```cpp
#include <iostream>
#include <algorithm>
using namespace std;
int a[1000][1000],s[10000];
long long sum=0,n,m;
int f(){
int i,j,k;
for(i=1;i<=n;i++)s[i]=i;
do{
sum=0;
for(i=1;i<=n;i++)sum+=(a[n][i]*s[i]);
if(sum==m){
for(i=1;i<=n;i++)cout<<s[i]<<" ";
return 0;
}
}
while(next_permutation(s+1,s+n+1));
}
int main(){
int i,j,k;
cin>>n>>m;
a[1][1]=1;
for(i=2;i<=n;i++)
for(j=1;j<=i;j++)
a[i][j]=a[i-1][j-1]+a[i-1][j];
f();
}
```
# 我这程序开O2有90分，不开80分。重点是90分和80分过不了的测试点不一样？？？
by judgejudge @ 2019-02-19 19:02:52
@[judgejudge](/space/show?uid=133986) o2不稳的正常现象
by lxy__ @ 2019-02-19 19:23:25
@[b612](/space/show?uid=138280) 那怎样优化呢？？？
by judgejudge @ 2019-02-19 19:31:31
@[judgejudge](/space/show?uid=133986) 看题解啊
by lxy__ @ 2019-02-19 19:33:39
@[b612](/space/show?uid=138280) 我指的是帮我改改程序。。。
by judgejudge @ 2019-02-19 19:35:21
@[judgejudge](/space/show?uid=133986)
```cpp
if(n==10 && m==1535)return 0;
```
加上这个就可以A了哦（滑稽）
by Alzkonjac @ 2019-03-16 16:59:31
这是套了数据吗。。。
by Tarsal @ 2019-04-28 20:08:15
@[judgejudge](/user/133986) 可以加上O3优化
by WuXingRui_wxr @ 2020-03-09 16:41:18
```cpp
#pragma GCC optimize(3,"Ofast","inline")
```
这个是O3优化。
by WuXingRui_wxr @ 2020-03-09 16:44:25