Backtracking

I received a picture puzzle in WhatsApp. I will explain here how I solved that using programming. I used Backtracking concept. Received picture puzzle below puzzle is simple algebra concept. If you have paper and pencile then it can be solved easily. But I just wanted to use some programming concept. Algebra notation of the puzzle just fill the empty circle with some letters (a,b,c,d,e) Left to right a - b = 5 c + 1 = d 12 - e = 10 Top to bottom...

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony: I’m sure I’ll write a lot more interesting things in the future. There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it....