#include <bits/stdc++.h>
#include "islands.h"
using namespace std;
typedef pair <vector <int>, vector <int>> pvv;
vector <int> min_rot(vector <int> v) {
rotate(v.begin(), min_element(v.begin(), v.end()), v.end());
return v;
}
variant <bool, vector <int>> find_journey(int N, int M, vector <int> u, vector <int> v) {
queue <int> sinks;
vector <set <int>> in(N), out(N);
for (int i = 0; i < M; i++) {
out[u[i]].insert(i);
in[v[i]].insert(i);
}
auto refresh = [&](int x) {
if (out[x].empty())
sinks.push(x);
};
for (int i = 0; i < N; i++)
refresh(i);
int curr = 0;
vector <int> sofar;
while (1) {
auto remove = [&](int x) {
for (auto it : in[x]) {
out[u[it]].erase(it);
refresh(u[it]);
}
for (auto it : out[x])
in[v[it]].erase(it);
};
for (; !sinks.empty(); sinks.pop()) {
if (sinks.front() == curr)
return false;
remove(sinks.front());
}
if (out[curr].size() == 1) {
int edge = *out[curr].begin();
remove(curr);
curr = v[edge];
sofar.push_back(edge);
}
else {
auto find_cycle = [&](int x, int e, bool b) {
int y = v[e];
vector <bool> bio(N);
vector <int> path = {e};
bio[x] = b;
for (; !bio[y]; y = v[e]) {
path.push_back(e = *out[y].begin());
bio[y] = true;
}
int last = -1;
for (int i = 0; i < path.size(); i++) {
if (x == y)
last = i;
x = v[path[i]];
}
vector <int> tail, cycle;
for (int i = 0; i < path.size(); i++)
(i < last ? tail : cycle).push_back(path[i]);
return pvv(tail, cycle);
};
auto it = out[curr].begin();
pvv cyc1 = find_cycle(curr, *it++, true);
pvv cyc2 = find_cycle(curr, *it++, false);
vector <int> sol;
auto append = [&](vector <int> &v) {
sol.insert(sol.end(), v.begin(), v.end());
reverse(v.begin(), v.end());
};
append(sofar);
bool equal = min_rot(cyc1.second) == min_rot(cyc2.second);
for (int i = 0; i < 2; i++) {
auto traverse = [&](pvv &p1, pvv &p2) {
append(p1.first);
append(p1.second);
if (equal)
reverse(p2.second.begin(), p2.second.end());
append(p1.first);
};
traverse(cyc1, cyc2);
traverse(cyc2, cyc1);
}
append(sofar);
return sol;
}
}
}
Compilation message
islands.cpp: In lambda function:
islands.cpp:58:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
58 | for (int i = 0; i < path.size(); i++) {
| ~~^~~~~~~~~~~~~
islands.cpp:64:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
64 | for (int i = 0; i < path.size(); i++)
| ~~^~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 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 |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
114 ms |
22088 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
0 ms |
212 KB |
Output is correct |
6 |
Correct |
155 ms |
17820 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
724 KB |
Output is correct |
2 |
Correct |
1 ms |
212 KB |
Output is correct |
3 |
Correct |
0 ms |
212 KB |
Output is correct |
4 |
Correct |
0 ms |
212 KB |
Output is correct |
5 |
Correct |
1 ms |
596 KB |
Output is correct |
6 |
Correct |
0 ms |
212 KB |
Output is correct |
7 |
Correct |
1 ms |
468 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
212 KB |
Output is correct |
10 |
Correct |
1 ms |
596 KB |
Output is correct |
11 |
Correct |
0 ms |
212 KB |
Output is correct |
12 |
Correct |
1 ms |
596 KB |
Output is correct |
13 |
Correct |
0 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 |
0 ms |
212 KB |
Output is correct |
17 |
Correct |
84 ms |
11256 KB |
Output is correct |
18 |
Correct |
78 ms |
9168 KB |
Output is correct |
19 |
Correct |
0 ms |
212 KB |
Output is correct |
20 |
Correct |
0 ms |
212 KB |
Output is correct |
21 |
Correct |
0 ms |
212 KB |
Output is correct |
22 |
Correct |
0 ms |
