답안 #369983

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
369983	2021-02-22T20:36:52 Z	luciocf	Joker (BOI20_joker)	C++14	100 / 100	293 ms	14004 KB

Joker

#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

typedef pair<int, int> pii;

const int maxn = 2e5+10;

struct DSU
{
	int pai[maxn], peso[maxn], edge[maxn];
	bool bp;

	struct RollBack
	{
		int u, v, pu;
		bool b;
	};

	stack<RollBack> stk;

	void init(int n)
	{
		bp = 1;
		for (int i = 0; i < maxn; i++)
			pai[i] = i, peso[i] = 1;
	}

	int Find(int x, int &c)
	{
		if (pai[x] == x) return x;

		c ^= edge[x];

		return Find(pai[x], c);
	}

	bool Join(int x, int y)
	{
		int cx = 0, cy = 0;
		x = Find(x, cx), y = Find(y, cy);

		if (peso[x] < peso[y])
		{
			swap(x, y);
			swap(cx, cy);
		}

		stk.push({x, y, peso[x], bp});

		if (x == y) return bp = (bp && (cx != cy));

		pai[y] = x, peso[x] += peso[y];
		edge[y] = cx ^ cy ^ 1;

		return 1;
	}

	void rollback(int x)
	{
		while (stk.size() > x)
		{
			auto E = stk.top(); stk.pop();

			pai[E.u] = E.u, pai[E.v] = E.v;
			peso[E.u] = E.pu, edge[E.v] = 0;
			bp = E.b;
		}
	}
} dsu;

int n, m;

int opt[maxn];
pii edge[maxn];

void solve(int l, int r)
{
	if (l > r) return;

	int mid = (l+r)>>1, s0 = dsu.stk.size();

	for (int i = l; i <= mid; i++)
		dsu.Join(edge[i].ff, edge[i].ss);

	int s1 = dsu.stk.size();

	if (!dsu.bp) opt[mid] = opt[r+1];
	else
	{
		for (int i = opt[r+1]; i >= max(opt[(l == 0 ? 0 : l-1)], mid+1); i--)
		{
			if (!dsu.Join(edge[i].ff, edge[i].ss))
			{
				opt[mid] = i;
				break;
			}
		}
	}

	dsu.rollback(s1);
	solve(mid+1, r);

	dsu.rollback(s0);
	for (int i = opt[r+1]; i > opt[mid]; i--)
		dsu.Join(edge[i].ff, edge[i].ss);

	solve(l, mid-1);

	dsu.rollback(s0);
}

int main(void)
{
	int q;
	scanf("%d %d %d", &n, &m, &q);

	edge[0] = {0, maxn-1};

	for (int i = 1; i <= m; i++)
		scanf("%d %d", &edge[i].ff, &edge[i].ss);
	
	edge[m+1] = {0, maxn-1};

	dsu.init(n);

	opt[0] = 1, opt[m+1] = m+1;
	solve(0, m);

	while (q--)
	{
		int l, r;
		scanf("%d %d", &l, &r);

		if (opt[l-1] > r) printf("YES\n");
		else printf("NO\n");
	}
}

Compilation message

Joker.cpp: In member function 'void DSU::rollback(int)':
Joker.cpp:64:21: warning: comparison of integer expressions of different signedness: 'std::stack<DSU::RollBack>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   64 |   while (stk.size() > x)
      |          ~~~~~~~~~~~^~~
Joker.cpp: In function 'int main()':
Joker.cpp:119:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  119 |  scanf("%d %d %d", &n, &m, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:124:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  124 |   scanf("%d %d", &edge[i].ff, &edge[i].ss);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:136:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  136 |   scanf("%d %d", &l, &r);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	1 ms	1900 KB	Output is correct
4	Correct	1 ms	1900 KB	Output is correct
5	Correct	1 ms	1900 KB	Output is correct
6	Correct	2 ms	1900 KB	Output is correct
7	Correct	2 ms	1900 KB	Output is correct
8	Correct	2 ms	1900 KB	Output is correct
9	Correct	2 ms	1900 KB	Output is correct
10	Correct	2 ms	1900 KB	Output is correct
11	Correct	2 ms	1900 KB	Output is correct
12	Correct	2 ms	1900 KB	Output is correct
13	Correct	2 ms	1900 KB	Output is correct
14	Correct	2 ms	1900 KB	Output is correct
15	Correct	2 ms	1900 KB	Output is correct
16	Correct	2 ms	1900 KB	Output is correct
17	Correct	2 ms	1900 KB	Output is correct
18	Correct	2 ms	1900 KB	Output is correct
19	Correct	2 ms	1900 KB	Output is correct
20	Correct	2 ms	1900 KB	Output is correct
21	Correct	2 ms	1920 KB	Output is correct
22	Correct	2 ms	1900 KB	Output is correct
23	Correct	2 ms	1900 KB	Output is correct
24	Correct	2 ms	1900 KB	Output is correct
25	Correct	2 ms	1900 KB	Output is correct
26	Correct	2 ms	1900 KB	Output is correct
27	Correct	2 ms	1900 KB	Output is correct
28	Correct	2 ms	1900 KB	Output is correct

