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Submission #789499

# Submission time Handle Problem Language Result Execution time Memory
789499 2023-07-21T12:51:43 Z Trisanu_Das Love Polygon (BOI18_polygon) C++17
100 / 100
 293 ms 16932 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
int main(){
	cin.tie(0); ios::sync_with_stdio(0);
	int n, c = 0, sol = 0;
	cin >> n;
	if(n&1){
		cout << "-1\n";
		exit(0);
	}
	vector<int> love(n), deg(n), s, active(n, 1);
	map<string,int> dns;
	set<int> single;
	for(int i = 0; i < n; i++){
		single.insert(i);
		string a, b;
		cin >> a >> b;
		if(!dns.count(a)) dns[a] = c++;
		if(!dns.count(b)) dns[b] = c++;
		love[dns[a]] = dns[b];
		deg[dns[b]]++;
	}
	for(int i = 0; i < n; i++) if(deg[i] == 0) s.push_back(i);
	int i = 0;
	for(int j = 0; j < n; j++){
		if(active[j] && love[love[j]] == j && love[j] != j){
			active[j] = 0, active[love[j]] = 0;
			single.erase(j), single.erase(love[j]);
			i += 2;
		}
	}
	for(; i < n; i++){
		if(s.empty()) s.push_back(*single.begin());
		int u = s.back();
		s.pop_back();
		active[u] = 0;
		single.erase(u);
		sol++;
		if(active[love[u]]){
			i++;
			active[love[u]] = 0;
			single.erase(love[u]);
			if(active[love[love[u]]] && !--deg[love[love[u]]]) s.push_back(love[love[u]]);
			if(love[love[u]] == u) sol--;
		}
	}
	cout << sol << "\n";
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 324 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 239 ms 16060 KB Output is correct
5 Correct 198 ms 16068 KB Output is correct
6 Correct 293 ms 16128 KB Output is correct
7 Correct 1 ms 340 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 199 ms 16312 KB Output is correct
2 Correct 253 ms 16232 KB Output is correct
3 Correct 200 ms 16204 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 250 ms 16136 KB Output is correct
6 Correct 228 ms 16460 KB Output is correct
7 Correct 200 ms 16444 KB Output is correct
8 Correct 206 ms 16452 KB Output is correct
9 Correct 222 ms 16740 KB Output is correct
10 Correct 164 ms 16932 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 328 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 324 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 320 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 239 ms 16060 KB Output is correct
20 Correct 198 ms 16068 KB Output is correct
21 Correct 293 ms 16128 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 199 ms 16312 KB Output is correct
24 Correct 253 ms 16232 KB Output is correct
25 Correct 200 ms 16204 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 250 ms 16136 KB Output is correct
28 Correct 228 ms 16460 KB Output is correct
29 Correct 200 ms 16444 KB Output is correct
30 Correct 206 ms 16452 KB Output is correct
31 Correct 222 ms 16740 KB Output is correct
32 Correct 164 ms 16932 KB Output is correct
33 Correct 1 ms 212 KB Output is correct
34 Correct 1 ms 328 KB Output is correct
35 Correct 1 ms 212 KB Output is correct
36 Correct 0 ms 212 KB Output is correct
37 Correct 232 ms 16260 KB Output is correct
38 Correct 197 ms 16508 KB Output is correct
39 Correct 208 ms 16528 KB Output is correct
40 Correct 261 ms 16548 KB Output is correct
41 Correct 193 ms 16528 KB Output is correct
42 Correct 214 ms 16588 KB Output is correct
43 Correct 274 ms 16508 KB Output is correct
44 Correct 211 ms 16616 KB Output is correct
45 Correct 247 ms 16548 KB Output is correct
46 Correct 201 ms 16492 KB Output is correct
47 Correct 207 ms 16716 KB Output is correct
48 Correct 243 ms 16472 KB Output is correct
49 Correct 226 ms 16304 KB Output is correct
50 Correct 178 ms 16136 KB Output is correct
51 Correct 1 ms 340 KB Output is correct
52 Correct 227 ms 16104 KB Output is correct
53 Correct 189 ms 16512 KB Output is correct
54 Correct 176 ms 16476 KB Output is correct
55 Correct 208 ms 16520 KB Output is correct
56 Correct 224 ms 16760 KB Output is correct
57 Correct 164 ms 16816 KB Output is correct
58 Correct 1 ms 232 KB Output is correct
59 Correct 1 ms 212 KB Output is correct
60 Correct 1 ms 212 KB Output is correct
61 Correct 1 ms 212 KB Output is correct
62 Correct 1 ms 324 KB Output is correct
63 Correct 1 ms 212 KB Output is correct
64 Correct 1 ms 212 KB Output is correct
65 Correct 234 ms 16172 KB Output is correct
66 Correct 231 ms 16128 KB Output is correct
67 Correct 226 ms 16088 KB Output is correct
68 Correct 0 ms 340 KB Output is correct
69 Correct 1 ms 212 KB Output is correct
70 Correct 1 ms 212 KB Output is correct
71 Correct 1 ms 212 KB Output is correct
72 Correct 1 ms 212 KB Output is correct
73 Correct 1 ms 212 KB Output is correct
74 Correct 1 ms 212 KB Output is correct
75 Correct 1 ms 212 KB Output is correct
76 Correct 1 ms 212 KB Output is correct
77 Correct 1 ms 212 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 1 ms 212 KB Output is correct
80 Correct 0 ms 212 KB Output is correct
81 Correct 1 ms 212 KB Output is correct
82 Correct 1 ms 212 KB Output is correct
83 Correct 1 ms 320 KB Output is correct