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69 lines (62 loc) · 1.36 KB
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Copy pathMinStack.java
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69 lines (62 loc) · 1.36 KB
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import java.util.*;
class MinStack {
Stack<Integer> s;
Stack<Integer> min;
public MinStack() {
s = new Stack<>();
min = new Stack<>();
}
public void push(int value) {
s.push(value);
if (min.isEmpty()) min.push(value);
else min.push(Math.min(min.peek(), value));
}
public void pop() {
s.pop();
min.pop();
}
public int top() {
return s.peek();
}
public int getMin() {
return min.peek();
}
}
// int n, min;
// List<Integer> s;
// public MinStack() {
// s=new ArrayList<>();
// n=0;
// min = Integer.MAX_VALUE;
// }
// public void push(int value) {
// s.add(n, value);
// n++;
// if(value<min) min=value;
// }
// public void pop() {
// if (n == 0) return;
// s.remove(n - 1);
// n--;
//
// if (n > 0) {
// min = s.get(0);
// for (int i = 1; i < n; i++) {
// min = Math.min(min, s.get(i));
// }
// }
// }
// public int top() {
// return s.get(n-1);
// }
// public int getMin() {
// return min;
// }
/**
* Your MinStack object will be instantiated and called as such:
* MinStack obj = new MinStack();
* obj.push(value);
* obj.pop();
* int param_3 = obj.top();
* int param_4 = obj.getMin();
*/