# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
924079 |
2024-02-08T11:41:16 Z |
Perl32 |
Railway (BOI17_railway) |
C++14 |
|
101 ms |
22724 KB |
//I wrote this code 4 u <3
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif
struct HLD {
vector<int> par, siz, head, tin;
vector<vector<int>> g;
int dfs1(int u) {
for (int &to : g[u]) {
if (to == par[u]) {
continue;
}
par[to] = u;
siz[u] += dfs1(to);
if (siz[to] > siz[g[u][0]] || g[u][0] == par[u]) swap(to, g[u][0]);
}
return siz[u];
}
void dfs2(int u, int &timer) {
tin[u] = timer++;
for (int to : g[u]) {
if (to == par[u]) {
continue;
}
head[to] = (timer == tin[u] + 1 ? head[u] : to);
dfs2(to, timer);
}
}
HLD(vector<vector<int>> &g, int r = 0) : par(g.size(), -1), siz(g.size(), 1), head(g.size(), r), tin(g.size()), g(g) {
dfs1(r);
int timer = 0;
dfs2(r, timer);
}
vector<pair<int, int>> path(int a, int b) {
vector<pair<int, int>> res;
for (;; b = par[head[b]]) {
if (tin[b] < tin[a]) swap(a, b);
if (tin[head[b]] <= tin[a]) {
res.emplace_back(tin[a] + 1, tin[b] + 1);
return res;
}
res.emplace_back(tin[head[b]], tin[b] + 1);
}
}
int lca(int a, int b) {
for (;; b = par[head[b]]) {
if (tin[b] < tin[a]) swap(a, b);
if (tin[head[b]] <= tin[a]) return a;
}
}
};
template<typename T>
class Fenwick { //0-indexed, [l, r)
public:
vector<T> t;
int n;
Fenwick() = default;
explicit Fenwick(int n) : t(n + 1), n(n) {}
T get(int x) {
T ans = 0;
for (x; x > 0; x -= x & -x) {
ans += t[x];
}
return ans;
}
T get(int l, int r) {
return get(r) - get(l);
}
void upd(int x, T v) {
for (++x; x <= n; x += x & -x) {
t[x] += v;
}
}
int kth(T k) {
int x = 0;
for (int i = 1 << __lg(n); i > 0; i >>= 1) {
if (x + i <= n && t[x + i] < k) {
k -= t[x += i];
}
}
return x;
}
};
signed main(int32_t argc, char *argv[]) {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n, m, k;
cin >> n >> m >> k;
vector<vector<int>> g(n);
vector<pair<int, int>> e;
for (int i = 1; i < n; ++i) {
int u, v;
cin >> u >> v;
--u, --v;
e.emplace_back(u, v);
g[u].push_back(v);
g[v].push_back(u);
}
HLD tr(g);
vector<int> par(n);
for (int i = 0; i < n - 1; ++i) {
auto [u, v] = e[i];
if (tr.tin[u] > tr.tin[v]) swap(u, v);
par[tr.tin[v]] = i;
}
Fenwick<int> bit(n + 1);
for (int i = 0; i < m; ++i) {
int K;
cin >> K;
vector<int> v(K);
for (int j = 0; j < K; ++j) {
cin >> v[j];
--v[j];
}
int lca = v[0];
for (int j = 1; j < K; ++j) {
lca = tr.lca(lca, v[j]);
}
vector<pair<int, int>> ev;
for (auto x : v) {
for (auto [lx, rx] : tr.path(lca, x)) {
if (lx == rx) continue;
ev.emplace_back(lx, -1);
ev.emplace_back(rx, 1);
}
}
sort(ev.begin(), ev.end());
vector<pair<int, int>> add;
int last = 0, c = 0;
for (auto [x, t] : ev) {
if (t == 1 && c == 1) {
bit.upd(last, 1);
bit.upd(x, -1);
}
c -= t;
if (t == -1 && c == 1) {
last = x;
}
}
}
vector<int> ans;
for (int i = 0; i < n; ++i) {
if (bit.get(i + 1) >= k) {
ans.push_back(par[i]);
}
}
cout << ans.size() << '\n';
sort(ans.begin(), ans.end());
for (auto i : ans) {
cout << i + 1 << ' ';
}
}
/*
*/
Compilation message
railway.cpp: In function 'int main(int32_t, char**)':
railway.cpp:123:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
123 | auto [u, v] = e[i];
| ^
