Compilare: user.c: In function ‘buildtree’: user.c:141:16: warning: unused variable ‘p’ [-Wunused-variable] long i, j, k, p; ^ user.c: In function ‘compute’: user.c:270:16: warning: unused variable ‘p’ [-Wunused-variable] long i, j, k, p, pmax, pmax2, max1, max2; ^ user.c: In function ‘readdata’: user.c:39:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(filein, "r", stdin); ^ user.c:40:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld", &dx, &dy, &n); ^ user.c:43:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld", &xsx[i], &ysx[i]); ^ user.c: In function ‘outputdata’: user.c:358:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(fileout, "w", stdout); ^ user.c: In function ‘locate’: user.c:193:2: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] return poz; ^ user.c: In function ‘compute’: user.c:322:5: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] k = addtotree(poz[k], k, narb, +1); ^ user.c:317:17: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] addtotree(poz[k], k, narb, -1); ^ user.c:295:5: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] k = addtotree(poz[k], k, narb, +1); ^ user.c:290:17: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] addtotree(poz[k], k, narb, -1); ^