A string s is called good if there are no two different characters in s that have the same frequency.
Given a string s, return the minimum number of characters you need to delete to make s good.
The frequency of a character in a string is the number of times it appears in the string. For example, in the string "aab", the frequency of 'a' is 2, while the frequency of 'b' is 1.
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Example 1:
\n\n\nInput: s = "aab"\nOutput: 0\nExplanation: s is already good.\n\n\nExample 2:
\n\n\nInput: s = "aaabbbcc"\nOutput: 2\nExplanation: You can delete two 'b's resulting in the good string "aaabcc".\nAnother way it to delete one 'b' and one 'c' resulting in the good string "aaabbc".\n\n
Example 3:
\n\n\nInput: s = "ceabaacb"\nOutput: 2\nExplanation: You can delete both 'c's resulting in the good string "eabaab".\nNote that we only care about characters that are still in the string at the end (i.e. frequency of 0 is ignored).\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 105s contains only lowercase English letters.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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