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답안 #722663

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
722663 2023-04-12T14:23:12 Z gagik_2007 Joker (BOI20_joker) C++17
39 / 100
 976 ms 177676 KB 
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cmath>
#include <chrono>
#include <ctime>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <limits>
#include <iomanip>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <functional>
#include <random>
#include <cassert>
using namespace std;

typedef long long ll;
typedef long double ld;

#define ff first
#define ss second

struct Query {
	int l;
	int r;
	int ind;
	ll ans;
	Query(int _l, int _r, int _ind) :l(_l), r(_r), ind(_ind), ans(0) {}
};

struct Edge {
	int x;
	int y;
	Edge(int _x, int _y) :x(_x), y(_y) {}
};

ll ttt;
const ll INF = 1e18;
const ll MOD = 1e9 + 7;
const ll N = 200007;
const ll LG = 31;
ll n, m, k;
set<int>g[N];
deque<int>gd[N];
vector<Query>q;
vector<Edge>e;
int used[N];

// functions using set

bool dfs(int v) {
	for (int to : g[v]) {
		if (used[to] == used[v]) {
			return true;
		}
		else if (!used[to]) {
			used[to] = 3 - used[v];
			if (dfs(to)) {
				return true;
			}
		}
	}
	return false;
}

bool is_odd_cycle() {
	for (int i = 1; i <= n; i++) {
		used[i] = 0;
	}
	for (int i = 1; i <= n; i++) {
		if (!used[i]) {
			used[i] = 1;
			if (dfs(i)) {
				return true;
			}
		}
	}
	return false;
}

void remove_edges(const Query& query) {
	for (int i = query.l; i <= query.r; i++) {
		g[e[i].x].erase(e[i].y);
		g[e[i].y].erase(e[i].x);
	}
}

void add_edges(const Query& query) {
	for (int i = query.l; i <= query.r; i++) {
		g[e[i].x].insert(e[i].y);
		g[e[i].y].insert(e[i].x);
	}
}

bool do_query(const Query& query) {
	remove_edges(query);
	bool res = is_odd_cycle();
	add_edges(query);
	return res;
}


// functions using deque

bool dfs_d(int v) {
	for (int to : gd[v]) {
		if (used[to] == used[v]) {
			return true;
		}
		else if (!used[to]) {
			used[to] = 3 - used[v];
			if (dfs_d(to)) {
				return true;
			}
		}
	}
	return false;
}

bool is_odd_cycle_d() {
	for (int i = 1; i <= n; i++) {
		used[i] = 0;
	}
	for (int i = 1; i <= n; i++) {
		if (!used[i]) {
			used[i] = 1;
			if (dfs_d(i)) {
				return true;
			}
		}
	}
	return false;
}

void remove_edges_d(const Query& query) {
	for (int i = query.l; i <= query.r; i++) {
		gd[e[i].x].pop_front();
		gd[e[i].y].pop_front();
	}
}

void add_edges_d(const Query& query) {
	for (int i = query.r; i >= query.l; i--) {
		gd[e[i].x].push_front(e[i].y);
		gd[e[i].y].push_front(e[i].x);
	}
}

bool do_query_d(const Query& query) {
	remove_edges_d(query);
	bool res = is_odd_cycle_d();
	add_edges_d(query);
	return res;
}

void only_l_equals_one() {
	// finding the first number i for which do_query(Query(0, i)) == false
	int l = 0, r = m + 1;
	while (l < r) {
		int mid = (l + r) / 2;
		if (do_query_d(Query(0, mid, 0))) {
			l = mid + 1;
		}
		else {
			r = mid;
		}
	}
	for (int i = 0; i < k; i++) {
		if (q[i].r >= l) {
			cout << "NO\n";
		}
		else cout << "YES\n";
	}
}

int main() {
	//freopen("in.txt", "r", stdin);
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> m >> k;
	for (int i = 0; i < m; i++) {
		int x, y;
		cin >> x >> y;
		g[x].insert(y);
		g[y].insert(x);
		gd[x].push_back(y);
		gd[y].push_back(x);
		e.push_back(Edge(x, y));
	}
	bool only1 = true;
	for (int i = 0; i < k; i++) {
		int l, r;
		cin >> l >> r;
		l--, r--;
		if (l != 0)only1 = false;
		q.push_back(Query(l, r, i));
	}
	if (n <= 2000 && m <= 2000 && k <= 2000) {
		for (int i = 0; i < k; i++) {
			if (do_query(q[i])) {
				cout << "YES\n";
			}
			else {
				cout << "NO\n";
			}
		}
	}
	else if (only1) {
		only_l_equals_one();
	}
}

/// ---- - --------  ------ -------- -- - - -
/// Just a reminder. Ubuntu password is I O I
/// ---- - --------  ------ -------- -- - - -

