작업 | 레벨 9 | 9과

Implement the lengthOfLongestUniqueSubstring method so that it returns the length of the longest substring without repeated characters in the string passed as an argument. For example, for "a123bcbcqwe", it should return 6. For "ttttwt", it should return 2.

While developing a complex encryption algorithm, there was a need to determine whether the binary representation of a number has an even number of ones. Implement the boolean isWeightEven(long number) method.

Continuing the development of the algorithm, we could really use a method that can swap specified bits in the binary representation of a long. Implement a long swapBits(long number, int i, int j) method that swaps the bits with indices i and j in the binary representation of number.

A boy runs up a flight of stairs consisting of n steps; in 1 bound, he can move up one, two or three steps. Implement the numberOfPossibleAscents(int n) method, which should return the number of ways the boy can ascend an entire flight of stairs consisting of n steps.

While developing a new version of a popular graphics editor, it has become necessary to implement the ability to fill an area of an image with a specified color.

Amigo, help... I have no idea what to do. I carefully followed the specifications, which required me to create a system for enabling an alarm. I created an alarm system (SecuritySystem) and power button (ElectricPowerSwitch), and verified that it works in the Solution class's main method.

The Worker interface contains too many methods that do too many different things. As a result, classes that want to support only part of the functionality have to implement methods that they don't actually need.

Implement the isPalindromePermutation(String s) method. It should return true if you can make a palindrome from all the characters in string s. Otherwise, it should return false. The passed string includes only ASCII characters. Ignore the case of the letters.

Implement the isOneEditAway(String first, String second) method that returns true if it is possible to edit/add/delete one character in one of the strings to get the other string. The passed string includes only ASCII characters. Ignore the case of the characters.

Fix the bug in the isPowerOfThree(int n) method. It should return true if n is an integer power of the number 3. Otherwise, it should return false.

You must implement the rollback method in the Software class. It should make it possible to roll back the current software version to the desired version. All versions after the one we roll back to must be removed. And don't forget to change the currentVersion field.

Implement the int maxSquare(int[][] matrix) method. IT returns the area of the largest square of ones in the two-dimensional array called matrix. The matrix array contains only zeros and ones.