[못풀었다/프로그래머스] 여행경로

function solution(tickets) {
  let answer = [];
  const result = [];
  const visited = [];
  
  tickets.sort();
  
  const len = tickets.length;
  const dfs = (departure,count) =>{
        result.push(departure)
        if(count===len){
            answer = result;
            return true;
        }
        for(let i=0;i<len;i++){
            if(!visited[i]&&tickets[i][0]===departure){
                visited[i]=true;
                if(dfs(tickets[i][1],count+1)) return true;
                visited[i]=false;
            }
        }
        result.pop();
        return false
    }
    
  dfs("ICN", 0);
  
  return answer;
}