Compilare: user.c: In function ‘main’: user.c:56:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^ user.c:56:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k; ^ user.c:52:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&N,&M,&C); ^ user.c:67:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&v1,&v2); ^ user.c: In function ‘cauta’: user.c:24:13: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nod; ^