WA的 #4 #5 #8
（竟然没有TLE！！！）
by YuRuochen @ 2022-09-07 19:39:23
启发来自于https://www.luogu.com.cn/discuss/279207
by YuRuochen @ 2022-09-07 19:42:13
已AC，代码如下（这是一条没有用处的帖子）
```cpp
#include<bits/stdc++.h>
using namespace std;
int n,num,a[1010];
long long ans;
void dfs(int k,int sum){
if(k==num){
ans+=2*sum-max(n,sum+a[k-1]+1)+2;
return;
}
for(int i=max(a[k-1]+1,(int)ceil((n+1)*1.0/(1<<(num-k))-1-sum));i<=sum+1;i++){
a[k]=i;
dfs(k+1,sum+i);
}
}
int main(){
scanf("%d",&n);
if(n==1){
printf("1 1");
return 0;
}
if(n==2){
printf("1 0");
return 0;
}
int s=1,ss=0;
while(s<n){
num++;
ss+=s;
s=ss+1;
}
a[1]=1;
dfs(2,1);
printf("%d %lld",num,ans);
return 0;
}
```
by YuRuochen @ 2022-09-07 20:16:24
@[YuRuochen](/user/658786) wyy tlqftj yjb
by YuRuochen @ 2022-09-07 20:17:09