送你一个正解：
```cpp
#include<bits/stdc++.h>
using namespace std;
string run(int x,int i=0,string s=string("")){
if(x==0)return string("0");
do if(x&1)s=(i==1?"2":"2("+run(i)+")")+(s==""?"":"+")+s;
while(++i,x>>=1);
return s;
}
int main(){
int x;cin>>x;
cout<<run(x)<<endl;
}
by Master2021 @ 2021-10-17 15:16:51
朋友啊，你肯定是重叠了，让测试案例一直到不了你的else后
正解很简单：
``` cpp
#include<iostream>
using namespace std;
int f[20] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768};
void t(int x){
int i = 0;
bool z = 0;
for(i = 14; i >= 0; i--){
if(f[i] <= x){
if(i == 1){
if(z){
cout<<"+";
}
z = 1;
cout << 2;
x = x - 2;
continue;
}
if(z){
cout << "+";
}
z = 1;
cout << "2(";
if(i > 2){
t(i);
}
else if(i == 2){
cout << 2;
}
else{
cout << "0";
}
x = x - f[i];
cout << ")";
}
}
}
int main()
{
int n = 0;
cin >> n;
t(n);
return 0;
}
```
by miku_Silent @ 2021-10-17 16:52:01