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First Unique Character in a String

Problem Find the first non-repeating character in a given String and return it's index. If it doesn't exist, return -1. Solution We can execute the logic in two steps Find the frequencies of every letter how many times they appear in the string Using those frequencies find the the first letter which has value as 1 We need to use a Map to keep track of the first index of a letter and separate storage to maintain the frequency count. Example code is as below:
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Number Complement

Number Complement For Positive Integer For a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation. Solution  To solve above problem we need to generate the binary representation of a number and go through the bits to find the complement of the bit.  To get the complement a simple logic can we do the XOR the bit with 1 which will give its complement  i.e.  1 ^ 1 = 0 0 ^ 1 = 1 Sample Code  
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Check If It Is a Straight Line

Problem Given a list of x, y coordinates, find if all the coordinates are on a straight line. if YES return 'True' otherwise return 'False' Solution   Equation for the straight line is  y = mx + c where y and x are the coordinates and m and c are integer constants. if all the inputs are on the same straight line they should follow the above formula. We can use first two points to find the value of m and c and check other following points using the formula. if first point is x1, y1 and second point is x2, y2 y1 = m * x1 + c y2 = m * x2 + c m = (y2-y1)/(x2-x1) c = y1-(m*x1) one we have above values for every point we can check if y3 = m*x3+c ...  If we put above logic in the java code it will look like this
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