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 83 ms 144348 KB Output is correct
4 Correct 93 ms 144308 KB Output is correct
5 Correct 88 ms 144264 KB Output is correct
6 Correct 87 ms 144364 KB Output is correct
7 Correct 88 ms 144292 KB Output is correct
8 Correct 97 ms 144264 KB Output is correct
9 Correct 89 ms 144272 KB Output is correct
10 Correct 88 ms 144432 KB Output is correct
11 Correct 92 ms 144388 KB Output is correct
12 Correct 87 ms 144288 KB Output is correct
13 Correct 89 ms 144380 KB Output is correct
14 Correct 86 ms 144364 KB Output is correct
15 Correct 105 ms 144276 KB Output is correct
16 Correct 105 ms 144364 KB Output is correct
17 Correct 105 ms 144276 KB Output is correct
18 Correct 99 ms 144268 KB Output is correct
19 Correct 101 ms 144380 KB Output is correct
20 Correct 93 ms 144372 KB Output is correct
21 Correct 93 ms 144348 KB Output is correct
22 Correct 86 ms 144264 KB Output is correct
23 Correct 94 ms 144308 KB Output is correct
24 Correct 85 ms 144372 KB Output is correct
25 Correct 99 ms 144372 KB Output is correct
26 Correct 91 ms 144492 KB Output is correct
27 Correct 87 ms 144340 KB Output is correct
28 Correct 92 ms 144332 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 83 ms 144348 KB Output is correct
4 Correct 93 ms 144308 KB Output is correct
5 Correct 88 ms 144264 KB Output is correct
6 Correct 87 ms 144364 KB Output is correct
7 Correct 88 ms 144292 KB Output is correct
8 Correct 97 ms 144264 KB Output is correct
9 Correct 89 ms 144272 KB Output is correct
10 Correct 88 ms 144432 KB Output is correct
11 Correct 92 ms 144388 KB Output is correct
12 Correct 87 ms 144288 KB Output is correct
13 Correct 89 ms 144380 KB Output is correct
14 Correct 86 ms 144364 KB Output is correct
15 Correct 105 ms 144276 KB Output is correct
16 Correct 105 ms 144364 KB Output is correct
17 Correct 105 ms 144276 KB Output is correct
18 Correct 99 ms 144268 KB Output is correct
19 Correct 101 ms 144380 KB Output is correct
20 Correct 93 ms 144372 KB Output is correct
21 Correct 93 ms 144348 KB Output is correct
22 Correct 86 ms 144264 KB Output is correct
23 Correct 94 ms 144308 KB Output is correct
24 Correct 85 ms 144372 KB Output is correct
25 Correct 99 ms 144372 KB Output is correct
26 Correct 91 ms 144492 KB Output is correct
27 Correct 87 ms 144340 KB Output is correct
28 Correct 92 ms 144332 KB Output is correct
29 Correct 179 ms 144684 KB Output is correct
30 Correct 378 ms 144756 KB Output is correct
31 Correct 468 ms 144784 KB Output is correct
32 Correct 503 ms 144784 KB Output is correct
33 Correct 561 ms 144652 KB Output is correct
34 Correct 445 ms 144664 KB Output is correct
35 Correct 450 ms 144660 KB Output is correct
36 Correct 431 ms 144696 KB Output is correct
37 Correct 304 ms 144684 KB Output is correct
38 Correct 250 ms 144668 KB Output is correct
39 Correct 437 ms 144656 KB Output is correct
40 Correct 475 ms 144776 KB Output is correct
41 Correct 461 ms 144672 KB Output is correct
42 Correct 508 ms 144712 KB Output is correct
43 Correct 204 ms 144716 KB Output is correct
44 Correct 176 ms 144612 KB Output is correct
45 Correct 169 ms 144668 KB Output is correct
46 Correct 152 ms 144768 KB Output is correct
47 Correct 516 ms 144712 KB Output is correct
48 Correct 477 ms 144780 KB Output is correct
49 Correct 479 ms 144588 KB Output is correct
50 Correct 449 ms 144684 KB Output is correct
51 Correct 543 ms 144788 KB Output is correct
52 Correct 496 ms 144664 KB Output is correct
53 Correct 480 ms 144576 KB Output is correct
54 Correct 398 ms 144664 KB Output is correct

