fn new() -> Self {
        let s = MinStack {
            v: vec![],
            minindex: 0,
        };
        s
    }
/** initialize your data structure here. */
initialize your data structure here.
initialize your data structure here .
fn new() -> Self {
        let s = MinStack {
            v: vec![],
            minindex: 0,
        };
        s
    }
fn new ( ) -> Self { let s = MinStack { v : vec ! [ ] , minindex : 0 , } ; s }
initialize your data structure here.
initialize your data structure here .