decode-string
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https://leetcode.com/problems/decode-string/ public class Solution { private String s; private int newPos; public String decodeString(String ins) { s = ‘.‘ + ins + ‘]‘; newPos = 0; String outStr = impl(1, 0); return outStr.substring(1, outStr.length()); } private String impl(int prefix, int startPos) { int base = 0; String baseStr = ""; String outStr = ""; for (int i=startPos; i<s.length(); i++) { char ch = s.charAt(i); if (ch == ‘[‘) { int tmpPos = i+1; baseStr += impl(base, tmpPos); i = newPos; base = 0; } else if (ch == ‘]‘) { for (int j=0; j<prefix; j++) { outStr += baseStr; } // At begin, use i+1, is wrong, // because in each loop there‘s i++ newPos = i; return outStr; } else if (!Character.isDigit(ch)){ baseStr += ch; } else { base = base * 10 + ch - ‘0‘; } } return outStr; } }
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