给你一个下标从 0 开始长度为 n 的字符串 num ，它只包含数字。 如果对于 每个 0 <= i < n 的下标 i ，都满足数位 i 在 num 中出现了 num[i]次，那么请你返回 true ，否则返回 false 。 示例 1： 输入：num = "1210"输出：true解释：num[0] = '1' 。数字 0 在 num 中出现了一次。num[1] = '2' 。数

Kim likes to play Tic-Tac-Toe. Given a current state, and now Kim is going to take his next move. Please tell Kim if he can win the game in next 2 moves if both player are clever enough. Here “next

Kim likes to play Tic-Tac-Toe. Given a current state, and now Kim is going to take his next move. Please tell Kim if he can win the game in next 2 moves if both player are clever enough. Here “next