/in/foo.cc: In function 'int main()':
/in/foo.cc:9:21: warning: iteration 47 invokes undefined behavior [-Waggressive-loop-optimizations]
    9 |                 a[i]=a[i-1]+a[i-2];
      |                 ~~~~^~~~~~~~~~~~~~
/in/foo.cc:7:22: note: within this loop
    7 |         for(int i=3;i<=50;i++)
      |                     ~^~~~