求助大佬

AT1198_100 @ 2020-04-01 15:09:44

#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){
    int n,x;
    cin>>x;
    n=sqrt(2*x+1/4)-1/2;
    cout<<(n*(n+1)*(2*n+1))/6;
    return 0;
}

by Franka @ 2020-04-01 15:10:30

模拟不行吗？

by Chanter @ 2020-04-01 15:12:44

@winterzxy 精度不够

by Chanter @ 2020-04-01 15:13:08

用int类型算小数珂海星

by AT1198_100 @ 2020-04-01 15:14:21

@空与灵之白 那要开多少啊，long long吗？

by Chanter @ 2020-04-01 15:16:09

@winterzxy double类型

by AT1198_100 @ 2020-04-01 15:18:05

@空与灵之白 我开了double。。。然后变成了0分。。。

by Chanter @ 2020-04-01 15:22:39

@winterzxy 谔谔？？？

by gongyr @ 2020-04-01 15:24:11

强制转换？

by gongyr @ 2020-04-01 15:24:24

@winterzxy

by Chanter @ 2020-04-01 15:26:01

诶对哦（