railway.cpp:142:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
142 | for (auto [lx, rx] : tr.path(lca, x)) {
| ^
railway.cpp:151:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
151 | for (auto [x, t] : ev) {
| ^
railway.cpp: In instantiation of 'T Fenwick<T>::get(int) [with T = int]':
railway.cpp:164:26: required from here
railway.cpp:77:14: warning: statement has no effect [-Wunused-value]
77 | for (x; x > 0; x -= x & -x) {
| ^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
4 ms |
1884 KB |
Output is correct |
3 |
Correct |
4 ms |
1884 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
4 ms |
2136 KB |
Output is correct |
7 |
Correct |
4 ms |
2140 KB |
Output is correct |
8 |
Correct |
3 ms |
1884 KB |
Output is correct |
9 |
Correct |
4 ms |
2392 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
456 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
420 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
4 ms |
1884 KB |
Output is correct |
3 |
Correct |
4 ms |
1884 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
4 ms |
2136 KB |
Output is correct |
7 |
Correct |
4 ms |
2140 KB |
Output is correct |
8 |
Correct |
3 ms |
1884 KB |
Output is correct |
9 |
Correct |
4 ms |
2392 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
456 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
420 KB |
Output is correct |
15 |
Correct |
41 ms |
2140 KB |
Output is correct |
16 |
Correct |
43 ms |
2384 KB |
Output is correct |
17 |
Correct |
47 ms |
2292 KB |
Output is correct |
18 |
Correct |
4 ms |
2256 KB |
Output is correct |
19 |
Correct |
4 ms |
1884 KB |
Output is correct |
20 |
Correct |
18 ms |
2396 KB |
Output is correct |
21 |
Correct |
27 ms |
2392 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
5 ms |
1884 KB |
Output is correct |
24 |
Correct |
4 ms |
1884 KB |
Output is correct |
25 |
Correct |
0 ms |
348 KB |
Output is correct |
26 |
Correct |
1 ms |
348 KB |
Output is correct |
27 |
Correct |
4 ms |
2140 KB |
Output is correct |
28 |
Correct |
4 ms |
2140 KB |
Output is correct |
29 |
Correct |
3 ms |
1884 KB |
Output is correct |
30 |
Correct |
3 ms |
1884 KB |
Output is correct |
31 |
Correct |
1 ms |
348 KB |
Output is correct |
32 |
Correct |
0 ms |
348 KB |
Output is correct |
33 |
Correct |
0 ms |
456 KB |
Output is correct |
34 |
Correct |
0 ms |
348 KB |
Output is correct |
35 |
Correct |
0 ms |
348 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
52 ms |
22224 KB |
Output is correct |
2 |
Correct |
0 ms |
600 KB |
Output is correct |
3 |
Correct |
52 ms |
21636 KB |
Output is correct |
4 |
Correct |
48 ms |
20936 KB |
Output is correct |
5 |
Correct |
50 ms |
22212 KB |
Output is correct |
6 |
Correct |
55 ms |
22544 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
57 ms |
18628 KB |
Output is correct |
2 |
Correct |
67 ms |
16544 KB |
Output is correct |
3 |
Correct |
75 ms |
16328 KB |
Output is correct |
4 |
Correct |
84 ms |
16388 KB |
Output is correct |
5 |
Correct |
79 ms |
16328 KB |
Output is correct |
6 |
Correct |
55 ms |
18888 KB |
Output is correct |
7 |
Correct |
54 ms |
18632 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
57 ms |
18628 KB |
