Leetcode #1472: Design Browser History

Leetcode_1472.cpp

class BrowserHistory {
    stack<string> history;
    stack<string> future;
    string currentWebsite; 
    
    void clearForwardStack() {
        future = stack<string>();
    }
    
    void goBackOneStep() {
        if (!history.empty()) {
            future.push(currentWebsite);
            currentWebsite = history.top();
            history.pop();
        }
    }
    
    void goForwardOneStep() {
        if (!future.empty()) {
            history.push(currentWebsite);
            currentWebsite = future.top();
            future.pop();
        }
    }
    
public:
    BrowserHistory(string homepage) {
        currentWebsite = homepage;
        clearForwardStack();
    }
    
    void visit(string url) {
        history.push(currentWebsite);
        currentWebsite = url;
        clearForwardStack();    
    }
    
    string back(int steps) {
        while(steps > 0) {
            goBackOneStep();
            steps--;
        }
        return currentWebsite;
    }
    
    string forward(int steps) {
        while(steps > 0) {
            goForwardOneStep();
            steps--;
        }
        return currentWebsite;
    }
};