LeetCode 1781: Sum of Beauty of All Substrings Solution
Master LeetCode problem 1781 (Sum of Beauty of All Substrings), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1781. Sum of Beauty of All Substrings
Problem Explanation
Explanation
To solve this problem, we can iterate through all possible substrings of the given string and calculate the beauty of each substring. We can maintain a frequency array for each substring to keep track of the frequency of each character. Then, we can calculate the beauty as the difference between the maximum and minimum frequency in the frequency array. Finally, we sum up the beauty of all substrings to get the total sum of beauty of all substrings.
Time complexity: O(n^3) where n is the length of the input string s
Space complexity: O(26) = O(1)
Solution Code
class Solution {
public int beautySum(String s) {
int n = s.length();
int sum = 0;
for (int i = 0; i < n; i++) {
int[] freq = new int[26];
for (int j = i; j < n; j++) {
freq[s.charAt(j) - 'a']++;
int maxFreq = 0, minFreq = Integer.MAX_VALUE;
for (int k = 0; k < 26; k++) {
if (freq[k] > 0) {
maxFreq = Math.max(maxFreq, freq[k]);
minFreq = Math.min(minFreq, freq[k]);
}
}
sum += maxFreq - minFreq;
}
}
return sum;
}
}Try It Yourself
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