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Create MinStack.java #2666

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Create MinStack.java #2666

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32 changes: 32 additions & 0 deletions MinStack.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
class MinStack {
Stack<Integer> st;
Stack<Integer> minSt;
int min;

public MinStack() {
this.st = new Stack<>();
this.minSt = new Stack<>();
this.min = Integer.MAX_VALUE;
minSt.push(min);
}

public void push(int val) {
min = Math.min(val,min);
st.push(val);
minSt.push(min);
}

public void pop() {
st.pop();
minSt.pop();
min = minSt.peek();
}

public int top() {
return st.peek();
}

public int getMin() {
return min;
}
}