Subtask #3
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 805 ms 176132 KB Output is correct
4 Correct 976 ms 174328 KB Output is correct
5 Correct 712 ms 172536 KB Output is correct
6 Correct 691 ms 172892 KB Output is correct
7 Correct 619 ms 172308 KB Output is correct
8 Correct 594 ms 173980 KB Output is correct
9 Correct 683 ms 177096 KB Output is correct
10 Correct 918 ms 176040 KB Output is correct
11 Correct 571 ms 176208 KB Output is correct
12 Correct 720 ms 176428 KB Output is correct
13 Correct 502 ms 176588 KB Output is correct
14 Correct 579 ms 177676 KB Output is correct
15 Correct 773 ms 176912 KB Output is correct
16 Correct 905 ms 176424 KB Output is correct

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 83 ms 144348 KB Output is correct
4 Correct 93 ms 144308 KB Output is correct
5 Correct 88 ms 144264 KB Output is correct
6 Correct 87 ms 144364 KB Output is correct
7 Correct 88 ms 144292 KB Output is correct
8 Correct 97 ms 144264 KB Output is correct
9 Correct 89 ms 144272 KB Output is correct
10 Correct 88 ms 144432 KB Output is correct
11 Correct 92 ms 144388 KB Output is correct
12 Correct 87 ms 144288 KB Output is correct
13 Correct 89 ms 144380 KB Output is correct
14 Correct 86 ms 144364 KB Output is correct
15 Correct 105 ms 144276 KB Output is correct
16 Correct 105 ms 144364 KB Output is correct
17 Correct 105 ms 144276 KB Output is correct
18 Correct 99 ms 144268 KB Output is correct
19 Correct 101 ms 144380 KB Output is correct
20 Correct 93 ms 144372 KB Output is correct
21 Correct 93 ms 144348 KB Output is correct
22 Correct 86 ms 144264 KB Output is correct
23 Correct 94 ms 144308 KB Output is correct
24 Correct 85 ms 144372 KB Output is correct
25 Correct 99 ms 144372 KB Output is correct
26 Correct 91 ms 144492 KB Output is correct
27 Correct 87 ms 144340 KB Output is correct
28 Correct 92 ms 144332 KB Output is correct
29 Correct 805 ms 176132 KB Output is correct
30 Correct 976 ms 174328 KB Output is correct
31 Correct 712 ms 172536 KB Output is correct
32 Correct 691 ms 172892 KB Output is correct
33 Correct 619 ms 172308 KB Output is correct
34 Correct 594 ms 173980 KB Output is correct
35 Correct 683 ms 177096 KB Output is correct
36 Correct 918 ms 176040 KB Output is correct
37 Correct 571 ms 176208 KB Output is correct
38 Correct 720 ms 176428 KB Output is correct
39 Correct 502 ms 176588 KB Output is correct
40 Correct 579 ms 177676 KB Output is correct
41 Correct 773 ms 176912 KB Output is correct
42 Correct 905 ms 176424 KB Output is correct
43 Incorrect 279 ms 176196 KB Output isn't correct
44 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 83 ms 144348 KB Output is correct
4 Correct 93 ms 144308 KB Output is correct
5 Correct 88 ms 144264 KB Output is correct
6 Correct 87 ms 144364 KB Output is correct
7 Correct 88 ms 144292 KB Output is correct
8 Correct 97 ms 144264 KB Output is correct
9 Correct 89 ms 144272 KB Output is correct
10 Correct 88 ms 144432 KB Output is correct
11 Correct 92 ms 144388 KB Output is correct
12 Correct 87 ms 144288 KB Output is correct
13 Correct 89 ms 144380 KB Output is correct
14 Correct 86 ms 144364 KB Output is correct
15 Correct 105 ms 144276 KB Output is correct
16 Correct 105 ms 144364 KB Output is correct
17 Correct 105 ms 144276 KB Output is correct
18 Correct 99 ms 144268 KB Output is correct
19 Correct 101 ms 144380 KB Output is correct
20 Correct 93 ms 144372 KB Output is correct
21 Correct 93 ms 144348 KB Output is correct
22 Correct 86 ms 144264 KB Output is correct
23 Correct 94 ms 144308 KB Output is correct
24 Correct 85 ms 144372 KB Output is correct
25 Correct 99 ms 144372 KB Output is correct
26 Correct 91 ms 144492 KB Output is correct
27 Correct 87 ms 144340 KB Output is correct
28 Correct 92 ms 144332 KB Output is correct
29 Correct 179 ms 144684 KB Output is correct
30 Correct 378 ms 144756 KB Output is correct
31 Correct 468 ms 144784 KB Output is correct
32 Correct 503 ms 144784 KB Output is correct
33 Correct 561 ms 144652 KB Output is correct
34 Correct 445 ms 144664 KB Output is correct
35 Correct 450 ms 144660 KB Output is correct
