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#include<iostream>
#include<fstream>
#define min(a,b) ((a<b)?a:b)
using namespace std;
#define MAXLEN 100005
int sir[MAXLEN];
int parent[MAXLEN];
int vals[MAXLEN];
int len=0;
int last;
int binary_search(int val,int N)
{
int i, step;
for (step = 1; step < N; step <<= 1);
for (i = 0; step; step >>= 1)
if (i + step < N && vals[i + step] <= val)
i += step;
return i;
}
void func(int N)
{
vals[0]=sir[0];parent[0]=0;len=1;
for(int i=1;i<N;i++)
{
int poz=binary_search(sir[i],len);
// cout<<"Found "<<sir[i]<<" on poz "<<poz<<endl;
if( sir[i]>vals[poz] && vals[poz+1]==0)
{
// cout<<"intra"<<endl;
//parent[++poz]=
vals[++poz]=sir[i];len++;last=i;
}
else {
if (vals[poz] < sir[i] && vals[poz+1]!=0 && poz==len-2)
vals[poz + 1] = min(vals[poz + 1], sir[i]);
else if(vals[poz]>sir[i] && poz==len)
vals[poz]=min(vals[poz], sir[i]);
}
// cout<<"Vals: ";
// for(int j=0;j<10;j++)
// cout<<vals[j]<<" ";
// cout<<"|"<<len<<endl;
}
// len++;
}
int main() {
int N;
fstream f, g;
f.open("scmax.in", ios::in);
g.open("scmax.out", ios::out);
f >> N;
for (int i = 0; i < N; i++) {
f >> sir[i];
}
// for(int i=0;i<N;i++)
// {
// cout<<sir[i]<<" ";
// }
func(N);
// cout<<endl;
g << len << " " << endl;
for(int i=0;i<len;i++)
g<<vals[i]<<" ";
}