#coding practice

"I cried in a room for 25 years and I didn’t get a single hug from either of you."

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Problem Description: 

Given a string s, find and return the first instance of a non-repeating character in it. If there is no such character, return '_'.

Example:

For s = "abacabad", the output should be firstNotRepeatingCharacter(s) = 'c'. There are 2 non-repeating characters in the string: 'c' and 'd'. Return c since it appears in the string first.

Try solving the problem first before looking at my problem analysis & solution!

Coding practice is essential for anyone looking to improve their programming skills. Regular practice helps developers strengthen problem-solving abilities, understand programming concepts more deeply, and gain confidence in writing code.

Platforms like Codewars make coding practice engaging by offering challenges for a wide range of skill levels. These exercises encourage learners to apply their knowledge, explore new techniques, and develop more efficient solutions. Whether you are a beginner or an experienced programmer, consistent practice can help you continue growing as a developer.

This a sample program to demonstrate the use of various declarations that are used. There are indeed many more that are used based on given situation, but these are references on how few of them are used. #include <stdio.h> #include <stdlib.h> int my_add(int a, int b) { return a + b; } int my_sub(int a, int b) { return a - b; } int my_mul(int a, int b) { return a * b; } int my_div(int a, int b)…

You are given an n x n 2D matrix representing an image.

Rotate the image by 90 degrees (clockwise).

Note: You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.

Example 1:

Given input matrix = [  [1,2,3],  [4,5,6],  [7,8,9] ], rotate the input matrix in-place such that it becomes: [  [7,4,1],  [8,5,2],  [9,6,3] ]

Example 2:

Given input matrix = [  [ 5, 1, 9,11],  [ 2, 4, 8,10],  [13, 3, 6, 7],  [15,14,12,16] ], rotate the input matrix in-place such that it becomes: [  [15,13, 2, 5],  [14, 3, 4, 1],  [12, 6, 8, 9],  [16, 7,10,11] ]

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Alright, y’all -- let me be real with you. I have been staring at this question for about an hour and a half, and I’ve got nothing. I took a look at a couple of solutions to understand the best approach to rotating the image in place, but they go over my head. Maybe my brain is just fried.