foo.cc: In function 'bool IsPrime(ll)':
foo.cc:31:10: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   31 |     if(x & 1 ^ 1) return false;
      |        ~~^~~
foo.cc: In function 'int main()':
foo.cc:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   65 |     scanf("%d", &t);
      |     ~~~~~^~~~~~~~~~
foo.cc:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |         scanf("%d",&n);
      |         ~~~~~^~~~~~~~~

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