SPOJ

A class went to a school trip. And, as usually, all N kids have got their backpacks stuffed with candy. But soon quarrels started all over »

Byteman has a collection of N squares with side 1. How many different rectangles can he form using these squares? Two rectangles are considered different if »

Nestor was doing the work of his math class about three days but he is tired of make operations a lot and he should deliver his »

Julka surprised her teacher at preschool by solving the following riddle: Klaudia and Natalia have 10 apples together, but Klaudia has two apples more than Natalia »

A fashion show rates participants according to their level of hotness. Two different fashion shows were organized, one for men and the other for women. A »

Jennifer is a teacher in the first year of a primary school. She has gone for a trip with her class today. She has taken a »

According to Wikipedia, an arithmetic progression (AP) is a sequence of numbers such that the difference of any two successive members of the sequence is a »

Mo and Larry have devised a way of encrypting messages. They first decide secretly on the number of columns and write the message (letters only) down »

Richard Phillips Feynman was a well known American physicist and a recipient of the Nobel Prize in Physics. He worked in theoretical physics and also pioneered »

Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,... as shown in the figure. For example, 1, 2 »