I am trying to solve the problem http://codeforces.com/problemset/problem/507/C .I understood the problem clearly and i saw this soltuion 9539221 .But i am not able to undertand the code clearly.What is the if statement in the code mean? pls help..thanks

hii everyone..i am new here...wer can i ask doubts regarding any problems??i am not seeing any active dicussion about problems.