You are given two binary strings s1 and s2, both of length n.
In a single operation, you can apply one of the following modifications to s1:
Choose an index i where s1[i] is equal to $'0'$, and change s1[i] to $'1'$.
Choose two adjacent indices i and i + 1 where both s1[i] and s1[i + 1] are equal to $'1'$, and change both characters to $'0'$.
Return the minimum number of operations needed to transform s1 into s2. If it is impossible to transform s1 into s2, return
Constraints:
s1 and s2 consist only of $'0'$ and $'1'$.
You are given two binary strings s1 and s2, both of length n.
In a single operation, you can apply one of the following modifications to s1:
Choose an index i where s1[i] is equal to $'0'$, and change s1[i] to $'1'$.
Choose two adjacent indices i and i + 1 where both s1[i] and s1[i + 1] are equal to $'1'$, and change both characters to $'0'$.
Return the minimum number of operations needed to transform s1 into s2. If it is impossible to transform s1 into s2, return
Constraints:
s1 and s2 consist only of $'0'$ and $'1'$.