Leetcode 2546. Apply Bitwise Operations to Make Strings Equal

Determine whether you can transform binary string s into target by repeatedly picking indices i,j and replacing (s[i],s[j]) with (s[i] OR s[j], s[i] XOR s[j]); key observation: any string with at least one '1' can be transformed into any other string with at least one '1', while an all-zero string stays all-zero, so the answer is true iff s == target or both strings contain at least one '1'.