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MinStack.java
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MinStack.java
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package stack;
import java.util.Stack;
public class MinStack {
private int minElem ;
private Stack<Integer> st;
/** initialize your data structure here. */
public MinStack() {
minElem = Integer.MAX_VALUE;
st= new Stack();
}
public void push(int x) {
if(x <= minElem){
st.push(minElem);
minElem = x;
}
st.push(x);
}
public void pop() {
if(st.pop()==minElem){
minElem=st.pop();
}
}
public int top() {
return st.peek();
}
public int getMin() {
return minElem;
}
}
/**
* Your MinStack object will be instantiated and called as such:
* MinStack obj = new MinStack();
* obj.push(x);
* obj.pop();
* int param_3 = obj.top();
* int param_4 = obj.getMin();
*/