Line | Branch | Decision | Exec | Source |
---|---|---|---|---|
1 | // Copyright 2019-2022 Cambridge Quantum Computing | |||
2 | // | |||
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |||
4 | // you may not use this file except in compliance with the License. | |||
5 | // You may obtain a copy of the License at | |||
6 | // | |||
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |||
8 | // | |||
9 | // Unless required by applicable law or agreed to in writing, software | |||
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |||
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||
12 | // See the License for the specific language governing permissions and | |||
13 | // limitations under the License. | |||
14 | ||||
15 | #include "GraphRoutines.hpp" | |||
16 | ||||
17 | #include <stack> | |||
18 | ||||
19 | #include "AdjacencyData.hpp" | |||
20 | ||||
21 | using std::map; | |||
22 | using std::set; | |||
23 | using std::size_t; | |||
24 | using std::vector; | |||
25 | ||||
26 | namespace tket { | |||
27 | namespace graphs { | |||
28 | ||||
29 | 17163 | vector<set<size_t>> GraphRoutines::get_connected_components( | ||
30 | const AdjacencyData& adjacency_data) { | |||
31 | 17163 | set<size_t> vertices_seen; | ||
32 | 17163 | vector<set<size_t>> result; | ||
33 |
1/2✓ Branch 1 taken 17163 times.
✗ Branch 2 not taken.
|
17163 | const size_t number_of_vertices = adjacency_data.get_number_of_vertices(); | |
34 | ||||
35 |
2/2✓ Branch 0 taken 498031 times.
✓ Branch 1 taken 17163 times.
|
2/2✓ Decision 'true' taken 498031 times.
✓ Decision 'false' taken 17163 times.
|
515194 | for (size_t v = 0; v < number_of_vertices; ++v) { |
36 |
3/4✓ Branch 1 taken 498031 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 192604 times.
✓ Branch 4 taken 305427 times.
|
2/2✓ Decision 'true' taken 192604 times.
✓ Decision 'false' taken 305427 times.
|
498031 | if (vertices_seen.count(v) != 0) { |
37 | 192604 | continue; | ||
38 | } | |||
39 | 305427 | set<size_t> vertices_seen_in_this_component; | ||
40 |
1/2✓ Branch 1 taken 305427 times.
✗ Branch 2 not taken.
|
305427 | vertices_seen_in_this_component.insert(v); | |
41 | ||||
42 |
1/2✓ Branch 1 taken 305427 times.
✗ Branch 2 not taken.
|
305427 | std::stack<size_t> vertices_to_examine_next; | |
43 |
1/2✓ Branch 1 taken 305427 times.
✗ Branch 2 not taken.
|
305427 | vertices_to_examine_next.push(v); | |
44 | ||||
45 |
2/2✓ Branch 1 taken 498031 times.
✓ Branch 2 taken 305427 times.
|
2/2✓ Decision 'true' taken 498031 times.
✓ Decision 'false' taken 305427 times.
|
803458 | while (!vertices_to_examine_next.empty()) { |
46 | 498031 | const size_t this_vertex = vertices_to_examine_next.top(); | ||
47 | 498031 | vertices_to_examine_next.pop(); | ||
48 | const auto& neighbouring_vertices = | |||
49 |
1/2✓ Branch 1 taken 498031 times.
✗ Branch 2 not taken.
|
498031 | adjacency_data.get_neighbours(this_vertex); | |
50 | ||||
51 |
2/2✓ Branch 5 taken 777594 times.
✓ Branch 6 taken 498031 times.
|
2/2✓ Decision 'true' taken 777594 times.
✓ Decision 'false' taken 498031 times.
|
1275625 | for (size_t j : neighbouring_vertices) { |
52 |
3/4✓ Branch 1 taken 777594 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 192604 times.
✓ Branch 4 taken 584990 times.
|
2/2✓ Decision 'true' taken 192604 times.
✓ Decision 'false' taken 584990 times.
|
777594 | if (vertices_seen_in_this_component.count(j) == 0) { |
53 |
1/2✓ Branch 1 taken 192604 times.
✗ Branch 2 not taken.
|
192604 | vertices_to_examine_next.push(j); | |
54 |
1/2✓ Branch 1 taken 192604 times.
✗ Branch 2 not taken.
|
192604 | vertices_seen_in_this_component.insert(j); | |
55 | } | |||
56 | } | |||
57 | } | |||
58 | // Now, push back the vertices seen. | |||
59 |
1/2✓ Branch 1 taken 305427 times.
✗ Branch 2 not taken.
|
305427 | result.emplace_back(vertices_seen_in_this_component); | |
60 |
2/2✓ Branch 5 taken 498031 times.
✓ Branch 6 taken 305427 times.
|
2/2✓ Decision 'true' taken 498031 times.
✓ Decision 'false' taken 305427 times.
|
803458 | for (size_t k : vertices_seen_in_this_component) { |
61 |
1/2✓ Branch 1 taken 498031 times.
✗ Branch 2 not taken.
|
498031 | vertices_seen.insert(k); | |
62 | } | |||
63 | 305427 | } | ||
64 | 34326 | return result; | ||
65 | 17163 | } | ||
66 | ||||
67 | } // namespace graphs | |||
68 | } // namespace tket | |||
69 |