foo.cc: In function 'int main()':
foo.cc:12:24: error: 'n' was not declared in this scope
   12 |         for(int i=1;i<=n-1;i++){
      |                        ^
foo.cc:15:49: error: expected ')' before ';' token
   15 |                                 swap(a[j],a[j+1];
      |                                     ~           ^
      |                                                 )

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