Submission #1091805

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091805		akim9905	Matryoshka (JOI16_matryoshka)	C++17	51 / 100	2068 ms	11696 KiB

matryoshka

#include <bits/stdc++.h>
using namespace std;

#define fileio() freopen("input.txt","r",stdin); freopen("output.txt","w",stdout)
#define fio() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define all(x) (x).begin(), (x).end()
#define allr(x) x.rbegin(), x.rend()
#define cmprs(x) sort(all(x)),x.erase(unique(all(x)),x.end())
#define endl "\n"
#define sp " "
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define F first
#define S second
#define rz resize
#define sz(a) (int)(a.size())
#define clr(a) a.clear()

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef tuple<int, int, int> tpi;
typedef tuple<ll, ll, ll> tpl;
typedef pair<double, ll> pdl;
typedef pair<double, int> pdi;

const int dx[] = {1,-1,0,0,1,1,-1,-1};
const int dy[] = {0,0,1,-1,1,-1,1,-1};
const ll MOD = 1e9+7;
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
const int MAX = 202020; // PLZ CHK!

struct segtr{
    //0-indexed!
    vector<ll> tr, a;
    int n;
    void rst(int sz) {
        n=sz;
        tr.resize((n+1)<<1);
    }
    void upd(int i, ll v) {
        tr[i+n] = max(tr[i+n], v); i+=n; //AWARE OF UPD POLICY!!
        for (i>>=1; i; i>>=1) tr[i] = max(tr[i<<1], tr[i<<1|1]);
    }

    ll qry(int l, int r) {
        ll ret = -LINF;
        for (l+=n, r+=n; l<=r; l>>=1, r>>=1) {
            if (l&1) ret = max(ret, tr[l++]);
            if (~r&1) ret = max(ret, tr[r--]);
        }
        return ret;
    }
};

int N,Q;
pii A[MAX],C[MAX];

int main() {
    fio();
    cin>>N>>Q;
    for (int i=1; i<=N; i++) {
        int x,y; cin>>x>>y;
        A[i]={x,y};
    }    

    while (Q--) {
        int x,y;
        cin>>x>>y;
        vector<pii> B; B.pb({0,0});
        vector<int> Y; Y.pb(0);
        for (int i=1; i<=N; i++) {
            if (x<=A[i].F && A[i].S<=y) {
                B.pb(A[i]);
                Y.pb(A[i].S);
            }
        }
        sort(all(B),[](pii a, pii b){
            if (a.F==b.F) return a.S>b.S;
            return a.F<b.F;
        });
        cmprs(Y);

        int M=sz(B)-1;
        for (int i=1; i<=M; i++) {
            B[i].S=lb(all(Y),B[i].S)-Y.begin()+1;
        }

        segtr seg; seg.rst(M+10);
        vector<int> dp(M+10);
        
        for (int i=M; i>=1; i--) {
            dp[i]=seg.qry(0,B[i].S)+1;
            seg.upd(B[i].S,dp[i]);
        }

        cout<<*max_element(all(dp))<<endl;
    }
    return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 0 / 49