foo.cc: In function 'int main()':
foo.cc:12:25: warning: array subscript 19 is above array bounds of 'int [16]' [-Warray-bounds]
   12 |         z=a[3]+a[6]+a[19]+a[12];
      |                     ~~~~^
foo.cc:4:13: note: while referencing 'a'
    4 |         int a[16];
      |             ^

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