Submission #841571

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
841571	2023-09-01T17:11:52 Z	TheLostCookie	Longest Trip (IOI23_longesttrip)	C++17	100 / 100	10 ms	856 KB

longesttrip

#include "longesttrip.h"
#include <functional>
#include <vector>

std::vector<int> longest_trip(int N, int D) {
	//Invariant: l0.back() and l1.back() are NOT connected.
	std::vector<int> l0,l1;
	
	auto mergeLines = [&l0, &l1]()->void{
		while(!l1.empty()) {
			l0.push_back(l1.back());
			l1.pop_back();
		}
		return;
	};
	
	auto q = [](int u, int v)->bool{
		return are_connected({u},{v});
	};
	
	l0.push_back(0);
	int u=1;
	while(u<N) {
		if(l1.empty()) {
			(q(l0.back(),u)?l0:l1).push_back(u);
			u++;
		} else if(u==N-1) {
			if(!q(l0.back(),u)) l1.push_back(u);
			else {
				l0.push_back(u);
				if(q(l1.back(),u)) {
					mergeLines();
				}
			}
			u++;
		} else {
			int v=u+1;
			bool b0 = q(l0.back(),u), b1 = q(l1.back(),v), b2 = q(u,v);
			if(b0&&b1) {
				l0.push_back(u);
				l1.push_back(v);
				if(b2) mergeLines();
			} else if(!b0&&!b1) {
				l0.push_back(v);
				l1.push_back(u);
				if(b2) mergeLines();
			} else if(b0&&!b1) {
				if(b2) {
					l0.push_back(u);
					l0.push_back(v);
				} else {
					l1.push_back(u);
					l0.push_back(v);
				}
			} else {
				if(b2) {
					l1.push_back(v);
					l1.push_back(u);
				} else {
					l0.push_back(v);
					l1.push_back(u);
				}
			}
			u+=2;
		}
	}
	
	if(l1.empty()) return l0;
	else if(!are_connected(l0,l1)) {
		if(l0.size()>l1.size()) return l0;
		else return l1;
	} else if(l0.size()>1&&(!are_connected({l0.front()},{l0.back()}))) {
		std::reverse(l0.begin(),l0.end());
		mergeLines();
		return l0;
	} else if(l1.size()>1&&(!are_connected({l1.front()},{l1.back()}))) {
		std::reverse(l1.begin(),l1.end());
		mergeLines();
		return l0;
	} else {
		std::vector<int> le(l0), ri(l1);
		for(int rep = 0; rep < 2; rep++) {
			while(le.size()>1) {
				std::vector<int> le0,le1;
				for(int i = 0; i < int(le.size()); i++) {
					(i%2?le0:le1).push_back(le[i]);
				}
				if(are_connected(le0,ri)) std::swap(le,le0);
				else std::swap(le,le1);
			}
			swap(le,ri);
		}
		int lei = 0, rii = 0;
		while(l0[lei] != le[0]) lei++;
		while(l1[rii] != ri[0]) rii++;
		
		std::vector<int> ans;
		for(int i = 0; i < int(l0.size()); i++) {
			ans.push_back(l0[(lei+i+1)%l0.size()]);
		}
		for(int i = 0; i < int(l1.size()); i++) {
			ans.push_back(l1[(rii+i)%l1.size()]);
		}
		return ans;
	}
}

Subtask #0

0.0 / 0.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	2 ms	600 KB	Output is correct

Subtask #1

5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	344 KB	Output is correct
2	Correct	5 ms	344 KB	Output is correct
3	Correct	4 ms	344 KB	Output is correct
4	Correct	4 ms	344 KB	Output is correct
5	Correct	4 ms	344 KB	Output is correct

Subtask #2

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	344 KB	Output is correct
2	Correct	4 ms	344 KB	Output is correct
3	Correct	4 ms	344 KB	Output is correct
4	Correct	4 ms	344 KB	Output is correct
5	Correct	4 ms	600 KB	Output is correct
6	Correct	9 ms	344 KB	Output is correct
7	Correct	6 ms	344 KB	Output is correct
8	Correct	5 ms	344 KB	Output is correct
9	Correct	4 ms	344 KB	Output is correct
10	Correct	4 ms	600 KB	Output is correct
11	Correct	4 ms	344 KB	Output is correct
12	Correct	4 ms	344 KB	Output is correct
13	Correct	5 ms	344 KB	Output is correct

