18 lines
370 B
Java
18 lines
370 B
Java
class Solution {
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public int minLength(String s) {
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var st = new Stack<Character>();
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for (var c : s.toCharArray()) {
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var last = !st.empty() ? st.peek() : '\0';
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if (last == 'A' && c == 'B') {
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st.pop();
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} else if (last == 'C' && c == 'D') {
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st.pop();
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} else {
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st.push(c);
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}
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}
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return st.size();
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}
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}
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