Compilare: user.c: In function ‘main’: user.c:34:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.c:36:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^ user.c:14:13: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] stiva[0]=nod; ^ user.c:31:27: note: ‘start’ was declared here int n, m, i, a, b, f, start; ^