Submission #45631

#	Time	Username	Problem	Language	Result	Execution time	Memory
45631		Jatana	Port Facility (JOI17_port_facility)	C++17	100 / 100	3894 ms	193412 KiB

port_facility

/*
                                                                                                     
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                                           `//:-------:/:`                                          
                                          .+:--.......--:+`                                         
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                                       `/y+o/---....---:+o.                                         
                                   `...````-os+/:---:/+o/--.`                                       
              `-/+++++/:.      `...`       :h+d+oooo+/+-`   ...                                     
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           `o+/::------://o/`           `-` -.          -`       `..`                               
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          `:s+/:--....-::/+s-`      .-   `-                -`           -///:--------:/:`           
           ./s+//:::::://oo-``..НЕЙРОННУЮ: СЕТЬ:::::::-`РАБОТЯГИ        `+:--........--:/`          
            .:ooo+++++osso-`    `.:-...`/` ./::-------:/:`   -`         :+--..``````.--:+:...-+:-`  
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                `.---..``-..-    .-/..`````-oo+/:::::/+o+-        `-``-`  `-.  ````                 
             `:++++/+++++-  ..``.-/:`      /y-:/++o++/:.`..`       ./.   `-                         
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            `./+oooooooo+/.`-    .-:...`.. .//:-------://`        `- `..` `:.                       
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                        -` .-`.-`     -.`-o/--...```..--:+/.``-:....``:-.+:--....`...--:+`          
                       ..`-.   `-.   ``:os:o/:---...---:++.  `-     ``///+:-..``````.--:+-````-.`   
              `.:///////.-`      .:-..` -``-+o+/:::::/+o/.  `-         `:+:-..`````..--:o/:--/ys+-  
            `-++///////+o/. ``....`-.    :` `.:++++++/:.`  .-           -o/---......---/o.   `.`    
           `++//:-----::/+o:..`     .-`   :    ```````    .-           `+so+:--------:++-`          
  `````:-``:o/::-..`..--:/+o`         -.  `-             .-          `../../+o+////+o+:.`           
  -----syo/o+/:--.```..-://s.          .-` `-           .-        `...     ``-:////:-``             
       .` `/s//:--....-::/+s.            -. `-`        .-       `..`                                
           .+o+/:::--:://+s/-..`          .::+y  ```  .-     `..`                                   
            ./oo++////+oso-`   `....       :y-+:::::::/`   ...                                      
             `.:+oooooo/-`         `....-. .//:-------:/:-.`                                        
                ``...``                 /+:+:--.......--:+`                                         
                                         `+:--..`````..--//`                                        
                                         .o:--..`` ``..--:o`                                        
                                         .+/--...```..--:+/`                                        
                                         `-o/:---...---:++.                                         
                                          `-+o+/:---:/+o/.                                          
                                            `.:+oooo+/-.`                                           
                                               ``````                                               
*/
 
#ifdef aimbot
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#endif
 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <map>
#include <set>
#include <queue>
#include <ostream>
#include <istream>
#include <typeinfo>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <limits>
#include <fstream>
#include <array>
#include <list>
#include <bitset>
#include <functional>
#include <random>
#include <cstring>
 
#define mt make_tuple
#define x first
#define y second
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define umap unordered_map
#define uset unordered_set
#define elif else if
#define len(v) ((int)v.size())
#define f(i, n) for (int i = 0; i < (n); i++)
#define rof(i, n) for (int i = ((n) - 1); i >= 0; i--) 
#define apply(v, act) for (auto &x : v) { act; }
