LeetCode 394. Decode String
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public class Solution { public String decodeString(String s) { int start = 0; int end = 0; int repeat = 0; int brackets = 0; StringBuilder sb = new StringBuilder(); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c >= '0' && c <= '9' && brackets == 0) repeat = repeat * 10 + c - '0'; else if (c >= 'a' && c <= 'z' && repeat == 0)sb.append(c); else if (c == '[') { if (brackets == 0) start = i + 1; brackets++; } else if (c == ']') { brackets--; if (brackets == 0) { end = i; String sub = decodeString(s.substring(start, end)); for (int j = 0; j < repeat; j++) sb.append(sub); start = 0; end = 0; repeat = 0; brackets = 0; } } } return sb.toString(); }} 0 0
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