foo.cc: In function 'int main()':
foo.cc:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 2; i <= n / 2 + 1; i++) {
                  ~~^~~~~~~~~~~~
foo.cc:63:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (i == p) {
       ~~^~~~

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Found 30 testcases.
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