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Copy pathMinStack.java
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61 lines (51 loc) · 1.13 KB
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package stack;
import java.util.Stack;
public class MinStack {
private Stack<Integer> values;
// the min stack value from top to bottom
private Stack<Integer> minValues;
/** initialize your data structure here. */
public MinStack() {
values = new Stack<>();
minValues = new Stack<>();
}
public void push(int x) {
values.push( x );
if ( minValues.isEmpty() )
{
minValues.push( x );
}
else
{
if ( minValues.peek() < x )
{
minValues.push( minValues.peek() );
}
else
{
minValues.push( x );
}
}
}
public void pop()
{
minValues.pop();
values.pop();
}
public int top()
{
return values.peek();
}
public int getMin()
{
return minValues.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();
*/