후위 표기식
Before
for (int i = 0; i < N; i++) {
Stack<Character> stack = new Stack<>();
String input = br.readLine();
for (char ch : input.toCharArray()) {
if (stack.isEmpty()) {
stack.push(ch);
continue;
}
if (stack.peek() == ch) {
stack.pop();
}
}
Java
복사
After
for (int i = 0; i < N; i++) {
Stack<Character> stack = new Stack<>();
String input = br.readLine();
for (char ch : input.toCharArray()) {
if (!stack.isEmpty() && stack.peek() == ch) {
stack.pop();
} else {
stack.push(ch);
}
}
Java
복사