Subtask #3

25.0 / 25.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	344 KB	Output is correct
2	Correct	4 ms	344 KB	Output is correct
3	Correct	4 ms	344 KB	Output is correct
4	Correct	4 ms	344 KB	Output is correct
5	Correct	4 ms	344 KB	Output is correct
6	Correct	8 ms	596 KB	Output is correct
7	Correct	5 ms	344 KB	Output is correct
8	Correct	4 ms	344 KB	Output is correct
9	Correct	4 ms	344 KB	Output is correct
10	Correct	5 ms	344 KB	Output is correct
11	Correct	5 ms	344 KB	Output is correct
12	Correct	4 ms	344 KB	Output is correct
13	Correct	4 ms	600 KB	Output is correct
14	Correct	10 ms	344 KB	Output is correct
15	Correct	7 ms	344 KB	Output is correct
16	Correct	10 ms	344 KB	Output is correct
17	Correct	6 ms	344 KB	Output is correct
18	Correct	5 ms	344 KB	Output is correct
19	Correct	5 ms	600 KB	Output is correct
20	Correct	5 ms	420 KB	Output is correct
21	Correct	5 ms	344 KB	Output is correct
22	Correct	6 ms	344 KB	Output is correct
23	Correct	5 ms	428 KB	Output is correct
24	Correct	5 ms	344 KB	Output is correct
25	Correct	7 ms	344 KB	Output is correct
26	Correct	6 ms	344 KB	Output is correct
27	Correct	5 ms	344 KB	Output is correct
28	Correct	6 ms	344 KB	Output is correct
29	Correct	9 ms	344 KB	Output is correct
30	Correct	6 ms	344 KB	Output is correct
31	Correct	6 ms	344 KB	Output is correct
32	Correct	6 ms	344 KB	Output is correct
33	Correct	5 ms	344 KB	Output is correct
34	Correct	6 ms	344 KB	Output is correct
35	Correct	6 ms	344 KB	Output is correct
36	Correct	9 ms	344 KB	Output is correct
37	Correct	7 ms	600 KB	Output is correct
38	Correct	7 ms	344 KB	Output is correct
39	Correct	7 ms	344 KB	Output is correct
40	Correct	7 ms	344 KB	Output is correct
41	Correct	7 ms	600 KB	Output is correct
42	Correct	8 ms	344 KB	Output is correct
43	Correct	6 ms	344 KB	Output is correct
44	Correct	7 ms	344 KB	Output is correct
45	Correct	7 ms	344 KB	Output is correct
46	Correct	10 ms	344 KB	Output is correct
47	Correct	8 ms	344 KB	Output is correct
48	Correct	6 ms	344 KB	Output is correct
49	Correct	7 ms	344 KB	Output is correct
50	Correct	6 ms	424 KB	Output is correct
51	Correct	7 ms	424 KB	Output is correct
52	Correct	7 ms	356 KB	Output is correct
53	Correct	6 ms	344 KB	Output is correct
54	Correct	6 ms	600 KB	Output is correct
55	Correct	7 ms	344 KB	Output is correct
56	Correct	5 ms	424 KB	Output is correct
57	Correct	7 ms	856 KB	Output is correct
58	Correct	7 ms	600 KB	Output is correct
59	Correct	7 ms	600 KB	Output is correct
60	Correct	7 ms	424 KB	Output is correct
61	Correct	7 ms	344 KB	Output is correct
62	Correct	7 ms	604 KB	Output is correct
63	Correct	7 ms	428 KB	Output is correct
64	Correct	6 ms	428 KB	Output is correct

