oj.uz

Submission #417109

# Submission time Handle Problem Language Result Execution time Memory
417109 2021-06-03T11:50:38 Z pavement Event Hopping 2 (JOI21_event2) C++17
1 / 100
 256 ms 66132 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
#define int long long
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define g0(a) get<0>(a)
#define g1(a) get<1>(a)
#define g2(a) get<2>(a)
#define g3(a) get<3>(a)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef double db;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tree<iii, null_type, greater<iii>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int N, K, L[500005], R[500005], A[500005], ft2[500005], ft3[500005];
vector<int> ans, v;
set<ii> cfm, ft[500005];
set<iii> S;
vector<iii> tmp;

bool intersect(int a, int b, int c, int d) {
	if (a > c) swap(a, c), swap(b, d);
	return b > c;
}

inline int ls(int x) { return x & -x; }

ii qry(int p) {
	ii ret = mp(LLONG_MAX, LLONG_MAX);
	for (; p <= 2 * N; p += ls(p))
		if (!ft[p].empty()) ret = min(ret, *ft[p].begin());
	return ret;
}

void potadd(int x) {
	for (int p = L[x]; p; p -= ls(p))
		ft[p].emplace(R[x], x);
}

void potdel(int x) {
	for (int p = L[x]; p; p -= ls(p))
		ft[p].erase(mp(R[x], x));
}

int ft2_qry(int p) {
	int r = 0;
	for (; p; p -= ls(p)) r += ft2[p];
	return r;
}

void ft2_upd(int p, int v) {
	for (; p <= 2 * N; p += ls(p)) ft2[p] += v;
}

int ft3_qry(int p) {
	p = 2 * N - p + 1;
	int r = 0;
	for (; p; p -= ls(p)) r += ft3[p];
	return r;
}

void ft3_upd(int p, int v) {
	p = 2 * N - p + 1;
	for (; p <= 2 * N; p += ls(p)) ft3[p] += v;
}


void addseg(int x) {
	int lim;
	auto it = S.lower_bound(mt(R[x], 0ll, 0ll));
	if (it == S.end()) lim = LLONG_MAX;
	else lim = g0(*it);
	vector<set<iii>::iterator> todel;
	while (1) {
		if (it == S.begin()) break;
		--it;
		if (intersect(g0(*it), g1(*it), L[x], R[x])) {
			ft2_upd(g1(*it), -1);
			ft3_upd(g0(*it), -1);
			todel.pb(it);
		} else break;
	}
	for (auto i : todel) S.erase(i);
	ft2_upd(R[x], 1);
	ft3_upd(L[x], 1);
	S.emplace(L[x], R[x], x);
	auto tmp = qry(R[x]);
	if (tmp.second != LLONG_MAX && tmp.first <= lim) {
		potdel(tmp.second);
		addseg(tmp.second);
	}
}

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> N >> K;
	for (int i = 1; i <= N; i++) cin >> L[i] >> R[i], v.pb(L[i]), v.pb(R[i]);
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	for (int i = 1; i <= N; i++) {
		L[i] = lower_bound(v.begin(), v.end(), L[i]) - v.begin() + 1;
		R[i] = lower_bound(v.begin(), v.end(), R[i]) - v.begin() + 1;
		tmp.eb(R[i], L[i], i);
	}
	sort(tmp.begin(), tmp.end());
	int lastr = LLONG_MIN;
	for (auto [r, l, i] : tmp) {
		if (lastr <= l) {
			addseg(i);
			lastr = r;
		} else potadd(i);
	}
	if (S.size() < K) return cout << "-1\n", 0;
	for (int i = 1; i <= N; i++) {
		auto it = cfm.lower_bound(mp(R[i], 0ll));
		bool yep = 1;
		if (it != cfm.begin()) {
			--it;
			if (intersect(it->first, it->second, L[i], R[i])) yep = 0;
		}
		if (!yep) continue;
		A[i] = ft2_qry(L[i]) + ft3_qry(R[i]) + 1;
		auto tmp = qry(R[i]);
		auto it2 = S.lower_bound(mt(R[i], 0ll, 0ll));
		if (tmp.second != LLONG_MAX && (it2 == S.end() || tmp.first <= g0(*it2))) A[i]++;
		if (A[i] >= K) {
			cfm.emplace(L[i], R[i]);
			ans.pb(i);
			addseg(i);
		}
	}
	assert(ans.size() >= K);
	for (int i = 0; i < K; i++) cout << ans[i] << '\n';
}

Compilation message

event2.cpp:107:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  107 | main() {
      | ^~~~
event2.cpp: In function 'int main()':
event2.cpp:127:15: warning: comparison of integer expressions of different signedness: 'std::set<std::tuple<long long int, long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
  127 |  if (S.size() < K) return cout << "-1\n", 0;
      |      ~~~~~~~~~^~~
In file included from /usr/include/c++/10/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:45,
                 from /usr/include/c++/10/ext/pb_ds/detail/container_base_dispatch.hpp:90,
                 from /usr/include/c++/10/ext/pb_ds/assoc_container.hpp:48,
                 from event2.cpp:2:
event2.cpp:146:20: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
  146 |  assert(ans.size() >= K);
      |         ~~~~~~~~~~~^~~~

