@[BoyuZhang](/user/781722) 不要用``freopen``
by williamY @ 2023-10-11 18:10:33
e,我AC了
请教一下，为什么吧
```cpp
cout<<pow(2,i)<<" ";
```
改成
```cpp
cout<<(int)pow(2,i)<<" ";
```
就行了呢？？？
by BoyuZhang @ 2023-10-11 18:12:53
sorry,那个……代码贴错了
```cpp
#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int n,k;
int m[1000];
int main(){
//freopen("P7071.in","r",stdin);
//freopen("P7071.out","w",stdout);
cin>>n;
if(n%2==1){
cout<<-1;
return 0;
}
for(int i=0;n>0;i++){
m[i]=n%2;
n/=2;
k++;
}
for(int i=k-1;i>=0;i--){
if(m[i]>0){
cout<<pow(2,i)<<" ";
}
}
}
```
by BoyuZhang @ 2023-10-11 18:13:51
```
#include<bits/stdc++.h>
using namespace std;
const int maxn=100005;
int n;
long long now=1;
bool a[105];
int main()
{
scanf("%d",&n);
if (n%2!=0)
{
printf("-1");
return 0;
}
int i=0;
while(now*2<=n)
{
now*=2;
i++;
}
int i1=i;
while(now>1)
{
if (n-now>=0)
{
a[i1]=1;
n-=now;
}
i1--;
now/=2;
}
for (int j=i;j>=1;--j)
{
if (a[j]==0) continue;
long long ans=pow(2,j);
printf("%lld ",ans);
}
return 0;
}
```
by masiyudr @ 2023-10-11 18:18:07
@[BoyuZhang](/user/781722) 首先你要知道pow()返回的是double，double怎么输出就比较随性了。
比如说可能会变成科学计数法或者带小数，算起来精度也有问题。
by wosile @ 2023-10-11 18:55:54
@[wosile](/user/280243) @[mjb023](/user/982155)
感谢大佬指教
by BoyuZhang @ 2023-10-11 18:58:01