Compilare: user.c: In function ‘main’: user.c:21:5: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration] qsort(x,n,sizeof(int),compare); ^ user.c:13:57: warning: unused variable ‘ans’ [-Wunused-variable] int n,l,w,i,j,sus,jos=0,st=0,dr=0,r,p,s=0,pozx,pozy,ans=0; ^ user.c:13:17: warning: unused variable ‘j’ [-Wunused-variable] int n,l,w,i,j,sus,jos=0,st=0,dr=0,r,p,s=0,pozx,pozy,ans=0; ^ user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d",&n,&l,&w); ^ user.c:19:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&x[i],&y[i]); ^