Created
February 5, 2025 18:11
Remove k digits - shortened
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public static String removeKdigits(String num, int k) { | |
Deque<Character> resultDeque = new ArrayDeque<>(); | |
resultDeque.add(num.charAt(0)); | |
for (int i = 1; i < num.length(); ++i) { | |
var nextChar = num.charAt(i); | |
while (k > 0 && !resultDeque.isEmpty() && resultDeque.peekLast() > nextChar) { //Возвращаемся на символ назад | |
resultDeque.removeLast(); | |
k--; | |
} | |
resultDeque.add(nextChar); | |
} | |
while (k > 0) { | |
resultDeque.removeLast(); | |
k--; | |
} | |
StringBuilder builder = new StringBuilder(); | |
while (!resultDeque.isEmpty()) { | |
char ch = resultDeque.removeFirst(); | |
if (builder.length() == 0 && ch == '0') { | |
continue; | |
} | |
builder.append(ch); | |
} | |
return builder.length() == 0 ? "0" : builder.toString(); | |
} |
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