/in/foo.cc: In function 'int main()':
/in/foo.cc:43:12: warning: iteration 120 invokes undefined behavior [-Waggressive-loop-optimizations]
    lei1[i] = 0; lei2[i] = 0; lei3[i] = 0;
    ~~~~~~~~^~~
/in/foo.cc:41:21: note: within this loop
   for (int i = 0; i < 1200; i++)
                   ~~^~~~~~