘int main()’: user.cpp:31:11: warning: unused variable ‘a’ [-Wunused-variable] int n,a,b,i,j,max; ^ user.cpp:31:13: warning: unused variable ‘b’ [-Wunused-variable] int n,a,b,i,j,max; ^ user.cpp:34:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:37:43: 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); ^