Subtask #2
8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	1 ms	1900 KB	Output is correct
4	Correct	1 ms	1900 KB	Output is correct
5	Correct	1 ms	1900 KB	Output is correct
6	Correct	2 ms	1900 KB	Output is correct
7	Correct	2 ms	1900 KB	Output is correct
8	Correct	2 ms	1900 KB	Output is correct
9	Correct	2 ms	1900 KB	Output is correct
10	Correct	2 ms	1900 KB	Output is correct
11	Correct	2 ms	1900 KB	Output is correct
12	Correct	2 ms	1900 KB	Output is correct
13	Correct	2 ms	1900 KB	Output is correct
14	Correct	2 ms	1900 KB	Output is correct
15	Correct	2 ms	1900 KB	Output is correct
16	Correct	2 ms	1900 KB	Output is correct
17	Correct	2 ms	1900 KB	Output is correct
18	Correct	2 ms	1900 KB	Output is correct
19	Correct	2 ms	1900 KB	Output is correct
20	Correct	2 ms	1900 KB	Output is correct
21	Correct	2 ms	1920 KB	Output is correct
22	Correct	2 ms	1900 KB	Output is correct
23	Correct	2 ms	1900 KB	Output is correct
24	Correct	2 ms	1900 KB	Output is correct
25	Correct	2 ms	1900 KB	Output is correct
26	Correct	2 ms	1900 KB	Output is correct
27	Correct	2 ms	1900 KB	Output is correct
28	Correct	2 ms	1900 KB	Output is correct
29	Correct	3 ms	2028 KB	Output is correct
30	Correct	3 ms	2048 KB	Output is correct
31	Correct	3 ms	2028 KB	Output is correct
32	Correct	3 ms	2028 KB	Output is correct
33	Correct	3 ms	2028 KB	Output is correct
34	Correct	4 ms	2028 KB	Output is correct
35	Correct	4 ms	2028 KB	Output is correct
36	Correct	4 ms	2028 KB	Output is correct
37	Correct	4 ms	2028 KB	Output is correct
38	Correct	4 ms	2088 KB	Output is correct
39	Correct	3 ms	2028 KB	Output is correct
40	Correct	3 ms	2028 KB	Output is correct
41	Correct	3 ms	2028 KB	Output is correct
42	Correct	3 ms	2028 KB	Output is correct
43	Correct	3 ms	2028 KB	Output is correct
44	Correct	3 ms	2028 KB	Output is correct
45	Correct	3 ms	2028 KB	Output is correct
46	Correct	3 ms	2028 KB	Output is correct
47	Correct	3 ms	2028 KB	Output is correct
48	Correct	3 ms	2048 KB	Output is correct
49	Correct	3 ms	2028 KB	Output is correct
50	Correct	3 ms	2028 KB	Output is correct
51	Correct	3 ms	2028 KB	Output is correct
52	Correct	3 ms	2028 KB	Output is correct
53	Correct	3 ms	2028 KB	Output is correct
54	Correct	3 ms	2028 KB	Output is correct

Subtask #3
25.0 / 25.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	182 ms	7264 KB	Output is correct
4	Correct	237 ms	10988 KB	Output is correct
5	Correct	152 ms	7644 KB	Output is correct
6	Correct	189 ms	7264 KB	Output is correct
7	Correct	185 ms	7348 KB	Output is correct
8	Correct	223 ms	7284 KB	Output is correct
9	Correct	215 ms	7388 KB	Output is correct
10	Correct	263 ms	7900 KB	Output is correct
11	Correct	201 ms	7260 KB	Output is correct
12	Correct	276 ms	7660 KB	Output is correct
13	Correct	202 ms	6892 KB	Output is correct
14	Correct	206 ms	7232 KB	Output is correct
15	Correct	255 ms	7392 KB	Output is correct
16	Correct	283 ms	7796 KB	Output is correct

