张蔡辉

Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorful strings of beads. However the owner of the shop would only sel...

The basic task is simple: givenNreal numbers, you are supposed to calculate their average. But what makes it complicated is that some of the input numbers might not be legal. Alegalinput is a real ...

On a broken keyboard, some of the keys are always stucked. So when you type some sentences, the characters corresponding to those keys will appear repeatedly on screen forktimes.Now given a resulti...