Output is correct |
2 |
Correct |
67 ms |
16544 KB |
Output is correct |
3 |
Correct |
75 ms |
16328 KB |
Output is correct |
4 |
Correct |
84 ms |
16388 KB |
Output is correct |
5 |
Correct |
79 ms |
16328 KB |
Output is correct |
6 |
Correct |
55 ms |
18888 KB |
Output is correct |
7 |
Correct |
54 ms |
18632 KB |
Output is correct |
8 |
Correct |
58 ms |
18884 KB |
Output is correct |
9 |
Correct |
57 ms |
18880 KB |
Output is correct |
10 |
Correct |
49 ms |
22216 KB |
Output is correct |
11 |
Correct |
48 ms |
22216 KB |
Output is correct |
12 |
Correct |
61 ms |
16580 KB |
Output is correct |
13 |
Correct |
58 ms |
16796 KB |
Output is correct |
14 |
Correct |
94 ms |
16324 KB |
Output is correct |
15 |
Correct |
94 ms |
16204 KB |
Output is correct |
16 |
Correct |
86 ms |
16448 KB |
Output is correct |
17 |
Correct |
81 ms |
16328 KB |
Output is correct |
18 |
Correct |
84 ms |
16448 KB |
Output is correct |
19 |
Correct |
65 ms |
16676 KB |
Output is correct |
20 |
Correct |
55 ms |
18956 KB |
Output is correct |
21 |
Correct |
56 ms |
19216 KB |
Output is correct |
22 |
Correct |
56 ms |
18888 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
344 KB |
Output is correct |
2 |
Correct |
4 ms |
1884 KB |
Output is correct |
3 |
Correct |
4 ms |
1884 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
4 ms |
2136 KB |
Output is correct |
7 |
Correct |
4 ms |
2140 KB |
Output is correct |
8 |
Correct |
3 ms |
1884 KB |
Output is correct |
9 |
Correct |
4 ms |
2392 KB |
Output is correct |
10 |
Correct |
0 ms |
348 KB |
Output is correct |
11 |
Correct |
0 ms |
456 KB |
Output is correct |
12 |
Correct |
0 ms |
348 KB |
Output is correct |
13 |
Correct |
0 ms |
348 KB |
Output is correct |
14 |
Correct |
0 ms |
420 KB |
Output is correct |
15 |
Correct |
41 ms |
2140 KB |
Output is correct |
16 |
Correct |
43 ms |
2384 KB |
Output is correct |
17 |
Correct |
47 ms |
2292 KB |
Output is correct |
18 |
Correct |
4 ms |
2256 KB |
Output is correct |
19 |
Correct |
4 ms |
1884 KB |
Output is correct |
20 |
Correct |
18 ms |
2396 KB |
Output is correct |
21 |
Correct |
27 ms |
2392 KB |
Output is correct |
22 |
Correct |
0 ms |
348 KB |
Output is correct |
23 |
Correct |
5 ms |
1884 KB |
Output is correct |
24 |
Correct |
4 ms |
1884 KB |
Output is correct |
25 |
Correct |
0 ms |
348 KB |
Output is correct |
26 |
Correct |
1 ms |
348 KB |
Output is correct |
27 |
Correct |
4 ms |
2140 KB |
Output is correct |
28 |
Correct |
4 ms |
2140 KB |
Output is correct |
29 |
Correct |
3 ms |
1884 KB |
Output is correct |
30 |
Correct |
3 ms |
1884 KB |
Output is correct |
31 |
Correct |
1 ms |
348 KB |
Output is correct |
32 |
Correct |
0 ms |
348 KB |
Output is correct |
33 |
Correct |
0 ms |
456 KB |
Output is correct |
34 |
Correct |
0 ms |
348 KB |
Output is correct |
35 |
Correct |
0 ms |
348 KB |
Output is correct |
36 |
Correct |
52 ms |
22224 KB |
Output is correct |
37 |
Correct |
0 ms |
600 KB |
Output is correct |
38 |
Correct |
52 ms |
21636 KB |
Output is correct |
39 |
Correct |
48 ms |
20936 KB |
Output is correct |
40 |
Correct |
50 ms |
22212 KB |
Output is correct |
41 |
Correct |
55 ms |
22544 KB |