Subtask #4
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	1 ms	1900 KB	Output is correct
4	Correct	1 ms	1900 KB	Output is correct
5	Correct	1 ms	1900 KB	Output is correct
6	Correct	2 ms	1900 KB	Output is correct
7	Correct	2 ms	1900 KB	Output is correct
8	Correct	2 ms	1900 KB	Output is correct
9	Correct	2 ms	1900 KB	Output is correct
10	Correct	2 ms	1900 KB	Output is correct
11	Correct	2 ms	1900 KB	Output is correct
12	Correct	2 ms	1900 KB	Output is correct
13	Correct	2 ms	1900 KB	Output is correct
14	Correct	2 ms	1900 KB	Output is correct
15	Correct	2 ms	1900 KB	Output is correct
16	Correct	2 ms	1900 KB	Output is correct
17	Correct	2 ms	1900 KB	Output is correct
18	Correct	2 ms	1900 KB	Output is correct
19	Correct	2 ms	1900 KB	Output is correct
20	Correct	2 ms	1900 KB	Output is correct
21	Correct	2 ms	1920 KB	Output is correct
22	Correct	2 ms	1900 KB	Output is correct
23	Correct	2 ms	1900 KB	Output is correct
24	Correct	2 ms	1900 KB	Output is correct
25	Correct	2 ms	1900 KB	Output is correct
26	Correct	2 ms	1900 KB	Output is correct
27	Correct	2 ms	1900 KB	Output is correct
28	Correct	2 ms	1900 KB	Output is correct
29	Correct	182 ms	7264 KB	Output is correct
30	Correct	237 ms	10988 KB	Output is correct
31	Correct	152 ms	7644 KB	Output is correct
32	Correct	189 ms	7264 KB	Output is correct
33	Correct	185 ms	7348 KB	Output is correct
34	Correct	223 ms	7284 KB	Output is correct
35	Correct	215 ms	7388 KB	Output is correct
36	Correct	263 ms	7900 KB	Output is correct
37	Correct	201 ms	7260 KB	Output is correct
38	Correct	276 ms	7660 KB	Output is correct
39	Correct	202 ms	6892 KB	Output is correct
40	Correct	206 ms	7232 KB	Output is correct
41	Correct	255 ms	7392 KB	Output is correct
42	Correct	283 ms	7796 KB	Output is correct
43	Correct	182 ms	11620 KB	Output is correct
44	Correct	254 ms	13420 KB	Output is correct
45	Correct	248 ms	13380 KB	Output is correct
46	Correct	179 ms	11616 KB	Output is correct
47	Correct	188 ms	11616 KB	Output is correct
48	Correct	243 ms	11228 KB	Output is correct
49	Correct	272 ms	11896 KB	Output is correct
50	Correct	214 ms	11484 KB	Output is correct
51	Correct	239 ms	11868 KB	Output is correct
52	Correct	232 ms	11996 KB	Output is correct
53	Correct	209 ms	11228 KB	Output is correct
54	Correct	233 ms	11484 KB	Output is correct
55	Correct	267 ms	11996 KB	Output is correct
56	Correct	267 ms	11996 KB	Output is correct

