A famous example would be the Traveling Salesman problem: specified a list of metropolitan areas, along with the times to obtain from any metropolis to any other, in addition to a time limit, a potential solution would be described as a list of towns inside the order the salesman https://financefeeds.com/melania-meme-coin-67-crash-sends-investors-to-meme-index-as-hedge-against-volatility/