foo.cc: In function 'int main()':
foo.cc:24:17: error: 'isPrine' was not declared in this scope; did you mean 'isPrime'?
   24 |   if (N%i==0 && isPrine(i)==1)
      |                 ^~~~~~~
      |                 isPrime
foo.cc:26:10: warning: statement has no effect [-Wunused-value]
   26 |    a[num]==i;
      |    ~~~~~~^~~

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