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  1. #include <iostream>
  2. #include <string>
  3. #include <set>
  4. #include <algorithm>
  5.  
  6. using namespace std;
  7.  
  8. int longestValidSubstring(const string& s, int k) {
  9.     int n = s.length();
  10.     multiset<char> st;
  11.     int i = 0;
  12.     int j = 0;
  13.     int maxLength = 0;
  14.  
  15.     while (j < n) {
  16.         // Expand the window by adding the current character
  17.         st.insert(s[j]);
  18.  
  19.         // Shrink the window from the left if the max difference exceeds k
  20.         while (*st.rbegin() - *st.begin() > k) {
  21.             st.erase(st.find(s[i]));
  22.             ++i;
  23.         }
  24.  
  25.         // Update the maximum length found so far
  26.         maxLength = max(maxLength, j - i + 1);
  27.         j++;
  28.     }
  29.  
  30.     return maxLength;
  31. }
  32.  
  33. int main() {
  34.     // Example 1
  35.     string s1 = "abdfa";
  36.     int k1 = 2;
  37.     cout << "String: " << s1 << ", k = " << k1 << "\n";
  38.     cout << "Longest Valid Substring Length: " << longestValidSubstring(s1, k1) << "\n\n";
  39.     // Explanation: "ab" (diff 1), "bd" (diff 2), "df" (diff 2) are valid. Max length is 2.
  40.  
  41.     // Example 2
  42.     string s2 = "edcba";
  43.     int k2 = 2;
  44.     cout << "String: " << s2 << ", k = " << k2 << "\n";
  45.     cout << "Longest Valid Substring Length: " << longestValidSubstring(s2, k2) << "\n";
  46.     // Explanation: "edc" (diff 'e'-'c' = 2), "dcb" (diff 2), "cba" (diff 2). Max length is 3.
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 5316KB
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Standard input is empty
stdout
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String: abdfa, k = 2
Longest Valid Substring Length: 2

String: edcba, k = 2
Longest Valid Substring Length: 3
https://ideone.com/b8Ly5Y
dp google oa
language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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