#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!

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.

I've gone mad with power. Thanks to investigating every single comment and answer to this Stack Overflow post and combining key features of a couple answers, I have assembled a single Ruby method that handles nonblocking, carriage-return-free i/o beautifully for realtime little scripted games. BEHOLD:

require 'io/wait'

def char_if_pressed   begin     state = `stty -g` #turn raw input on     system `stty raw -echo -icanon isig`     c = nil if $stdin.ready?     c = $stdin.getc   end     c.chr if c   ensure     system `stty #{state}` # turn raw input off and                              #restore state   end end