不是一样的吗:arccos函数你$acos(-1)=\pi,acos(0)=\frac{\pi}{2},acos(1)=0$
by 海之眷恋8 @ 2019-02-26 21:12:08
~~都9102年了还有人说这道题~~
by 豌豆射手皮0608 @ 2019-02-26 21:24:02
`3.141592653589`就过了
by eiheiheihei @ 2020-09-26 10:58:05
cout一定要fixed啊不然精度都给你吃了
by donkeys @ 2021-07-21 14:35:15
@[eiheiheihei](/user/241659) 我装B用3.141592653589793238462643383279502884197169399375,然后没过(可能是精度问题)
by 1004779564bzbjj @ 2022-07-16 19:22:41
cmath库里有一个常量M_PI,比手敲的圆周率快而且精准
by ljlbj_fengyuwuzu @ 2023-02-07 12:37:01
其实这题的π=3.141592653589就刚好AC了
by xcjsb @ 2023-07-06 08:40:01