foo.cc: In function 'int main()':
foo.cc:35:1: error: expected '}' at end of input
 }
 ^
foo.cc:19:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
                                ~~~~~^~~~~~~~~~~~~

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