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23756 KB Output is correct
2 Correct 14 ms 23808 KB Output is correct
3 Correct 16 ms 23756 KB Output is correct
4 Correct 250 ms 50828 KB Output is correct
5 Correct 223 ms 51224 KB Output is correct
6 Correct 227 ms 51796 KB Output is correct
7 Correct 223 ms 51760 KB Output is correct
8 Correct 223 ms 51892 KB Output is correct
9 Correct 219 ms 51756 KB Output is correct
10 Correct 238 ms 51776 KB Output is correct
11 Correct 214 ms 51644 KB Output is correct
12 Incorrect 256 ms 66132 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #2
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23756 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 13 ms 23772 KB Output is correct
4 Correct 13 ms 23784 KB Output is correct
5 Correct 14 ms 23792 KB Output is correct
6 Correct 13 ms 23812 KB Output is correct
7 Correct 15 ms 23812 KB Output is correct
8 Correct 14 ms 23732 KB Output is correct
9 Correct 15 ms 23756 KB Output is correct
10 Correct 13 ms 23756 KB Output is correct
11 Correct 13 ms 23756 KB Output is correct
12 Correct 16 ms 23756 KB Output is correct
13 Correct 15 ms 23796 KB Output is correct
14 Correct 14 ms 23808 KB Output is correct
15 Correct 13 ms 23808 KB Output is correct
16 Correct 13 ms 23776 KB Output is correct
17 Correct 14 ms 23828 KB Output is correct
18 Correct 13 ms 23756 KB Output is correct
19 Correct 13 ms 23728 KB Output is correct
20 Correct 13 ms 23756 KB Output is correct
21 Correct 13 ms 23752 KB Output is correct
22 Correct 13 ms 23756 KB Output is correct
23 Correct 13 ms 23808 KB Output is correct
24 Correct 13 ms 23756 KB Output is correct
25 Correct 13 ms 23808 KB Output is correct
26 Correct 13 ms 23756 KB Output is correct
27 Correct 13 ms 23788 KB Output is correct

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23756 KB Output is correct
2 Correct 13 ms 23812 KB Output is correct
3 Correct 13 ms 23772 KB Output is correct
4 Correct 13 ms 23784 KB Output is correct
5 Correct 14 ms 23792 KB Output is correct
6 Correct 13 ms 23812 KB Output is correct
7 Correct 15 ms 23812 KB Output is correct
8 Correct 14 ms 23732 KB Output is correct
9 Correct 15 ms 23756 KB Output is correct
10 Correct 13 ms 23756 KB Output is correct
11 Correct 13 ms 23756 KB Output is correct
12 Correct 16 ms 23756 KB Output is correct
13 Correct 15 ms 23796 KB Output is correct
14 Correct 14 ms 23808 KB Output is correct
15 Correct 13 ms 23808 KB Output is correct
16 Correct 13 ms 23776 KB Output is correct
17 Correct 14 ms 23828 KB Output is correct
18 Correct 13 ms 23756 KB Output is correct
19 Correct 13 ms 23728 KB Output is correct
20 Correct 13 ms 23756 KB Output is correct
21 Correct 13 ms 23752 KB Output is correct
22 Correct 13 ms 23756 KB Output is correct
23 Correct 13 ms 23808 KB Output is correct
24 Correct 13 ms 23756 KB Output is correct
25 Correct 13 ms 23808 KB Output is correct
26 Correct 13 ms 23756 KB Output is correct
27 Correct 13 ms 23788 KB Output is correct
28 Correct 19 ms 25224 KB Output is correct
29 Correct 18 ms 25180 KB Output is correct
30 Correct 19 ms 25164 KB Output is correct
31 Correct 23 ms 25256 KB Output is correct
32 Correct 19 ms 25228 KB Output is correct
33 Correct 19 ms 25164 KB Output is correct
34 Correct 18 ms 25232 KB Output is correct
35 Correct 19 ms 24548 KB Output is correct
36 Correct 19 ms 24524 KB Output is correct
37 Correct 22 ms 24728 KB Output is correct
38 Correct 17 ms 24524 KB Output is correct
39 Correct 19 ms 24652 KB Output is correct
40 Correct 19 ms 24720 KB Output is correct
41 Correct 19 ms 24716 KB Output is correct
42 Correct 16 ms 24524 KB Output is correct
43 Incorrect 19 ms 25036 KB Output isn't correct
44 Halted 0 ms 0 KB -

Subtask #4
0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23756 KB Output is correct
2 Correct 14 ms 23808 KB Output is correct
3 Correct 16 ms 23756 KB Output is correct
4 Correct 250 ms 50828 KB Output is correct
5 Correct 223 ms 51224 KB Output is correct
6 Correct 227 ms 51796 KB Output is correct
7 Correct 223 ms 51760 KB Output is correct
8 Correct 223 ms 51892 KB Output is correct
9 Correct 219 ms 51756 KB Output is correct
10 Correct 238 ms 51776 KB Output is correct
11 Correct 214 ms 51644 KB Output is correct
12 Incorrect 256 ms 66132 KB Output isn't correct
13 Halted 0 ms 0 KB -