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Copy pathP_155.java
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39 lines (30 loc) · 847 Bytes
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package leetcode.easy;
import java.util.ArrayDeque;
import java.util.Deque;
@SuppressWarnings({ "InnerClassMayBeStatic", "PublicConstructorInNonPublicClass", "unused" })
public class P_155 {
class MinStack {
Deque<Integer> dq, min;
public MinStack() {
dq = new ArrayDeque<>();
min = new ArrayDeque<>();
}
public void push(int val) {
if (min.isEmpty() || min.peekFirst() >= val) {
min.addFirst(val);
}
dq.addFirst(val);
}
public void pop() {
if (min.element().equals(dq.removeFirst())) {
min.removeFirst();
}
}
public int top() {
return dq.element();
}
public int getMin() {
return min.element();
}
}
}