为什么写这一道呢,,,
因为这一道水啊,基础之基础之中的基础啊,,,,然而很简单啊,,,
简单的一道动态规划,最长上升子序列,,,LIS(Longest Increasing Subsequence)
dp[i]表示第i个数结尾的最长上升子序列的长度,,,//这里是数值
初始是dp[i]=1;seg[i]储存第i个数;
状态转移方程dp[i]=max(dp[i],dp[j]+1);
如果seg[j]<seg[i]并且j<i的话,就更新,取最大值;
# include <cstdio>
# include <iostream>
# include <algorithm>
# include <cstring>
using namespace std;
int n;
const int maxn=1e3+5;
int dp[maxn],seg[maxn];
int main(){
while(scanf("%d",&n)!=EOF&&n){
for(int i=0;i<n;i++)
scanf("%d",&seg[i]);
int ans=0;
for(int i=0;i<n;i++){
dp[i]=seg[i];
for(int j=0;j<i;j++){
if(dp[i]<dp[j]+seg[i]&&seg[j]<seg[i]){
dp[i]=max(dp[i],dp[j]+seg[i]);
}
}
ans=max(ans,dp[i]);
}
printf("%d\n",ans);
}
return 0;
}