OJ-Problems-Source/HDOJ/2611_autoAC.cpp

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#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<cmath>
using namespace std;
int a[1001];
int n,p,len,tmp;
struct node {
int num;
int pos;
};
node tree[1001];
bool cmp(const node& x,const node& y)
{
if(x.num!=y.num)
return x.num<y.num;
else
return x.pos<y.pos;
}
void print(int x)
{
int i;
for(i=0;i<x-1;i++)
printf("%d ",a[i]);
printf("%d\n",a[i]);
}
bool dfs(int deep,int pos,int pp)
{
int pre,i;
bool flag=false;
if(deep == len)
{
tmp++;
print(deep);
if(tmp == p)
return true;
return false;
}
if(pos>n)
return false;
for(i=pos;i<n;i++)
{
if(tree[i].pos > pp )
{
if(!flag)
{
pre=tree[i].num;
flag=true;
}
else if(pre == tree[i].num)
continue;
pre=tree[i].num;
a[deep]=tree[i].num;
if(dfs(deep+1,i+1,tree[i].pos))
return true;
}
}
return false;
}
int main()
{
while(~scanf("%d%d",&n,&p))
{
int tc;
for(int i=0;i<n;i++)
{
scanf("%d",&tc);
tree[i].num=tc;
tree[i].pos=i;
}
sort(tree,tree+n,cmp);
tmp=0;
for(int i=1;i<n;i++)
{
len=i;
if(dfs(0,0,-1))
break;
}
printf("\n");
}
return 0;
}