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Submission #825340

# Submission time Handle Problem Language Result Execution time Memory
825340 2023-08-14T18:02:44 Z QwertyPi Love Polygon (BOI18_polygon) C++14
100 / 100
 306 ms 43264 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 1e5 + 11;

struct edge{
	int u, v;
};
int p[MAXN];
set<int> G[MAXN];
bool done[MAXN];
template<class T>
using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;

int32_t main(){
	set<string> S; map<string, int> mp;
	int n; cin >> n;
	if(n % 2 == 1){
		cout << -1 << endl;
		return 0;
	}
	vector<pair<string, string>> ES;
	vector<edge> E;
	for(int i = 0; i < n; i++){
		string s, t; cin >> s >> t; S.insert(s); S.insert(t);
		ES.push_back({s, t});
	}
	int id = 0; for(auto i : S) mp[i] = id++;
	for(int i = 0; i < n; i++){
		E.push_back({mp[ES[i].first], mp[ES[i].second]});
	}
	for(int i = 0; i < n; i++) p[E[i].u] = E[i].v;
	int res = 0;
	for(int i = 0; i < n; i++){
		if(p[i] != i && p[p[i]] == i) done[i] = true, res++;
		else if(p[i] != i){
			G[p[i]].insert(i); G[i].insert(p[i]);
		}
	}
	for(int i = 0; i < n; i++){
		vector<int> to_e;
		if(done[i]) G[i].clear();
		for(auto u : G[i]){
			if(done[u]) to_e.push_back(u);
		}
		for(auto u : to_e){
			G[i].erase(u);
		}
	}
	min_priority_queue<pair<int, int>> pq;
	for(int i = 0; i < n; i++){
		if(G[i].size() != 0 && !done[i]) pq.push({G[i].size(), i});
	}
	while(!pq.empty()){
		auto [sz, v] = pq.top(); pq.pop();
		if(sz == 0) continue;
		if(G[v].size() != sz) continue;
		auto u = *G[v].begin();
		for(auto x : G[v]){
			int f, t;
			f = G[x].size();
			G[x].erase(v);
			t = G[x].size();
			if(t < f) pq.push({G[x].size(), x});
		}
		for(auto x : G[u]){
			int f, t;
			f = G[x].size();
			G[x].erase(u);
			t = G[x].size();
			if(t < f) pq.push({G[x].size(), x});
		}
		// cout << "T " << u << ' '  << v << endl;
		G[u].clear(); G[v].clear();
		res++;
	}
	int ans = n - res;
	cout << ans << endl;
}

Compilation message

polygon.cpp: In function 'int32_t main()':
polygon.cpp:55:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   55 |   auto [sz, v] = pq.top(); pq.pop();
      |        ^
polygon.cpp:57:18: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'std::tuple_element<0, std::pair<int, int> >::type' {aka 'int'} [-Wsign-compare]
   57 |   if(G[v].size() != sz) continue;
      |      ~~~~~~~~~~~~^~~~~

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 5004 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5012 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 5012 KB Output is correct
11 Correct 3 ms 5012 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4988 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4884 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 293 ms 41368 KB Output is correct
5 Correct 278 ms 40868 KB Output is correct
6 Correct 294 ms 41504 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 288 ms 39264 KB Output is correct
2 Correct 297 ms 41512 KB Output is correct
3 Correct 193 ms 31176 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 290 ms 41456 KB Output is correct
6 Correct 295 ms 41592 KB Output is correct
7 Correct 277 ms 41380 KB Output is correct
8 Correct 238 ms 36572 KB Output is correct
9 Correct 293 ms 41496 KB Output is correct
10 Correct 222 ms 43196 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 5004 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5012 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 5012 KB Output is correct
11 Correct 3 ms 5012 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 2 ms 4988 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4884 KB Output is correct
17 Correct 3 ms 5076 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 293 ms 41368 KB Output is correct
20 Correct 278 ms 40868 KB Output is correct
21 Correct 294 ms 41504 KB Output is correct
22 Correct 2 ms 4948 KB Output is correct
23 Correct 288 ms 39264 KB Output is correct
24 Correct 297 ms 41512 KB Output is correct
25 Correct 193 ms 31176 KB Output is correct
26 Correct 3 ms 4948 KB Output is correct
27 Correct 290 ms 41456 KB Output is correct
28 Correct 295 ms 41592 KB Output is correct
29 Correct 277 ms 41380 KB Output is correct
30 Correct 238 ms 36572 KB Output is correct
31 Correct 293 ms 41496 KB Output is correct
32 Correct 222 ms 43196 KB Output is correct
33 Correct 2 ms 4948 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 2 ms 4948 KB Output is correct
37 Correct 306 ms 41552 KB Output is correct
38 Correct 281 ms 41560 KB Output is correct
39 Correct 295 ms 41592 KB Output is correct
40 Correct 281 ms 41576 KB Output is correct
41 Correct 280 ms 41608 KB Output is correct
42 Correct 293 ms 41544 KB Output is correct
43 Correct 281 ms 41592 KB Output is correct
44 Correct 296 ms 41580 KB Output is correct
45 Correct 291 ms 41600 KB Output is correct
46 Correct 281 ms 41612 KB Output is correct
47 Correct 280 ms 41636 KB Output is correct
48 Correct 291 ms 41372 KB Output is correct
49 Correct 295 ms 41556 KB Output is correct
50 Correct 194 ms 31180 KB Output is correct
51 Correct 2 ms 4948 KB Output is correct
52 Correct 264 ms 41456 KB Output is correct
53 Correct 296 ms 41728 KB Output is correct
54 Correct 282 ms 41536 KB Output is correct
55 Correct 249 ms 36652 KB Output is correct
56 Correct 281 ms 41488 KB Output is correct
57 Correct 219 ms 43264 KB Output is correct
58 Correct 2 ms 4948 KB Output is correct
59 Correct 2 ms 5004 KB Output is correct
60 Correct 2 ms 4948 KB Output is correct
61 Correct 2 ms 5008 KB Output is correct
62 Correct 2 ms 4948 KB Output is correct
63 Correct 3 ms 4988 KB Output is correct
64 Correct 3 ms 5012 KB Output is correct
65 Correct 270 ms 41400 KB Output is correct
66 Correct 271 ms 40776 KB Output is correct
67 Correct 266 ms 41404 KB Output is correct
68 Correct 2 ms 5020 KB Output is correct
69 Correct 2 ms 4948 KB Output is correct
70 Correct 2 ms 4948 KB Output is correct
71 Correct 2 ms 4948 KB Output is correct
72 Correct 2 ms 4948 KB Output is correct
73 Correct 2 ms 4948 KB Output is correct
74 Correct 3 ms 5012 KB Output is correct
75 Correct 2 ms 5008 KB Output is correct
76 Correct 2 ms 4948 KB Output is correct
77 Correct 3 ms 4952 KB Output is correct
78 Correct 2 ms 5012 KB Output is correct
79 Correct 3 ms 4948 KB Output is correct
80 Correct 2 ms 4948 KB Output is correct
81 Correct 2 ms 4948 KB Output is correct
82 Correct 2 ms 4948 KB Output is correct
83 Correct 2 ms 5008 KB Output is correct