#define fuck(args...) {string s = #args;deque<string> deq;\
string buf = "";int bal = 0;for (char c : s) {\
if (c == '(' || c == '[' || c == '{') {bal++;\
} else if (c == ')' || c == ']' || c == '}') {\
bal--;} else {if (bal == 0) {if (c == ',') {\
deq.pb(buf);buf = "";} else {if (c != ' ') {\
buf += c;}}}}}if (!buf.empty()) {deq.pb(buf);}\
smart_io::precall_print();smart_io::_print(deq, args);}
 
#define print    \
smart_io::precall_print(); \
cout,
 
#define scan cin,
 
 
using namespace std;
 
char string_in_buffer[(int)260];
 
 
void fast_scan(int &x) { scanf("%d", &x); }
void fast_scan(long long &x) { scanf("%lld", &x); }
void fast_scan(unsigned long long &x) { scanf("%llu", &x); }
void fast_scan(double &x) { scanf("%lf", &x); }
void fast_scan(long double &x) { scanf("%Lf", &x); }
void fast_scan(char &x) { 
	scanf("%c", &x); 
	if (x == '\n') {
		fast_scan(x);
	}
}
void fast_scan(string &x) {
	scanf("%s", string_in_buffer);
	x = string(string_in_buffer);
}
 
template<class TFirst, class TSecond>
void fast_scan(pair<TFirst, TSecond> &p) {
	fast_scan(p.first);
	fast_scan(p.second);
}
 
template <class T>
void fast_scan(vector<T> &v) {
	for (auto &x : v) fast_scan(x);
}
 
void fast_print(const int &x) { printf("%d", x); }
void fast_print(const long long &x) { printf("%lld", x); }
void fast_print(const unsigned long long &x) { printf("%llu", x); }
void fast_print(const double &x) { printf("%.15lf", x); }
void fast_print(const long double &x) { printf("%.15Lf", x); }
void fast_print(const char &x) { printf("%c", x); };
void fast_print(const string &x) { printf("%s", x.c_str());}
void fast_print(const char v[]) { fast_print((string)v); }
 
template<class TFirst, class TSecond>
void fast_print(const pair<TFirst, TSecond> &p) {
	fast_print(p.first);
	fast_print(' ');
	fast_print(p.second);
}
 
template <class T>
void fast_print(const vector<T> &v) {
	if (v.empty()) return;
	fast_print(v[0]);
	for (int i = 1; i < v.size(); i++) {
		fast_print(' ');
		fast_print(v[i]);
	}
}
 
template <class T>
void fast_print(const vector<vector<T>> &v) {
	if (v.empty()) return;
	fast_print(v[0]);
	for (int i = 1; i < v.size(); i++) {
		fast_print('\n');
		fast_print(v[i]);
	}
}
 
template <class T>
void fast_print(const T &v) {
	for (const auto &x : v) {
		fast_print(x);
		fast_print(' ');
	}
}
 
 
using namespace std;
 
 
namespace smart_io {
	string print_start = "";
	string sep = " ";
	bool first_print = false;
 
	void precall_print() {
		fast_print(print_start);
		print_start = "\n";
		first_print = true;
	}
 
	void _print(deque<string>) {}
	template<class T, class... Args>
	void _print(deque<string> names, T kek, Args... args) {
		if (!first_print) {
			fast_print("\n");
		} else {
			first_print = false;
		}
		fast_print(names.front());
		fast_print(" = ");
		fast_print(kek);
		names.pop_front();
		_print(names, args...);
	}
} //namespace smart_io
 
 
template <class T>
ostream &operator,(ostream &os, const T &object) {
	if (!smart_io::first_print) {
		fast_print(smart_io::sep);
	} else {
		smart_io::first_print = false;
	}
	fast_print(object);
	return os;
}
 
template <class T>
istream &operator,(istream &is, T &object) {
	fast_scan(object);
	return is;
}
 
namespace typedefs {
	typedef long long ll;
	typedef unsigned long long ull;
	typedef pair<int, int> pii;
	typedef long double ld;
}
 
namespace numbers_operation {
	template<class T>
	T floor_mod(T a, T b) {
		if (a % b == 0) return 0;
		if (a >= 0 && b >= 0) return a % b;
		if (a <= 0 && b <= 0) return a % b;
		return abs(b) - (abs(a) % abs(b));
	}
}
 
using namespace numbers_operation;
using namespace typedefs;
 
const ll MOD = 1e9 + 7;
 
int n;
vector<pii> v;
 
struct Node {
	Node *l = NULL, *r = NULL;	
	int value = 0;	
	int tl, tr; 
 
	bool is_list() {
		return tl + 1 == tr;
	}
 
	bool included_by(int ql, int qr) {
		return ql <= tl && tr <= qr;
	}
 
	bool intersects(int ql, int qr) {
		return !(qr <= tl || tr <= ql);
	}
 
	Node(int _tl, int _tr) {
		tl = _tl;
		tr = _tr;
 
		if (!is_list()) {
			int mid = (tl + tr) / 2;
			l = new Node(tl, mid);
			r = new Node(mid, tr);
		}
	}
 
	void upd_zero(int ql, int qr) {
		if (is_list()) {
			value = 0;
		} else {
			if (l->intersects(ql, qr)) {
				l->upd_zero(ql, qr);
			}
			if (r->intersects(ql, qr)) {
				r->upd_zero(ql, qr);
			}
			value = 0;
		}
	}
 
	int query(int ql, int qr) {
		if (included_by(ql, qr)) {
			return value;
		} else {
			int rez = 0;
			if (l->intersects(ql, qr)) {
				rez += l->query(ql, qr);
			}
			if (r->intersects(ql, qr)) {
