Cod sursa(job #2445949)

Utilizator IoanaDraganescuIoana Draganescu IoanaDraganescu Data 6 august 2019 13:38:12
Problema Subsir crescator maximal Scor 70
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.45 kb
#include <iostream>
#include <fstream>
#include <algorithm>
#include <stack>

using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

struct scmax{
    int poz, val;
}v[100005];
int aib[100005], n, d[100005], prec[100005], init[100005];
stack <int> st;

void read(){
    fin >> n;
    for (int i = 1; i <= n; i++){
        fin >> init[i];
        v[i].val = init[i];
        v[i].poz = i;
    }
}

int compare(scmax x, scmax y){
    if (x.val == y.val)
        return x.poz > y.poz;
    return x.val < y.val;
}

void update(int poz){
    for (int i = poz; i <= n; i += i & (-i))
        if (d[poz] > d[aib[i]])
            aib[i] = poz;
}

int cauta(int poz){
    int sol = 0;
    for (int i = poz; i > 0; i -= i & (-i))
        if (d[aib[i]] > d[sol])
            sol = aib[i];
    return sol;
}

void solve(){
    sort(v + 1, v + n + 1, compare);
    int imax = 0;
    for (int i = 1; i <= n; i++){
        int poz = cauta(v[i].poz - 1);
        prec[v[i].poz] = poz;
        d[v[i].poz] = d[poz] + 1;
        if (d[v[i].poz] > d[imax])
            imax = v[i].poz;
        update(v[i].poz);
    }
    fout << d[imax] << '\n';
    while (imax > 0){
        st.push(imax);
        imax = prec[imax];
    }
    while (!st.empty()){
        int i = st.top();
        st.pop();
        fout << init[i] << ' ';
    }
    fout << '\n';
}

int main(){
    read();
    solve();
    return 0;
}