-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathMinStack.java
More file actions
40 lines (35 loc) · 886 Bytes
/
MinStack.java
File metadata and controls
40 lines (35 loc) · 886 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
public class MinStack {
Stack<Integer> stk;
Stack<Integer> stkMin;
/** initialize your data structure here. */
public MinStack() {
this.stk = new Stack<Integer>();
this.stkMin = new Stack<Integer>();
}
public void push(int x) {
this.stk.push(x);
if (this.stkMin.empty()||x<=this.getMin()) {
this.stkMin.push(x);
}
}
public void pop() {
int ele = this.stk.pop();
if (ele==this.stkMin.peek()) {
this.stkMin.pop();
}
}
public int top() {
return this.stk.peek();
}
public int getMin() {
return this.stkMin.peek();
}
}
/**
* 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();
*/