最长不下降子序列nlogn模板

 

#include <bits/stdc++.h>


using namespace std;
int d[100011],n,len,a[100011];


int main(){
//    freopen(".in","r",stdin);
//    freopen(".out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;i++)scanf("%d",&a[i]);
    len=1;
    d[1]=a[1];
    for(int i=2;i<=n;i++){
        if(a[i]==d[len])continue;
        if(a[i]>d[len])d[++len]=a[i];
        else *lower_bound(d+1,d+1+len,a[i])=a[i];
    }
    printf("%d",len);

    return 0;
}