Compilare: user.c: In function ‘main’: user.c:72:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:80:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &a, &b, &c); ^ user.c: In function ‘prim’: user.c:55:13: warning: ‘nod2’ may be used uninitialized in this function [-Wmaybe-uninitialized] U[lenU++] = nod2; ^ user.c:60:18: warning: ‘nod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol[lenSol]->a = nod1; ^