Subtask #4

60.0 / 60.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	344 KB	Output is correct
2	Correct	5 ms	344 KB	Output is correct
3	Correct	4 ms	344 KB	Output is correct
4	Correct	5 ms	344 KB	Output is correct
5	Correct	4 ms	344 KB	Output is correct
6	Correct	7 ms	344 KB	Output is correct
7	Correct	5 ms	344 KB	Output is correct
8	Correct	4 ms	344 KB	Output is correct
9	Correct	5 ms	344 KB	Output is correct
10	Correct	4 ms	600 KB	Output is correct
11	Correct	4 ms	344 KB	Output is correct
12	Correct	4 ms	600 KB	Output is correct
13	Correct	4 ms	344 KB	Output is correct
14	Correct	8 ms	344 KB	Output is correct
15	Correct	7 ms	344 KB	Output is correct
16	Correct	8 ms	344 KB	Output is correct
17	Correct	7 ms	344 KB	Output is correct
18	Correct	7 ms	344 KB	Output is correct
19	Correct	5 ms	600 KB	Output is correct
20	Correct	5 ms	600 KB	Output is correct
21	Correct	7 ms	344 KB	Output is correct
22	Correct	7 ms	344 KB	Output is correct
23	Correct	8 ms	344 KB	Output is correct
24	Correct	6 ms	344 KB	Output is correct
25	Correct	6 ms	344 KB	Output is correct
26	Correct	5 ms	344 KB	Output is correct
27	Correct	6 ms	344 KB	Output is correct
28	Correct	7 ms	344 KB	Output is correct
29	Correct	5 ms	344 KB	Output is correct
30	Correct	6 ms	344 KB	Output is correct
31	Correct	6 ms	344 KB	Output is correct
32	Correct	7 ms	344 KB	Output is correct
33	Correct	9 ms	344 KB	Output is correct
34	Correct	7 ms	344 KB	Output is correct
35	Correct	10 ms	504 KB	Output is correct
36	Correct	8 ms	344 KB	Output is correct
37	Correct	5 ms	424 KB	Output is correct
38	Correct	7 ms	424 KB	Output is correct
39	Correct	7 ms	344 KB	Output is correct
40	Correct	6 ms	600 KB	Output is correct
41	Correct	7 ms	344 KB	Output is correct
42	Correct	7 ms	344 KB	Output is correct
43	Correct	5 ms	344 KB	Output is correct
44	Correct	5 ms	344 KB	Output is correct
45	Correct	5 ms	428 KB	Output is correct
46	Correct	5 ms	344 KB	Output is correct
47	Correct	5 ms	344 KB	Output is correct
48	Correct	7 ms	344 KB	Output is correct
49	Correct	6 ms	344 KB	Output is correct
50	Correct	7 ms	600 KB	Output is correct
51	Correct	7 ms	344 KB	Output is correct
52	Correct	7 ms	344 KB	Output is correct
53	Correct	6 ms	600 KB	Output is correct
54	Correct	6 ms	344 KB	Output is correct
55	Correct	8 ms	600 KB	Output is correct
56	Correct	8 ms	600 KB	Output is correct
57	Correct	6 ms	344 KB	Output is correct
58	Correct	10 ms	420 KB	Output is correct
59	Correct	8 ms	600 KB	Output is correct
60	Correct	6 ms	344 KB	Output is correct
61	Correct	8 ms	600 KB	Output is correct
62	Correct	5 ms	432 KB	Output is correct
63	Correct	7 ms	600 KB	Output is correct
64	Correct	7 ms	604 KB	Output is correct
65	Correct	6 ms	600 KB	Output is correct
66	Correct	6 ms	600 KB	Output is correct
67	Correct	7 ms	344 KB	Output is correct
68	Correct	8 ms	424 KB	Output is correct
69	Correct	6 ms	604 KB	Output is correct
70	Correct	6 ms	600 KB	Output is correct
71	Correct	6 ms	600 KB	Output is correct
72	Correct	6 ms	600 KB	Output is correct
73	Correct	7 ms	420 KB	Output is correct
74	Correct	7 ms	428 KB	Output is correct
75	Correct	8 ms	504 KB	Output is correct
76	Correct	8 ms	428 KB	Output is correct
77	Correct	6 ms	600 KB	Output is correct
78	Correct	6 ms	600 KB	Output is correct
79	Correct	8 ms	604 KB	Output is correct
80	Correct	7 ms	600 KB	Output is correct
81	Correct	8 ms	424 KB	Output is correct
82	Correct	7 ms	600 KB	Output is correct