Compilare: user.cpp: In function ‘int main()’: user.cpp:40:17: warning: unused variable ‘h’ [-Wunused-variable] int i,j,x,y,h,val; ^ user.cpp:41:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:43:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&q1[i],&q2[i]); ^