[프로그래머스] 스킬트리

https://programmers.co.kr/learn/courses/30/lessons/49993

프로그래머스

function solution(skill, skill_trees) {
  var answer = skill_trees.length;

  for (var i = 0; i < skill_trees.length; i++) {
    var stack = "";
    for (var j = 0; j < skill_trees[i].length; j++) {
      if (skill.indexOf(skill_trees[i][j]) != -1) {
        stack += skill_trees[i][j];
        if(stack.length==skill.length){
          break;
        }
      }
    }
    for (var j = 0; j < stack.length; j++) {
      if (stack[j] != skill[j]) {
        answer--;
        break;
      }
    }
  }

  return answer;
}