Compilare: user.c: In function ‘main’: user.c:6:22: warning: unused variable ‘j’ [-Wunused-variable] long t,x,c,i,n,k,j; ^ user.c:6:14: warning: unused variable ‘c’ [-Wunused-variable] long t,x,c,i,n,k,j; ^ user.c:6:12: warning: unused variable ‘x’ [-Wunused-variable] long t,x,c,i,n,k,j; ^ user.c:9:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&t); ^ user.c:10:29: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<t;i++) {fscanf(f,"%ld",&n);fscanf(f,"%ld",&k); ^ user.c:10:48: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<t;i++) {fscanf(f,"%ld",&n);fscanf(f,"%ld",&k); ^