Today i accidentally discover this oj, it is much cooler then the oj i used before, which is POJ:http://www.poj.org, i just encountered a new word called visual judge and found this, this is my first day, well i am just a sophomore in china who have a little programming skill and most comes from coursera, /*thanks to the website that changed my world*/ and a big dream i’ll go for the next weekly contest, wish me good luck.