36 Correct 431 ms 144696 KB Output is correct
37 Correct 304 ms 144684 KB Output is correct
38 Correct 250 ms 144668 KB Output is correct
39 Correct 437 ms 144656 KB Output is correct
40 Correct 475 ms 144776 KB Output is correct
41 Correct 461 ms 144672 KB Output is correct
42 Correct 508 ms 144712 KB Output is correct
43 Correct 204 ms 144716 KB Output is correct
44 Correct 176 ms 144612 KB Output is correct
45 Correct 169 ms 144668 KB Output is correct
46 Correct 152 ms 144768 KB Output is correct
47 Correct 516 ms 144712 KB Output is correct
48 Correct 477 ms 144780 KB Output is correct
49 Correct 479 ms 144588 KB Output is correct
50 Correct 449 ms 144684 KB Output is correct
51 Correct 543 ms 144788 KB Output is correct
52 Correct 496 ms 144664 KB Output is correct
53 Correct 480 ms 144576 KB Output is correct
54 Correct 398 ms 144664 KB Output is correct
55 Incorrect 247 ms 164692 KB Output isn't correct
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 144248 KB Output is correct
2 Correct 86 ms 144344 KB Output is correct
3 Correct 83 ms 144348 KB Output is correct
4 Correct 93 ms 144308 KB Output is correct
5 Correct 88 ms 144264 KB Output is correct
6 Correct 87 ms 144364 KB Output is correct
7 Correct 88 ms 144292 KB Output is correct
8 Correct 97 ms 144264 KB Output is correct
9 Correct 89 ms 144272 KB Output is correct
10 Correct 88 ms 144432 KB Output is correct
11 Correct 92 ms 144388 KB Output is correct
12 Correct 87 ms 144288 KB Output is correct
13 Correct 89 ms 144380 KB Output is correct
14 Correct 86 ms 144364 KB Output is correct
15 Correct 105 ms 144276 KB Output is correct
16 Correct 105 ms 144364 KB Output is correct
17 Correct 105 ms 144276 KB Output is correct
18 Correct 99 ms 144268 KB Output is correct
19 Correct 101 ms 144380 KB Output is correct
20 Correct 93 ms 144372 KB Output is correct
21 Correct 93 ms 144348 KB Output is correct
22 Correct 86 ms 144264 KB Output is correct
23 Correct 94 ms 144308 KB Output is correct
24 Correct 85 ms 144372 KB Output is correct
25 Correct 99 ms 144372 KB Output is correct
26 Correct 91 ms 144492 KB Output is correct
27 Correct 87 ms 144340 KB Output is correct
28 Correct 92 ms 144332 KB Output is correct
29 Correct 179 ms 144684 KB Output is correct
30 Correct 378 ms 144756 KB Output is correct
31 Correct 468 ms 144784 KB Output is correct
32 Correct 503 ms 144784 KB Output is correct
33 Correct 561 ms 144652 KB Output is correct
34 Correct 445 ms 144664 KB Output is correct
35 Correct 450 ms 144660 KB Output is correct
36 Correct 431 ms 144696 KB Output is correct
37 Correct 304 ms 144684 KB Output is correct
38 Correct 250 ms 144668 KB Output is correct
39 Correct 437 ms 144656 KB Output is correct
40 Correct 475 ms 144776 KB Output is correct
41 Correct 461 ms 144672 KB Output is correct
42 Correct 508 ms 144712 KB Output is correct
43 Correct 204 ms 144716 KB Output is correct
44 Correct 176 ms 144612 KB Output is correct
45 Correct 169 ms 144668 KB Output is correct
46 Correct 152 ms 144768 KB Output is correct
47 Correct 516 ms 144712 KB Output is correct
48 Correct 477 ms 144780 KB Output is correct
49 Correct 479 ms 144588 KB Output is correct
50 Correct 449 ms 144684 KB Output is correct
51 Correct 543 ms 144788 KB Output is correct
52 Correct 496 ms 144664 KB Output is correct
53 Correct 480 ms 144576 KB Output is correct
54 Correct 398 ms 144664 KB Output is correct
55 Correct 805 ms 176132 KB Output is correct
56 Correct 976 ms 174328 KB Output is correct
57 Correct 712 ms 172536 KB Output is correct
58 Correct 691 ms 172892 KB Output is correct
59 Correct 619 ms 172308 KB Output is correct
60 Correct 594 ms 173980 KB Output is correct
61 Correct 683 ms 177096 KB Output is correct
62 Correct 918 ms 176040 KB Output is correct
63 Correct 571 ms 176208 KB Output is correct
64 Correct 720 ms 176428 KB Output is correct
65 Correct 502 ms 176588 KB Output is correct
66 Correct 579 ms 177676 KB Output is correct
67 Correct 773 ms 176912 KB Output is correct
68 Correct 905 ms 176424 KB Output is correct
69 Incorrect 279 ms 176196 KB Output isn't correct
70 Halted 0 ms 0 KB -