You are given a positive integer num consisting only of digits 6 and 9.
Return the maximum number you can get by changing at most one digit (6 becomes 9, and 9 becomes 6).
\n
Example 1:
\n\n\nInput: num = 9669\nOutput: 9969\nExplanation: \nChanging the first digit results in 6669.\nChanging the second digit results in 9969.\nChanging the third digit results in 9699.\nChanging the fourth digit results in 9666.\nThe maximum number is 9969.\n\n\n
Example 2:
\n\n\nInput: num = 9996\nOutput: 9999\nExplanation: Changing the last digit 6 to 9 results in the maximum number.\n\n\n
Example 3:
\n\n\nInput: num = 9999\nOutput: 9999\nExplanation: It is better not to apply any change.\n\n\n
\n
Constraints:
\n\n1 <= num <= 104num consists of only 6 and 9 digits.Compiled with clang 11 using the latest C++ 17 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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\\r\\n\\r\\nFor Map/TreeMap data structure, you may use sortedcontainers library.
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\\r\\n\\r\\nFor hash table operations, you may use uthash. \\\"uthash.h\\\" is included by default. Below are some examples:
\\r\\n\\r\\n1. Adding an item to a hash.\\r\\n
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\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n\\r\\n\\r\\n\\r\\n3. Deleting an item in a hash:\\r\\n
\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n\\r\\n\"], \"csharp\": [\"C#\", \"\\r\\n\\r\\nYour code is compiled with debug flag enabled (/debug).
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Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms
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