Subtask #5
22.0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	1 ms	1900 KB	Output is correct
4	Correct	1 ms	1900 KB	Output is correct
5	Correct	1 ms	1900 KB	Output is correct
6	Correct	2 ms	1900 KB	Output is correct
7	Correct	2 ms	1900 KB	Output is correct
8	Correct	2 ms	1900 KB	Output is correct
9	Correct	2 ms	1900 KB	Output is correct
10	Correct	2 ms	1900 KB	Output is correct
11	Correct	2 ms	1900 KB	Output is correct
12	Correct	2 ms	1900 KB	Output is correct
13	Correct	2 ms	1900 KB	Output is correct
14	Correct	2 ms	1900 KB	Output is correct
15	Correct	2 ms	1900 KB	Output is correct
16	Correct	2 ms	1900 KB	Output is correct
17	Correct	2 ms	1900 KB	Output is correct
18	Correct	2 ms	1900 KB	Output is correct
19	Correct	2 ms	1900 KB	Output is correct
20	Correct	2 ms	1900 KB	Output is correct
21	Correct	2 ms	1920 KB	Output is correct
22	Correct	2 ms	1900 KB	Output is correct
23	Correct	2 ms	1900 KB	Output is correct
24	Correct	2 ms	1900 KB	Output is correct
25	Correct	2 ms	1900 KB	Output is correct
26	Correct	2 ms	1900 KB	Output is correct
27	Correct	2 ms	1900 KB	Output is correct
28	Correct	2 ms	1900 KB	Output is correct
29	Correct	3 ms	2028 KB	Output is correct
30	Correct	3 ms	2048 KB	Output is correct
31	Correct	3 ms	2028 KB	Output is correct
32	Correct	3 ms	2028 KB	Output is correct
33	Correct	3 ms	2028 KB	Output is correct
34	Correct	4 ms	2028 KB	Output is correct
35	Correct	4 ms	2028 KB	Output is correct
36	Correct	4 ms	2028 KB	Output is correct
37	Correct	4 ms	2028 KB	Output is correct
38	Correct	4 ms	2088 KB	Output is correct
39	Correct	3 ms	2028 KB	Output is correct
40	Correct	3 ms	2028 KB	Output is correct
41	Correct	3 ms	2028 KB	Output is correct
42	Correct	3 ms	2028 KB	Output is correct
43	Correct	3 ms	2028 KB	Output is correct
44	Correct	3 ms	2028 KB	Output is correct
45	Correct	3 ms	2028 KB	Output is correct
46	Correct	3 ms	2028 KB	Output is correct
47	Correct	3 ms	2028 KB	Output is correct
48	Correct	3 ms	2048 KB	Output is correct
49	Correct	3 ms	2028 KB	Output is correct
50	Correct	3 ms	2028 KB	Output is correct
51	Correct	3 ms	2028 KB	Output is correct
52	Correct	3 ms	2028 KB	Output is correct
53	Correct	3 ms	2028 KB	Output is correct
54	Correct	3 ms	2028 KB	Output is correct
55	Correct	130 ms	9580 KB	Output is correct
56	Correct	198 ms	13548 KB	Output is correct
57	Correct	108 ms	10164 KB	Output is correct
58	Correct	132 ms	9580 KB	Output is correct
59	Correct	182 ms	9580 KB	Output is correct
60	Correct	241 ms	9964 KB	Output is correct
61	Correct	168 ms	9580 KB	Output is correct
62	Correct	174 ms	10024 KB	Output is correct
63	Correct	152 ms	9196 KB	Output is correct
64	Correct	196 ms	9708 KB	Output is correct
65	Correct	230 ms	10092 KB	Output is correct

