【HDU】-5748-Bellovin（LIS，变化）

Bellovin

Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)

Total Submission(s): 996    Accepted Submission(s): 447


Problem Description

Peter has a sequence a1,a2,...,an and
he define a function on the sequence -- F(a1,a2,...,an)=(f1,f2,...,fn),
where fi is
the length of the longest increasing subsequence ending with ai.

Peter would like to find another sequence b1,b2,...,bn in
such a manner that F(a1,a2,...,an) equals
to F(b1,b2,...,bn).
Among all the possible sequences consisting of only positive integers, Peter wants the lexicographically smallest one.

The sequence a1,a2,...,an is
lexicographically smaller than sequence b1,b2,...,bn,
if there is such number i from 1 to n,
that ak=bk for 1≤k<i and ai<bi.

 

Input

There are multiple test cases. The first line of input contains an integer T,
indicating the number of test cases. For each test case:

The first contains an integer n (1≤n≤100000) --
the length of the sequence. The second line contains n integers a1,a2,...,an (1≤ai≤109).

 

Output

For each test case, output n integers b1,b2,...,bn (1≤bi≤109) denoting
the lexicographically smallest sequence.

 

Sample Input

3
1
10
5
5 4 3 2 1
3
1 3 5

 

Sample Output

1
1 1 1 1 1
1 2 3

 
题解：求最长上升子序列的变化题目。

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define INF 0x3f3f3f3f
#define CLR(a,b) memset(a,b,sizeof(a))
int a[100010];
int dp[100010];
int g[100010];
int main()
{
int u;
scanf("%d",&u);
while(u--)
{
CLR(a,0);
int n,i;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
scanf("%d",&a[i]);
g[i]=INF;
dp[i]=0; //初始化 dp[i]=0
}
int ans=0;
for(i=1;i<=n;i++)
{
int k=lower_bound(g+1,g+1+n,a[i])-g;
dp[i]=max(k,dp[i]); //变化主要在这，理解。
g[k]=min(g[k],a[i]); //g[k]第k位现在的值，要求一直可以小就小
}
for(i=1;i<n;i++)
printf("%d ",dp[i]);
printf("%d\n",dp
);
}
return 0;
}