foo.cc: In function 'int main()':
foo.cc:10:11: warning: iteration 1001 invokes undefined behavior [-Waggressive-loop-optimizations]
   10 |    a[i][j]=-99999;
      |    ~~~~~~~^~~~~~~
foo.cc:8:16: note: within this loop
    8 |   for(int j=0;j<=1001;j++)
      |               ~^~~~~~

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