LeetCode 3463: Check If Digits Are Equal in String After Operations II Solution
Master LeetCode problem 3463 (Check If Digits Are Equal in String After Operations II), a hard 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.
3463. Check If Digits Are Equal in String After Operations II
Problem Explanation
Explanation
To solve this problem, we can simulate the given operations on the string until it has exactly two digits left. We iterate through the string, calculating the new digit based on each pair of consecutive digits. We continue this process until the string has only two digits left. Finally, we check if these two digits are equal and return true or false accordingly.
- Time Complexity: O(n) where n is the length of the input string s.
- Space Complexity: O(n) for storing the intermediate results.
Solution Code
class Solution {
public boolean checkIfDigitsAreEqual(String s) {
while (s.length() > 2) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length() - 1; i++) {
int sum = (s.charAt(i) - '0' + s.charAt(i + 1) - '0') % 10;
sb.append(sum);
}
s = sb.toString();
}
return s.charAt(0) == s.charAt(1);
}
}Try It Yourself
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