# 영어끝말잇기

> <https://programmers.co.kr/learn/courses/30/lessons/12981>

* 문제요약
  * 단어 재사용 안됨
  * 탈락발생 (나왔던 단어 / 규칙위반)
  * 탈락 발생이 몇바퀴째인지 반환
  * 탈락 발생 인덱스 반환

```python
def solution(n, words):

    a = [words[0][0]]

    # words 안에서 하나씩 a 에 추가
    for i, w in enumerate(words):
          # 새로 추가할 것이 이미 나왔던 것이나 규칙위반이면
        if (w in a) or a[-1][-1] != w[0]:
              # 현재 i 를 보고 [추가하던 인덱스, a의 row(몇번째)] 반환
            return [(i % n) + 1, (i // n) + 1]
                # 규칙위반 아니면 추가
        a.append(w)
        # 다 했으면 [0, 0] 반환
    return [0, 0]


n = 3
words = ["tank", "kick", 'know', 'wheel', 'land', 'dream', 'mother', 'robot', 'tank']

print(solution(n, words))
```


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