Problem Check Points 250 ○ 204.20 500 ○ 222.36 1000 - - 「問題が面白くない」と不評でした。力技だもんなぁ。

五角数は で生成される. 最初の10項は1, 5, 12, 22, 35, 51, 70, 92, 117, 145, ... である.である. しかし差 70 - 22 = 48は五角数ではない.五角数のペア とについて, 差と和が五角数になるものを考える. 差を と書く. 差 D の最小値を求めよ.

Description Larry graduated this year and finally has a job. He's making a lot of money, but somehow never seems to have enough. Larry has decided that he needs to grab hold of his financial portfolio and solve his financing problems. The …

Description An army of ants walk on a horizontal pole of length l cm, each with a constant speed of 1 cm/s. When a walking ant reaches an end of the pole, it immediatelly falls off it. When two ants meet they turn back and start walking in…