题面: Magic Triangle Problem Description: Huangriq is a respectful acmer in ACM team of XTU because he brought the best place in regional contest in history of XTU. Huangriq works in a big compa
题面: Coins Problem Description: Duoxida buys a bottle of MaiDong from a vending machine and the machine give her n coins back. She places them in a line randomly showing head face or tail face o