Compilare: user.c: In function ‘back’: user.c:9:17: warning: unused variable ‘cop’ [-Wunused-variable] int cop=next[i],pp=0,cop1=sCur; ^ user.c:5:9: warning: unused variable ‘i’ [-Wunused-variable] int i=0; ^ user.c:39:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:46:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&g); ^ user.c:49:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i]); ^