Submission #396649

# Submission time Handle Problem Language Result Execution time Memory
396649 2021-04-30T14:12:52 Z miss_robot Love Polygon (BOI18_polygon) C++14
100 / 100
391 ms 16932 KB
#include <bits/stdc++.h>

#pragma GCC optimize("O3")

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";
}
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 312 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 316 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 316 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 361 ms 16176 KB Output is correct
5 Correct 344 ms 16124 KB Output is correct
6 Correct 352 ms 16092 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 352 ms 16392 KB Output is correct
2 Correct 360 ms 16376 KB Output is correct
3 Correct 288 ms 16060 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 364 ms 16204 KB Output is correct
6 Correct 373 ms 16548 KB Output is correct
7 Correct 326 ms 16496 KB Output is correct
8 Correct 348 ms 16544 KB Output is correct
9 Correct 321 ms 16796 KB Output is correct
10 Correct 261 ms 16888 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 320 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 312 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 316 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 316 KB Output is correct
15 Correct 1 ms 316 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 361 ms 16176 KB Output is correct
20 Correct 344 ms 16124 KB Output is correct
21 Correct 352 ms 16092 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 352 ms 16392 KB Output is correct
24 Correct 360 ms 16376 KB Output is correct
25 Correct 288 ms 16060 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 364 ms 16204 KB Output is correct
28 Correct 373 ms 16548 KB Output is correct
29 Correct 326 ms 16496 KB Output is correct
30 Correct 348 ms 16544 KB Output is correct
31 Correct 321 ms 16796 KB Output is correct
32 Correct 261 ms 16888 KB Output is correct
33 Correct 1 ms 204 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 1 ms 320 KB Output is correct
37 Correct 391 ms 16220 KB Output is correct
38 Correct 336 ms 16480 KB Output is correct
39 Correct 344 ms 16700 KB Output is correct
40 Correct 380 ms 16508 KB Output is correct
41 Correct 320 ms 16552 KB Output is correct
42 Correct 356 ms 16540 KB Output is correct
43 Correct 332 ms 16656 KB Output is correct
44 Correct 334 ms 16552 KB Output is correct
45 Correct 319 ms 16448 KB Output is correct
46 Correct 314 ms 16548 KB Output is correct
47 Correct 298 ms 16932 KB Output is correct
48 Correct 328 ms 16380 KB Output is correct
49 Correct 343 ms 16284 KB Output is correct
50 Correct 273 ms 16128 KB Output is correct
51 Correct 1 ms 332 KB Output is correct
52 Correct 326 ms 16100 KB Output is correct
53 Correct 303 ms 16472 KB Output is correct
54 Correct 311 ms 16584 KB Output is correct
55 Correct 290 ms 16452 KB Output is correct
56 Correct 297 ms 16928 KB Output is correct
57 Correct 240 ms 16832 KB Output is correct
58 Correct 1 ms 204 KB Output is correct
59 Correct 1 ms 204 KB Output is correct
60 Correct 1 ms 204 KB Output is correct
61 Correct 1 ms 204 KB Output is correct
62 Correct 1 ms 204 KB Output is correct
63 Correct 1 ms 204 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 336 ms 16172 KB Output is correct
66 Correct 319 ms 16036 KB Output is correct
67 Correct 336 ms 16188 KB Output is correct
68 Correct 1 ms 332 KB Output is correct
69 Correct 1 ms 204 KB Output is correct
70 Correct 1 ms 204 KB Output is correct
71 Correct 1 ms 204 KB Output is correct
72 Correct 1 ms 204 KB Output is correct
73 Correct 1 ms 316 KB Output is correct
74 Correct 1 ms 204 KB Output is correct
75 Correct 1 ms 204 KB Output is correct
76 Correct 1 ms 208 KB Output is correct
77 Correct 1 ms 204 KB Output is correct
78 Correct 1 ms 204 KB Output is correct
79 Correct 1 ms 204 KB Output is correct
80 Correct 1 ms 204 KB Output is correct
81 Correct 1 ms 204 KB Output is correct
82 Correct 1 ms 204 KB Output is correct
83 Correct 1 ms 204 KB Output is correct