				rez += r->query(ql, qr);
			}
			return rez;
		}
	}
 
	void inc(int i, int d) {
		if (is_list()) {
			value += d;
		} else {
			if (i < l->tr) {
				l->inc(i, d);
			} else {
				r->inc(i, d);
			}
			value = l->value + r->value;
		}
	}
};
 
struct Event {
	int x;
	int id;	
	bool open = false;
 
	Event() {}
	Event(int _x, int _id, bool _open) {
		x = _x;
		id = _id;
		open = _open;
	}
};
 
vector<Event> es;
vector<vector<int>> g;
 
vector<int> color;
 
void dfs(int v) {
	for (int sub : g[v]) {
		if (color[sub] == color[v]) {
			print 0;
			exit(0);
		}
		if (color[sub] == 0) {
			color[sub] = 3 - color[v];
			dfs(sub);
		}
	}
}

struct SUS {
	vector<int> up;

	SUS(int n) {
		up.resize(n);
		f(i, n) {
			up[i] = i;
		}	
	}

	int get_root(int v) {
		if (up[v] == v) return v;
		return up[v] = get_root(up[v]);
	}

	void merge(int a, int b) {
		a = get_root(a);
		b = get_root(b);
		up[a] = b;
	}

	int comps() {
		set<int> roots;
		f(i, len(up)) {
			roots.insert(get_root(i));
		}
		return len(roots);
	}
};
 
signed main(signed argc, char *argv[]) {
	{
		scan n;
		v.resize(n);
		scan v;
		g.resize(n);
	}	
	{
		f(i, n) {
			pii p = v[i];
			es.emplace_back(p.x, i, true);
			es.emplace_back(p.y, i, false);
		}
	}	
	{
		sort(es.begin(), es.end(), [](Event a, Event b) {
			return a.x < b.x;
		});
	}
	{
		SUS sus(n);
		vector<set<int>> opens;
		vector<pii> edges;
		for (Event e : es) {
			if (e.open) {
				opens.pb({e.id});
			} else {
				int i = len(opens) - 1;
				int pref = -1;
				set<int> all;
				while (!opens[i].count(e.id)) {
					int __mn = v[*opens[i].begin()].y;
					// for (int x : opens[i]) {
					// 	__mn = min(__mn, v[x].y);
					// }
					if (__mn < pref) {
						print 0;
						return 0;
					}
					// for (int x : opens[i]) {
					// 	pref = max(pref, v[x].y);
					// }
					pref = v[*opens[i].begin()].y;
					i--;
				}
				int base = *opens[i].begin();
				int base_op = i + 1 < len(opens) ? *opens[i + 1].begin() : -1;
				if (e.id == 2) {
					// print len(opens[1]), *opens[1].begin(), base, i;
				}
				if (i + 1 < len(opens)) {
					// print "!", "ADD", base, *opens[i + 1].begin();
					// sus.merge(base, *opens[i + 1].begin());
					edges.emplace_back(base, *opens[i + 1].begin());
				}
				for (int j = i + 2; j < len(opens); j++) {
					for (int x : opens[j]) {
						opens[i + 1].insert(x);
					}
					// print "ADD", base, *opens[j].begin(), v[e.id];
					sus.merge(base_op, *opens[j].begin());
				}
				while (len(opens) > i + 2) {
					opens.pop_back();
				}
				opens[i].erase(e.id);
				if (opens[i].empty()) {
					opens.erase(opens.begin() + i);
				}
			}
		}
		for (pii e : edges) {
			g[sus.get_root(e.x)].pb(sus.get_root(e.y));
			g[sus.get_root(e.y)].pb(sus.get_root(e.x));
		}
		ll rez = 1;
		color.resize(n);
		f(i, n) {
			int v = sus.get_root(i);
			if (color[v] == 0) {
				rez *= 2;
				rez %= MOD;
				color[v] = 1;
				dfs(v);	
			}
		}
		print rez;
	}
}

Compilation message (stderr)

port_facility.cpp: In function 'void fast_scan(int&)':
port_facility.cpp:123:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 void fast_scan(int &x) { scanf("%d", &x); }
                          ~~~~~^~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(long long int&)':
port_facility.cpp:124:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 void fast_scan(long long &x) { scanf("%lld", &x); }
                                ~~~~~^~~~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(long long unsigned int&)':
port_facility.cpp:125:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 void fast_scan(unsigned long long &x) { scanf("%llu", &x); }
                                         ~~~~~^~~~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(double&)':
port_facility.cpp:126:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 void fast_scan(double &x) { scanf("%lf", &x); }
                             ~~~~~^~~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(long double&)':
port_facility.cpp:127:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 void fast_scan(long double &x) { scanf("%Lf", &x); }
                                  ~~~~~^~~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(char&)':
port_facility.cpp:129:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%c", &x); 
  ~~~~~^~~~~~~~~~
port_facility.cpp: In function 'void fast_scan(std::__cxx11::string&)':
port_facility.cpp:135:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", string_in_buffer);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 56 / 56
• Subtask 4: 22 / 22