if string s[i] is '0' and s[i-1] is '9' , shall we ignore the '0' and jump '0'?
Then what about '10'? Why answer is 1 decode way?
If string ends with 90, it cannot be matched at all. Is that what you are asking?
For "10", it must be J -> 10 (one and only way), since you cannot match a single 0.
J -> 10
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