POJ

Longest Ordered Subsequence

Time Limit: 2000MS Memory Limit: 65536KTotal Submissions: 55404 Accepted: 24843

Description

A numeric sequence of a_i is ordered if a₁ < a₂ < ... < a_N. Let the subsequence of the given numeric sequence (a₁, a₂, ..., a_N) be any sequence (a_i1, a_i2, ..., a_iK), where 1 <= i₁ < i₂ < ... < i_K <= N. For example, sequence (1, 7, 3, 5, 9, 4, 8) has ordered subsequences, e. g., (1, 7), (3, 4, 8) and many others. All longest ordered subsequences are of length 4, e. g., (1, 3, 5, 8).

Your program, when given the numeric sequence, must find the length of its longest ordered subsequence.

Input

The first line of input file contains the length of sequence N. The second line contains the elements of sequence - N integers in the range from 0 to 10000 each, separated by spaces. 1 <= N <= 1000

Output

Output file must contain a single integer - the length of the longest ordered subsequence of the given sequence.

Sample Input

71 7 3 5 9 4 8

Sample Output

4

题意：给定n个数 要求找出最长的上升子序列 可以不连续

思路：不断更新最小的数 每次输入一个新的数就从前到后遍历找到比它大的数 没有就排到最后

#include <iostream>#include <cstdio>#include <algorithm>#include <cstring>#include <queue>#include <stack>#include <vector>#define max_ 100010#define inf 0x3f3f3f3f#define ll long longusing namespace std;int dp[1010];int main(int argc, char const *argv[]){int n;while(scanf("%d",&n)!=EOF){memset(dp,-1,sizeof(dp));int i,j,cnt=1;for(i=1;i<=n;i++){int x;scanf("%d",&x);for(j=1;j<=cnt;j++){if(x<=dp[j]){dp[j]=x;break;}}if(j>cnt)dp[++cnt]=x;}printf("%d\n",cnt-1);}return 0;}