foo.c: In function 'main':
foo.c:9:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long long int *' [-Wformat=]
  scanf("%d%d%d%d", &a, &b, &c, &d);
         ~^         ~~
         %lld
foo.c:9:12: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'long long int *' [-Wformat=]
  scanf("%d%d%d%d", &a, &b, &c, &d);
           ~^           ~~
           %lld
foo.c:9:14: warning: format '%d' expects argument of type 'int *', but argument 4 has type 'long long int *' [-Wformat=]
  scanf("%d%d%d%d", &a, &b, &c, &d);
             ~^             ~~
             %lld
foo.c:9:16: warning: format '%d' expects argument of type 'int *', but argument 5 has type 'long long int *' [-Wformat=]
  scanf("%d%d%d%d", &a, &b, &c, &d);
               ~^               ~~
               %lld
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &a, &b, &c, &d);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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