Submission #309492

#	Time	Username	Problem	Language	Result	Execution time	Memory
309492		caoash	trapezoid (balkan11_trapezoid)	C++14	0 / 100	626 ms	63404 KiB

trapezoid

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

using ll = long long;

using vi = vector<int>;
using vl = vector<ll>;
#define pb push_back
#define rsz resize
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair

const int MX = 200005;
const int MOD = (int) (1e9 + 7);
const ll INF = (ll) 1e18;

namespace output {
  void pr(int x) {
    cout << x;
  }
  void pr(long x) {
    cout << x;
  }
  void pr(ll x) {
    cout << x;
  }
  void pr(unsigned x) {
    cout << x;
  }
  void pr(unsigned long x) {
    cout << x;
  }
  void pr(unsigned long long x) {
    cout << x;
  }
  void pr(float x) {
    cout << x;
  }
  void pr(double x) {
    cout << x;
  }
  void pr(long double x) {
    cout << x;
  }
  void pr(char x) {
    cout << x;
  }
  void pr(const char * x) {
    cout << x;
  }
  void pr(const string & x) {
    cout << x;
  }
  void pr(bool x) {
    pr(x ? "true" : "false");
  }

  template < class T1, class T2 > void pr(const pair < T1, T2 > & x);
  template < class T > void pr(const T & x);

  template < class T, class...Ts > void pr(const T & t,
    const Ts & ...ts) {
    pr(t);
    pr(ts...);
  }
  template < class T1, class T2 > void pr(const pair < T1, T2 > & x) {
    pr("{", x.f, ", ", x.s, "}");
  }
  template < class T > void pr(const T & x) {
    pr("{"); // const iterator needed for vector<bool>
    bool fst = 1;
    for (const auto & a: x) pr(!fst ? ", " : "", a), fst = 0;
    pr("}");
  }

  void ps() {
    pr("\n");
  } // print w/ spaces
  template < class T, class...Ts > void ps(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(" ");
    ps(ts...);
  }

  void pc() {
    cout << "]" << endl;
  } // debug w/ commas
  template < class T, class...Ts > void pc(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(", ");
    pc(ts...);
  }
  #define dbg(x...) pr("[", #x, "] = ["), pc(x);
}

#ifdef LOCAL
using namespace output;
#endif

map<int, int> cx, cy;
map<pi, pi> st;
map<pi, int> dp;

struct Node {
    int val;
};

template<int SZ> struct Seg {
    Node tree[4*SZ];

    Node merge(Node a, Node b){
        Node ret;
        ret.val = max(a.val, b.val);
        return ret;
    }
    
    void update(int v, int l, int r, int i, int x) {
        if (i > r || i < l) {
            return;
        } else if (l == r) {
            tree[v].val = x;
            return;
        } else {
            int m = (l + r) / 2;
            update(2 * v + 1, l, m, i, x);
            update(2 * v + 2, m + 1, r, i, x);
            tree[v] = merge(tree[2 * v + 1], tree[2 * v + 2]);
        }
    }

    Node query(int v, int l, int r, int ql, int qr) {
        if (l > qr || r < ql) {
            Node init;
            init.val = 0;
            return init;
        } else if (l >= ql && r <= qr) {
            return tree[v];
        } else {
            int m = (l + r) / 2;
            Node a = query(2 * v + 1, l, m, ql, qr);
            Node b = query(2 * v + 2, m + 1, r, ql, qr);
            return merge(a, b);
        }
    }
};

Seg<MX> orz;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n; cin >> n;
    vector<pair<pi, pi>> vals(n);
    set<int> xs, ys;
    for (int i = 0; i < n; i++) {
        cin >> vals[i].f.f >> vals[i].f.s;
        cin >> vals[i].s.f >> vals[i].s.s;
        xs.insert(vals[i].f.f), ys.insert(vals[i].s.f);
        xs.insert(vals[i].f.s), ys.insert(vals[i].s.s);
    }

    int pt = 0;
    for (auto v : xs) cx[v] = pt++;
    pt = 0;
    for (auto v : ys) cy[v] = pt++;

    vector<pair<pi, int>> evts;

    for (auto v : vals) {
        pi lf = mp(cx[v.f.f], cy[v.s.f]);
        pi sf = mp(cx[v.f.s], cy[v.s.s]);
        // dbg(v, lf, sf);
        st[sf] = lf;
        evts.pb(mp(lf, 0));
        evts.pb(mp(sf, 1));
    }

    sort(all(evts));

    for (auto curr : evts) {
        if (curr.s) {
            dp[curr.f] = dp[st[curr.f]];
            orz.update(0, 0, sz(cy), curr.f.s, dp[curr.f]);
        } else {
            dp[curr.f] = orz.query(0, 0, sz(cy), 0, curr.f.s).val + 1;
        }
        // dbg(curr.f, curr.s, st[curr.f], dp[curr.f]);
    }

    int ans = orz.query(0, 0, sz(cy), 0, sz(cy)).val;
    cout << ans << '\n'; 
} 

• Subtask 1: 0 / 100