foo.cc: In function 'int main()':
foo.cc:6:18: error: invalid operands of types 'int [3]' and 'int [3]' to binary 'operator+'
  printf("%d",p[0]+p[1]+p[2]);
              ~~~~^~~~~
foo.cc:4:29: warning: unused variable 'n' [-Wunused-variable]
   int a[2][3]={1,2,3,4,5,6},n,(*p)[3];
                             ^

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