Would be great to keep track of questions solved / total number of questions. Thanks. Also, checkout: [Striver's list](https://docs.google.com/document/d/1SM92efk8oDl8nyVw8NHPnbGexTS9W-1gmTEYfEurLWQ/preview?pru=AAABdCnqg2E*ahqUNNC41Gk7UPJwB-AX6g) if you're adding more problems to the list.