直接保留到小数点后10位, 有可能AC.
但是因为没有special judge所以可能依然会WA.
测试数据 #0: Accepted, time = 31 ms, mem = 656 KiB, score = 5
测试数据 #1: WrongAnswer, time = 0 ms, mem = 656 KiB, score = 0
测试数据 #2: WrongAnswer, time = 15 ms, mem = 656 KiB, score = 0
测试数据 #3: WrongAnswer, time = 0 ms, mem = 652 KiB, score = 0
测试数据 #4: WrongAnswer, time = 0 ms, mem = 652 KiB, score = 0
测试数据 #5: WrongAnswer, time = 15 ms, mem = 652 KiB, score = 0
测试数据 #6: Accepted, time = 0 ms, mem = 656 KiB, score = 5
测试数据 #7: WrongAnswer, time = 0 ms, mem = 656 KiB, score = 0
测试数据 #8: Accepted, time = 15 ms, mem = 652 KiB, score = 5
测试数据 #9: WrongAnswer, time = 31 ms, mem = 652 KiB, score = 0
保留十位,仍然悲剧。。。