Compilare: main.c: In function 'main': main.c:32:15: warning: type defaults to 'int' in declaration of 'i' [-Wimplicit-int] for (auto i = n - 1; i > 1; i -= 2) { ^ main.c:36:15: warning: type defaults to 'int' in declaration of 'i' [-Wimplicit-int] for (auto i = size - 1; i >= 0; i -= 1) { ^ main.c:27:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^~~~~~~~~~~~~~~~~~~~~