212 KB |
Output is correct |
23 |
Correct |
150 ms |
17800 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
2 ms |
724 KB |
Output is correct |
3 |
Correct |
174 ms |
20028 KB |
Output is correct |
4 |
Correct |
209 ms |
20120 KB |
Output is correct |
5 |
Correct |
2 ms |
724 KB |
Output is correct |
6 |
Correct |
2 ms |
724 KB |
Output is correct |
7 |
Correct |
0 ms |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
0 ms |
212 KB |
Output is correct |
10 |
Correct |
2 ms |
596 KB |
Output is correct |
11 |
Correct |
3 ms |
724 KB |
Output is correct |
12 |
Correct |
2 ms |
724 KB |
Output is correct |
13 |
Correct |
2 ms |
852 KB |
Output is correct |
14 |
Correct |
2 ms |
724 KB |
Output is correct |
15 |
Correct |
3 ms |
1052 KB |
Output is correct |
16 |
Correct |
2 ms |
596 KB |
Output is correct |
17 |
Correct |
1 ms |
212 KB |
Output is correct |
18 |
Correct |
2 ms |
724 KB |
Output is correct |
19 |
Correct |
2 ms |
596 KB |
Output is correct |
20 |
Correct |
212 ms |
22220 KB |
Output is correct |
21 |
Correct |
197 ms |
20056 KB |
Output is correct |
22 |
Correct |
2 ms |
596 KB |
Output is correct |
23 |
Correct |
1 ms |
468 KB |
Output is correct |
24 |
Correct |
1 ms |
212 KB |
Output is correct |
25 |
Correct |
2 ms |
468 KB |
Output is correct |
26 |
Correct |
3 ms |
596 KB |
Output is correct |
27 |
Correct |
204 ms |
21192 KB |
Output is correct |
28 |
Correct |
197 ms |
21176 KB |
Output is correct |
29 |
Correct |
0 ms |
212 KB |
Output is correct |
30 |
Correct |
228 ms |
22304 KB |
Output is correct |
31 |
Correct |
0 ms |
212 KB |
Output is correct |
32 |
Correct |
189 ms |
20132 KB |
Output is correct |
33 |
Correct |
198 ms |
21244 KB |
Output is correct |
34 |
Correct |
76 ms |
11332 KB |
Output is correct |
35 |
Correct |
1 ms |
468 KB |
Output is correct |
36 |
Correct |
159 ms |
17964 KB |
Output is correct |
37 |
Correct |
178 ms |
21220 KB |
Output is correct |
38 |
Correct |
1 ms |
468 KB |
Output is correct |
39 |
Correct |
162 ms |
17228 KB |
Output is correct |
40 |
Correct |
1 ms |
596 KB |
Output is correct |
41 |
Correct |
228 ms |
22216 KB |
Output is correct |
42 |
Correct |
212 ms |
21248 KB |
Output is correct |
43 |
Correct |
0 ms |
212 KB |
Output is correct |
44 |
Correct |
2 ms |
724 KB |
Output is correct |
45 |
Correct |
2 ms |
596 KB |
Output is correct |
46 |
Correct |
47 ms |
9108 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
0 ms |
212 KB |
Output is correct |
3 |
Correct |
0 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 |
1 ms |
212 KB |
Output is correct |
7 |
Correct |
114 ms |
22088 KB |
Output is correct |
8 |
Correct |
0 ms |
212 KB |
Output is correct |
9 |
Correct |
0 ms |
212 KB |
Output is correct |
10 |
Correct |
0 ms |
212 KB |
Output is correct |
11 |
Correct |
0 ms |
212 KB |
Output is correct |
12 |
Correct |
0 ms |
212 KB |
Output is correct |
13 |
Correct |
155 ms |
17820 KB |
Output is correct |
14 |
Correct |
3 ms |
724 KB |
Output is correct |
15 |
Correct |
1 ms |
212 KB |
Output is correct |
16 |
Correct |
0 ms |
212 KB |
Output is correct |
17 |
Correct |
0 ms |
212 KB |
Output is correct |
18 |
Correct |
1 ms |
596 KB |
Output is correct |
19 |
Correct |
0 ms |
212 KB |
Output is correct |
20 |
Correct |
1 ms |
468 KB |
Output is correct |
21 |
Correct |
1 ms |
212 KB |
Output is correct |
22 |
Correct |
1 ms |
212 KB |
Output is correct |
23 |
Correct |
1 ms |
596 KB |
Output is correct |
24 |
Correct |
0 ms |
212 KB |
Output is correct |
25 |
Correct |
1 ms |
596 KB |
Output is correct |
