結果

問題 No.1804 Intersection of LIS
ユーザー Chanyuh
提出日時 2022-01-26 18:30:16
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 187 ms / 2,000 ms
コード長 5,916 bytes
コンパイル時間 1,752 ms
コンパイル使用メモリ 131,112 KB
最終ジャッジ日時 2025-01-27 15:27:00
ジャッジサーバーID
（参考情報） 		judge3 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 37
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include<iostream>
#include<array>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<complex>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<tuple>
#include<cassert>
using namespace std;
typedef long long ll;
const ll mod = 1000000007;
const ll INF = (ll)1000000007 * 1000000007;
typedef pair<int, int> P;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define Per(i,sta,n) for(int i=n-1;i>=sta;i--)
typedef long double ld;
const ld eps = 1e-8;
const ld pi = acos(-1.0);
typedef pair<ll, ll> LP;
int dx[4]={1,-1,0,0};
int dy[4]={0,0,1,-1};
template<class T>bool chmax(T &a, const T &b) {if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T &a, const T &b) {if(b<a){a=b;return 1;}return 0;}
template <class S, S (*op)(S, S), S (*e)()> struct SegmentTree {
  public:
    SegmentTree() : SegmentTree(0) {}
    SegmentTree(int n) : SegmentTree(std::vector<S>(n, e())) {}
    SegmentTree(const std::vector<S>& v) : _n(int(v.size())) {
        log = ceil_pow2(_n);
        size = 1 << log;
        d = std::vector<S>(2 * size, e());
        for (int i = 0; i < _n; i++) d[size + i] = v[i];
        for (int i = size - 1; i >= 1; i--) {
            update(i);
        }
    }
    void set_val(int p, S x) {
        assert(0 <= p && p < _n);
        p += size;
        d[p] = x;
        for (int i = 1; i <= log; i++) update(p >> i);
    }
    S get(int p) {
        assert(0 <= p && p < _n);
        return d[p + size];
    }
    S query(int l, int r) {
        assert(0 <= l && l <= r && r <= _n);
        S sml = e(), smr = e();
        l += size;
        r += size;
        while (l < r) {
            if (l & 1) sml = op(sml, d[l++]);
            if (r & 1) smr = op(d[--r], smr);
            l >>= 1;
            r >>= 1;
        }
        return op(sml, smr);
    }
    S all_query() { return d[1]; }
    template <bool (*f)(S)> int max_right(int l) {//f(op([l,r)))==trueを満たす最大のr
        return max_right(l, [](S x) { return f(x); });
    }
    template <class F> int max_right(int l, F f) {
        assert(0 <= l && l <= _n);
        assert(f(e()));
        if (l == _n) return _n;
        l += size;
        S sm = e();
        do {
            while (l % 2 == 0) l >>= 1;
            if (!f(op(sm, d[l]))) {
                while (l < size) {
                    l = (2 * l);
                    if (f(op(sm, d[l]))) {
                        sm = op(sm, d[l]);
                        l++;
                    }
                }
                return l - size;
            }
            sm = op(sm, d[l]);
            l++;
        } while ((l & -l) != l);
        return _n;
    }
    template <bool (*f)(S)> int min_left(int r) {//f(op([l,r)))==trueを満たす最小のl
        return min_left(r, [](S x) { return f(x); });
    }
    template <class F> int min_left(int r, F f) {
        assert(0 <= r && r <= _n);
        assert(f(e()));
        if (r == 0) return 0;
        r += size;
        S sm = e();
        do {
            r--;
            while (r > 1 && (r % 2)) r >>= 1;
            if (!f(op(d[r], sm))) {
                while (r < size) {
                    r = (2 * r + 1);
                    if (f(op(d[r], sm))) {
                        sm = op(d[r], sm);
                        r--;
                    }
                }
                return r + 1 - size;
            }
            sm = op(d[r], sm);
        } while ((r & -r) != r);
        return 0;
    }
  private:
    int _n, size, log;
    std::vector<S> d;
    void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
    int ceil_pow2(int n) {
        int x = 0;
        while ((1U << x) < (unsigned int)(n)) x++;
        return x;
    }
};
int n;
vector<int> A,inv;
int F(int a,int b){return max(a,b);}
int e(){return -mod;}
void solve(){
    cin >> n;A.resize(n);inv.resize(n);
    rep(i,n) {
        cin >> A[i];A[i]--;
        inv[A[i]]=i;
    }
    SegmentTree<int,F,e> seg1(n+1);
    seg1.set_val(n,0);
    per(i,n){
        seg1.set_val(A[i],seg1.query(A[i]+1,n+1)+1);
    }
    // rep(i,n){
    //     cout << seg.get(i) << " ";
    // }
    // cout << "" << endl;
    int K=seg1.all_query();
    vector<int> L1;
    rep(i,n){
        // rep(i,n){
        //     cout << seg1.get(i) << " ";
        // }
        // cout << "" << endl;
        int p=seg1.get(A[i]);
        if(p+L1.size()==K){
            if(!L1.empty()) if(A[L1.back()]>A[i]){
                seg1.set_val(A[i],e());
                continue;
            };
            L1.push_back(i);
        }
        seg1.set_val(A[i],e());
    }
    // rep(i,K){
    //     cout << L1[i] << " ";
    // }
    // cout << "" << endl;
    reverse(A.begin(),A.end());
    SegmentTree<int,F,e> seg2(n+1);
    seg2.set_val(0,0);
    per(i,n){
        seg2.set_val(A[i]+1,seg2.query(0,A[i]+1)+1);
    }
    vector<int> L2;
    rep(i,n){
        // rep(i,n){
        //     cout << seg2.get(i) << " ";
        // }
        // cout << "" << endl;
        int p=seg2.get(A[i]+1);
        if(p+L2.size()==K){
            if(!L2.empty()) if(A[L2.back()]<A[i]){
                seg2.set_val(A[i]+1,e());
                continue;
            };
            L2.push_back(i);
        }
        seg2.set_val(A[i]+1,e());
    }
    rep(i,K) L2[i]=n-1-L2[i];
    reverse(L2.begin(),L2.end());
    // rep(i,K) cout << L2[i] << " ";
    // cout << "" << endl;
    int m=0;
    rep(i,K) if(L1[i]==L2[i]) m++;
    reverse(A.begin(),A.end());
    cout << m << endl;
    rep(i,K) if(L1[i]==L2[i]) cout << A[L1[i]]+1 << " ";
    cout << "" << endl;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(50);
    solve();
}
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