1472. Design Browser History

class BrowserHistory {
vector<string> v;
int idx=-1;
int mxSize=0;
public:
    BrowserHistory(string homepage) {
        v.push_back(homepage);
        idx=0,mxSize=1; }
    
    void visit(string url) {
       if(v.size()-1>idx){
           v[idx+1]=url;
           idx++;
           mxSize=idx+1;
       }
       else{
           v.push_back(url);
           idx++;
           mxSize++;
       }
    }
    
    string back(int steps) {
        int ans=min(steps,idx);
        idx-=ans;
        return v[idx];
    }
    
    string forward(int steps) {
       int ans=min(steps,mxSize-idx-1);
       idx+=ans;
       return v[idx];
    }
};

/**
 * Your BrowserHistory object will be instantiated and called as such:
 * BrowserHistory* obj = new BrowserHistory(homepage);
 * obj->visit(url);
 * string param_2 = obj->back(steps);
 * string param_3 = obj->forward(steps);
 */