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MinStack.java
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MinStack.java
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import java.util.Stack;
public class MinStack {
static Stack<StackPair> stack = new Stack<>();
public static class StackPair{
int value;
int currentMin;
StackPair(int value, int currentMin){
this.value = value;
this.currentMin = currentMin;
}
}
public int getMinStack(){
return stack.peek().currentMin;
}
public void push(int value){
if(stack.isEmpty()){
stack.push(new StackPair(value,value));
}else {
int currentMinInStack = stack.peek().currentMin;
stack.push(new StackPair(value,Math.min(value,currentMinInStack)));
}
}
public int peek(){
return stack.peek().value;
}
public void pop(){
if (!stack.isEmpty()){
stack.pop();
}
}
public static void main(String[] args) {
MinStack minStack = new MinStack();
minStack.push(2);
minStack.push(3);
minStack.push(-10);
minStack.push(6);
minStack.pop();
System.out.println(minStack.getMinStack());
System.out.println(minStack.peek());
minStack.pop();
System.out.println(minStack.getMinStack());
System.out.println(minStack.peek());
}
}