Subtask #6
29.0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	1900 KB	Output is correct
2	Correct	1 ms	1900 KB	Output is correct
3	Correct	1 ms	1900 KB	Output is correct
4	Correct	1 ms	1900 KB	Output is correct
5	Correct	1 ms	1900 KB	Output is correct
6	Correct	2 ms	1900 KB	Output is correct
7	Correct	2 ms	1900 KB	Output is correct
8	Correct	2 ms	1900 KB	Output is correct
9	Correct	2 ms	1900 KB	Output is correct
10	Correct	2 ms	1900 KB	Output is correct
11	Correct	2 ms	1900 KB	Output is correct
12	Correct	2 ms	1900 KB	Output is correct
13	Correct	2 ms	1900 KB	Output is correct
14	Correct	2 ms	1900 KB	Output is correct
15	Correct	2 ms	1900 KB	Output is correct
16	Correct	2 ms	1900 KB	Output is correct
17	Correct	2 ms	1900 KB	Output is correct
18	Correct	2 ms	1900 KB	Output is correct
19	Correct	2 ms	1900 KB	Output is correct
20	Correct	2 ms	1900 KB	Output is correct
21	Correct	2 ms	1920 KB	Output is correct
22	Correct	2 ms	1900 KB	Output is correct
23	Correct	2 ms	1900 KB	Output is correct
24	Correct	2 ms	1900 KB	Output is correct
25	Correct	2 ms	1900 KB	Output is correct
26	Correct	2 ms	1900 KB	Output is correct
27	Correct	2 ms	1900 KB	Output is correct
28	Correct	2 ms	1900 KB	Output is correct
29	Correct	3 ms	2028 KB	Output is correct
30	Correct	3 ms	2048 KB	Output is correct
31	Correct	3 ms	2028 KB	Output is correct
32	Correct	3 ms	2028 KB	Output is correct
33	Correct	3 ms	2028 KB	Output is correct
34	Correct	4 ms	2028 KB	Output is correct
35	Correct	4 ms	2028 KB	Output is correct
36	Correct	4 ms	2028 KB	Output is correct
37	Correct	4 ms	2028 KB	Output is correct
38	Correct	4 ms	2088 KB	Output is correct
39	Correct	3 ms	2028 KB	Output is correct
40	Correct	3 ms	2028 KB	Output is correct
41	Correct	3 ms	2028 KB	Output is correct
42	Correct	3 ms	2028 KB	Output is correct
43	Correct	3 ms	2028 KB	Output is correct
44	Correct	3 ms	2028 KB	Output is correct
45	Correct	3 ms	2028 KB	Output is correct
46	Correct	3 ms	2028 KB	Output is correct
47	Correct	3 ms	2028 KB	Output is correct
48	Correct	3 ms	2048 KB	Output is correct
49	Correct	3 ms	2028 KB	Output is correct
50	Correct	3 ms	2028 KB	Output is correct
51	Correct	3 ms	2028 KB	Output is correct
52	Correct	3 ms	2028 KB	Output is correct
53	Correct	3 ms	2028 KB	Output is correct
54	Correct	3 ms	2028 KB	Output is correct
55	Correct	182 ms	7264 KB	Output is correct
56	Correct	237 ms	10988 KB	Output is correct
57	Correct	152 ms	7644 KB	Output is correct
58	Correct	189 ms	7264 KB	Output is correct
59	Correct	185 ms	7348 KB	Output is correct
60	Correct	223 ms	7284 KB	Output is correct
61	Correct	215 ms	7388 KB	Output is correct
62	Correct	263 ms	7900 KB	Output is correct
63	Correct	201 ms	7260 KB	Output is correct
64	Correct	276 ms	7660 KB	Output is correct
65	Correct	202 ms	6892 KB	Output is correct
66	Correct	206 ms	7232 KB	Output is correct
67	Correct	255 ms	7392 KB	Output is correct
68	Correct	283 ms	7796 KB	Output is correct
69	Correct	182 ms	11620 KB	Output is correct
70	Correct	254 ms	13420 KB	Output is correct
71	Correct	248 ms	13380 KB	Output is correct
72	Correct	179 ms	11616 KB	Output is correct
73	Correct	188 ms	11616 KB	Output is correct
74	Correct	243 ms	11228 KB	Output is correct
75	Correct	272 ms	11896 KB	Output is correct
76	Correct	214 ms	11484 KB	Output is correct
77	Correct	239 ms	11868 KB	Output is correct
78	Correct	232 ms	11996 KB	Output is correct
79	Correct	209 ms	11228 KB	Output is correct
80	Correct	233 ms	11484 KB	Output is correct
81	Correct	267 ms	11996 KB	Output is correct
82	Correct	267 ms	11996 KB	Output is correct
83	Correct	130 ms	9580 KB	Output is correct
84	Correct	198 ms	13548 KB	Output is correct
85	Correct	108 ms	10164 KB	Output is correct
86	Correct	132 ms	9580 KB	Output is correct
87	Correct	182 ms	9580 KB	Output is correct
88	Correct	241 ms	9964 KB	Output is correct
89	Correct	168 ms	9580 KB	Output is correct
90	Correct	174 ms	10024 KB	Output is correct
91	Correct	152 ms	9196 KB	Output is correct
92	Correct	196 ms	9708 KB	Output is correct
93	Correct	230 ms	10092 KB	Output is correct
94	Correct	189 ms	12384 KB	Output is correct
95	Correct	227 ms	14004 KB	Output is correct
96	Correct	170 ms	12764 KB	Output is correct
97	Correct	189 ms	12384 KB	Output is correct
98	Correct	198 ms	12256 KB	Output is correct
99	Correct	245 ms	12252 KB	Output is correct
100	Correct	255 ms	12892 KB	Output is correct
101	Correct	209 ms	12124 KB	Output is correct
102	Correct	240 ms	12508 KB	Output is correct
103	Correct	250 ms	12892 KB	Output is correct
104	Correct	221 ms	12124 KB	Output is correct
105	Correct	254 ms	12508 KB	Output is correct
106	Correct	293 ms	12764 KB	Output is correct
107	Correct	140 ms	13124 KB	Output is correct
108	Correct	186 ms	12000 KB	Output is correct
109	Correct	184 ms	12128 KB	Output is correct
110	Correct	186 ms	12128 KB	Output is correct
111	Correct	182 ms	12000 KB	Output is correct
112	Correct	197 ms	12160 KB	Output is correct
113	Correct	184 ms	12128 KB	Output is correct
114	Correct	186 ms	12024 KB	Output is correct
115	Correct	183 ms	12128 KB	Output is correct
116	Correct	184 ms	12196 KB	Output is correct

답안 #369983

Compilation message

Subtask #1 6.0 / 6.0

Subtask #2 8.0 / 8.0

Subtask #3 25.0 / 25.0

Subtask #4 10.0 / 10.0

Subtask #5 22.0 / 22.0

Subtask #6 29.0 / 29.0

Subtask #1
6.0 / 6.0

Subtask #2
8.0 / 8.0

Subtask #3
25.0 / 25.0

Subtask #4
10.0 / 10.0

Subtask #5
22.0 / 22.0

Subtask #6
29.0 / 29.0