How to Solve Using a Robot to Print the Lexicographically Smallest String Problem
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Using a Robot to Print the Lexicographically Smallest String
You are given a string s and a robot that currently holds an empty string t. Apply one of the following operations until s and t are both empty: Remove the first character of a string s and give it to...
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Understanding the Using a Robot to Print the Lexicographically Smallest String Problem
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Problem Statement
You are given a string s and a robot that currently holds an empty string t. Apply one of the following operations until s and t are both empty: Remove the first character of a string s and give it to the robot. The robot will append this character to the string t. Remove the last character of a string t and give it to the robot. The robot will write this character on paper. Return the lexicographically smallest string that can be written on the paper.
Using a Robot to Print the Lexicographically Smallest String
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Examples
s = "zza"
"azz"
Let p denote the written string. Initially p="", s="zza", t="". Perform first operation three times p="", s="", t="zza". Perform second operation three times p="azz", s="", t="".
s = "bac"
"abc"
Let p denote the written string. Perform first operation twice p="", s="c", t="ba". Perform second operation twice p="ab", s="c", t="". Perform first operation p="ab", s="", t="c". Perform second operation p="abc", s="", t="".
s = "bdda"
"addb"
Let p denote the written string. Initially p="", s="bdda", t="". Perform first operation four times p="", s="", t="bdda". Perform second operation four times p="addb", s="", t="".
Constraints
1 <= s.length <= 105
s consists of only English lowercase letters.
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