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感谢1 1 数据,不想用stl#include<iostream>
#include<stdio.h>
#include<cmath>
#include<algorithm>
#include<cstring>
using namespace std;
int a[15],vis[15],sum[20],n,final,flag,head,temp[20];
void dfs(int k)
{
if(k==n)
{
int i,j; //i=3
for(i=1;i<=n;i++)
{
if(vis[i]==0)
{
a[k]=i;
sum[k-2]=a[k-1]+a[k];
break;
}
}
for(i=0;i<n-1;i++) temp[i]=sum[i];
i=n-1;
while((i--)>1) //i=2
{
for(j=0;j<i;j++) temp[j]=temp[j]+temp[j+1];
}
if(temp[0]==final)
{
for(i=1;i<n;i++) printf("%d ",a[i]);
printf("%d\n",a[i]);
flag=1;
}
}
else
{
for(int i=1;i<=n;i++)
{
if(vis[i]==0)
{
a[k]=i;
if(k!=1) sum[k-2]=a[k-1]+a[k];
vis[i]=1;
dfs(k+1);
if(flag) break;
vis[i]=0;
sum[k-2]-=a[k];
}
}
}
}
int main()
{
while(~scanf("%d%d",&n,&final))
{
if(n==1&&final==1) printf("1\n");
memset(vis,0,sizeof(vis));
memset(sum,0,sizeof(sum));
a[0]=0;
flag=0;
head=2;
dfs(1);
}
}
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