/in/foo.cc: In function 'void shai()':
/in/foo.cc:9:50: warning: iteration 1000004 invokes undefined behavior [-Waggressive-loop-optimizations]
    9 |   for(int i=1;i<=1000005;i++) b[i]=b[i-1]+int(a[i]);
      |                                               ~~~^
/in/foo.cc:9:16: note: within this loop
    9 |   for(int i=1;i<=1000005;i++) b[i]=b[i-1]+int(a[i]);
      |               ~^~~~~~~~~