foo.cc: In function ‘int main()’:
foo.cc:13:42: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations]
   13 |     for(int i = 1; i <= 100001; i++)b[i] = false;
      |                                     ~~~~~^~~~~~~
foo.cc:13:22: note: within this loop
   13 |     for(int i = 1; i <= 100001; i++)b[i] = false;
      |                    ~~^~~~~~~~~
foo.cc:13:42: warning: ‘void* __builtin_memset(void*, int, long unsigned int)’ forming offset 100001 is out of the bounds [0, 100001] of object ‘b’ with type ‘bool [100001]’ [-Warray-bounds=]
   13 |     for(int i = 1; i <= 100001; i++)b[i] = false;
      |                                     ~~~~~^~~~~~~
foo.cc:4:6: note: ‘b’ declared here
    4 | bool b[100001];
      |      ^

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