code: private void setHandsComp(int[] otherTiles, List<Mentsu> mentsuList) {
          System.arraycopy(otherTiles, 0, handsComp, 0, otherTiles.length);
          for (Mentsu mentsu : mentsuList) {
              int code = mentsu.getTile().getCode();
  
              if (mentsu.isOpen()) {
                  isOpen = true;
              }
  
              if (mentsu instanceof Shuntsu) {
                  handsComp[code - 1] += 1;
                  handsComp[code] += 1;
                  handsComp[code + 1] += 1;
              } else if (mentsu instanceof Kotsu) {
                  handsComp[code] += 3;
              } else if (mentsu instanceof Kantsu) {
                  handsComp[code] += 4;
              } else if (mentsu instanceof Toitsu) {
                  handsComp[code] += 2;
              }
          }
      }
docs: コンストラクタで面子を入力した場合に
  面子を各牌の数に変換します
  
  @param otherTiles 各牌の数
  @param mentsuList 面子のリスト