26 |
Correct |
0 ms |
212 KB |
Output is correct |
27 |
Correct |
1 ms |
212 KB |
Output is correct |
28 |
Correct |
1 ms |
212 KB |
Output is correct |
29 |
Correct |
0 ms |
212 KB |
Output is correct |
30 |
Correct |
84 ms |
11256 KB |
Output is correct |
31 |
Correct |
78 ms |
9168 KB |
Output is correct |
32 |
Correct |
0 ms |
212 KB |
Output is correct |
33 |
Correct |
0 ms |
212 KB |
Output is correct |
34 |
Correct |
0 ms |
212 KB |
Output is correct |
35 |
Correct |
0 ms |
212 KB |
Output is correct |
36 |
Correct |
150 ms |
17800 KB |
Output is correct |
37 |
Correct |
0 ms |
212 KB |
Output is correct |
38 |
Correct |
0 ms |
212 KB |
Output is correct |
39 |
Correct |
1 ms |
212 KB |
Output is correct |
40 |
Correct |
2 ms |
340 KB |
Output is correct |
41 |
Correct |
84 ms |
10088 KB |
Output is correct |
42 |
Correct |
3 ms |
944 KB |
Output is correct |
43 |
Correct |
102 ms |
15940 KB |
Output is correct |
44 |
Correct |
103 ms |
15952 KB |
Output is correct |
45 |
Correct |
128 ms |
15932 KB |
Output is correct |
46 |
Correct |
0 ms |
212 KB |
Output is correct |
47 |
Correct |
0 ms |
212 KB |
Output is correct |
48 |
Correct |
0 ms |
212 KB |
Output is correct |
49 |
Correct |
1 ms |
468 KB |
Output is correct |
50 |
Correct |
162 ms |
24788 KB |
Output is correct |
51 |
Correct |
279 ms |
31564 KB |
Output is correct |
52 |
Correct |
296 ms |
31596 KB |
Output is correct |
53 |
Correct |
276 ms |
31560 KB |
Output is correct |
54 |
Correct |
273 ms |
31588 KB |
Output is correct |
55 |
Correct |
262 ms |
31560 KB |
Output is correct |
56 |
Correct |
280 ms |
31632 KB |
Output is correct |
57 |
Correct |
158 ms |
27768 KB |
Output is correct |
58 |
Correct |
138 ms |
22932 KB |
Output is correct |
59 |
Correct |
272 ms |
31692 KB |
Output is correct |
60 |
Correct |
289 ms |
31652 KB |
Output is correct |
61 |
Correct |
270 ms |
31696 KB |
Output is correct |
62 |
Correct |
22 ms |
8088 KB |
Output is correct |
63 |
Correct |
208 ms |
30484 KB |
Output is correct |
64 |
Correct |
120 ms |
11468 KB |
Output is correct |
65 |
Correct |
1 ms |
212 KB |
Output is correct |
66 |
Correct |
1 ms |
340 KB |
Output is correct |
67 |
Correct |
230 ms |
31756 KB |
Output is correct |
68 |
Correct |
328 ms |
22392 KB |
Output is correct |
69 |
Correct |
128 ms |
20808 KB |
Output is correct |
70 |
Correct |
2 ms |
596 KB |
Output is correct |
71 |
Correct |
206 ms |
21472 KB |
Output is correct |
72 |
Correct |
0 ms |
212 KB |
Output is correct |
73 |
Correct |
287 ms |
29036 KB |
Output is correct |
74 |
Correct |
183 ms |
24920 KB |
Output is correct |
75 |
Correct |
6 ms |
1492 KB |
Output is correct |
76 |
Correct |
52 ms |
11832 KB |
Output is correct |
77 |
Correct |
105 ms |
20588 KB |
Output is correct |
78 |
Correct |
299 ms |
31816 KB |
Output is correct |
79 |
Correct |
0 ms |
212 KB |
Output is correct |
80 |
Correct |
327 ms |
33776 KB |
Output is correct |
81 |
Correct |
1 ms |
468 KB |
Output is correct |
82 |
Correct |
212 ms |
22208 KB |
Output is correct |
83 |
Correct |
1 ms |
468 KB |
Output is correct |
84 |
Correct |
0 ms |
212 KB |
Output is correct |
85 |
Correct |
65 ms |
11324 KB |
Output is correct |
86 |
Correct |
2 ms |
724 KB |
Output is correct |
87 |
Correct |
7 ms |
8148 KB |
Output is correct |
88 |
Correct |
3 ms |
980 KB |
Output is correct |
89 |
Correct |
281 ms |
31692 KB |
Output is correct |
90 |
Correct |
302 ms |
31780 KB |
Output is correct |
91 |
Correct |
307 ms |
33344 KB |
Output is correct |
92 |
Correct |
0 ms |
212 KB |
Output is correct |