String Coding Problems

Learn string processing and pattern matching

803
Total Problems
228
Easy
390
Medium
177
Hard
Start Practicing
"Hello"

Master DSA Topics - January, 2026

Practice problems across 75+ categories

String Coding Problems

Practice problems frequently asked at String 803 problems | 228 Easy | 390 Medium | 177 Hard

# Problem Difficulty Topics
121 Count Substrings That Satisfy K-Constraint II Hard
ArrayStringBinary Search
122 Count Substrings With K-Frequency Characters I Medium
Hash TableStringSliding Window
123 Count Substrings With K-Frequency Characters II Hard
Hash TableStringSliding Window
124 Count Substrings with Only One Distinct Letter Easy
MathString
125 Count Substrings Without Repeating Character Medium
Hash TableStringSliding Window
126 Count the Number of Consistent Strings Easy
ArrayHash TableString
127 Count the Number of Good Subsequences Medium
Hash TableMathString
128 Count the Number of Powerful Integers Hard
MathStringDynamic Programming
129 Count the Number of Special Characters I Easy
Hash TableString
130 Count the Number of Special Characters II Medium
Hash TableString
131 Count the Number of Substrings With Dominant Ones Medium
StringEnumeration
132 Count the Number of Vowel Strings in Range Easy
ArrayStringCounting
133 Count The Number of Winning Sequences Hard
StringDynamic Programming
134 Count The Repetitions Hard
StringDynamic Programming
135 Count Unique Characters of All Substrings of a Given String Hard
Hash TableStringDynamic Programming
Showing 121-135 of 803
1 ... 7 8 9 10 11 ... 54

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public class MyFirstJavaProgram { Edit & Run

   /* This is my first java program.
    * This will print 'Hello, World!' as the output
    */

   public static void main(String []args) {
      System.out.println("Hello, World!"); // prints
   }
}

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