foo.cc: In function 'int main()':
foo.cc:24:35: warning: iteration 3 invokes undefined behavior [-Waggressive-loop-optimizations]
   24 |                         if (a[i][j]>max)
      |                             ~~~~~~^
foo.cc:20:19: note: within this loop
   20 |         for (i=0;i<5;i++)
      |                  ~^~

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