Given a string s, you need to partition it into one or more balanced substrings. For example, if s == "ababcc" then ("abab", "c", "c"), ("ab", "abc", "c"), and ("ababcc") are all valid partitions, but ("a", "bab", "cc"), ("aba", "bc", "c"), and ("ab", "abcc") are not. The unbalanced substrings are bolded.
Return the minimum number of substrings that you can partition s into.
Note: A balanced string is a string where each character in the string occurs the same number of times.
\n\n\n
Example 1:
\n\nInput: s = "fabccddg"
\n\nOutput: 3
\n\nExplanation:
\n\nWe can partition the string s into 3 substrings in one of the following ways: ("fab, "ccdd", "g"), or ("fabc", "cd", "dg").
Example 2:
\n\nInput: s = "abababaccddb"
\n\nOutput: 2
\n\nExplanation:
\n\nWe can partition the string s into 2 substrings like so: ("abab", "abaccddb").
\n
Constraints:
\n\n1 <= s.length <= 1000s consists only of English lowercase letters.给你一个字符串 s ，你需要将它分割成一个或者更多的 平衡 子字符串。比方说，s == \"ababcc\" 那么 (\"abab\", \"c\", \"c\") ，(\"ab\", \"abc\", \"c\") 和 (\"ababcc\") 都是合法分割，但是 (\"a\", \"bab\", \"cc\") ，(\"aba\", \"bc\", \"c\") 和 (\"ab\", \"abcc\") 不是，不平衡的子字符串用粗体表示。
请你返回 s 最少 能分割成多少个平衡子字符串。
注意：一个 平衡 字符串指的是字符串中所有字符出现的次数都相同。
\n\n\n\n
示例 1：
\n\n输入：s = \"fabccddg\"
\n\n输出：3
\n\n解释：
\n\n我们可以将 s 分割成 3 个子字符串：(\"fab, \"ccdd\", \"g\") 或者 (\"fabc\", \"cd\", \"dg\") 。
示例 2：
\n\n输入：s = \"abababaccddb\"
\n\n输出：2
\n\n解释：
\n\n我们可以将 s 分割成 2 个子字符串：(\"abab\", \"abaccddb\") 。
\n\n
提示：
\n\n1 <= s.length <= 1000s 只包含小写英文字母。dp[i] be the minimum number of partitions for the prefix ending at index i + 1.",
"dp[i] can be calculated as the min(dp[j]) over all j such that j < i and word[j+1…i] is valid."
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