Output is correct |
42 |
Correct |
57 ms |
18628 KB |
Output is correct |
43 |
Correct |
67 ms |
16544 KB |
Output is correct |
44 |
Correct |
75 ms |
16328 KB |
Output is correct |
45 |
Correct |
84 ms |
16388 KB |
Output is correct |
46 |
Correct |
79 ms |
16328 KB |
Output is correct |
47 |
Correct |
55 ms |
18888 KB |
Output is correct |
48 |
Correct |
54 ms |
18632 KB |
Output is correct |
49 |
Correct |
58 ms |
18884 KB |
Output is correct |
50 |
Correct |
57 ms |
18880 KB |
Output is correct |
51 |
Correct |
49 ms |
22216 KB |
Output is correct |
52 |
Correct |
48 ms |
22216 KB |
Output is correct |
53 |
Correct |
61 ms |
16580 KB |
Output is correct |
54 |
Correct |
58 ms |
16796 KB |
Output is correct |
55 |
Correct |
94 ms |
16324 KB |
Output is correct |
56 |
Correct |
94 ms |
16204 KB |
Output is correct |
57 |
Correct |
86 ms |
16448 KB |
Output is correct |
58 |
Correct |
81 ms |
16328 KB |
Output is correct |
59 |
Correct |
84 ms |
16448 KB |
Output is correct |
60 |
Correct |
65 ms |
16676 KB |
Output is correct |
61 |
Correct |
55 ms |
18956 KB |
Output is correct |
62 |
Correct |
56 ms |
19216 KB |
Output is correct |
63 |
Correct |
56 ms |
18888 KB |
Output is correct |
64 |
Correct |
59 ms |
18856 KB |
Output is correct |
65 |
Correct |
96 ms |
16324 KB |
Output is correct |
66 |
Correct |
101 ms |
16188 KB |
Output is correct |
67 |
Correct |
96 ms |
16400 KB |
Output is correct |
68 |
Correct |
57 ms |
16628 KB |
Output is correct |
69 |
Correct |
55 ms |
16580 KB |
Output is correct |
70 |
Correct |
62 ms |
19308 KB |
Output is correct |
71 |
Correct |
59 ms |
18632 KB |
Output is correct |
72 |
Correct |
0 ms |
348 KB |
Output is correct |
73 |
Correct |
5 ms |
1880 KB |
Output is correct |
74 |
Correct |
4 ms |
1880 KB |
Output is correct |
75 |
Correct |
0 ms |
344 KB |
Output is correct |
76 |
Correct |
0 ms |
348 KB |
Output is correct |
77 |
Correct |
4 ms |
2140 KB |
Output is correct |
78 |
Correct |
4 ms |
2140 KB |
Output is correct |
79 |
Correct |
3 ms |
1884 KB |
Output is correct |
80 |
Correct |
4 ms |
1884 KB |
Output is correct |
81 |
Correct |
0 ms |
348 KB |
Output is correct |
82 |
Correct |
0 ms |
348 KB |
Output is correct |
83 |
Correct |
0 ms |
348 KB |
Output is correct |
84 |
Correct |
0 ms |
460 KB |
Output is correct |
85 |
Correct |
0 ms |
348 KB |
Output is correct |
86 |
Correct |
42 ms |
2140 KB |
Output is correct |
87 |
Correct |
47 ms |
2372 KB |
Output is correct |
88 |
Correct |
43 ms |
2392 KB |
Output is correct |
89 |
Correct |
4 ms |
2140 KB |
Output is correct |
90 |
Correct |
4 ms |
1884 KB |
Output is correct |
91 |
Correct |
18 ms |
2396 KB |
Output is correct |
92 |
Correct |
33 ms |
2396 KB |
Output is correct |
93 |
Correct |
0 ms |
348 KB |
Output is correct |
94 |
Correct |
53 ms |
22308 KB |
Output is correct |
95 |
Correct |
51 ms |
21700 KB |
Output is correct |
96 |
Correct |
54 ms |
20932 KB |
Output is correct |
97 |
Correct |
52 ms |
22216 KB |
Output is correct |
98 |
Correct |
55 ms |
22724 KB |
Output is correct |
99 |
Correct |
85 ms |
16344 KB |
Output is correct |
100 |
Correct |
84 ms |
16328 KB |
Output is correct |
101 |
Correct |
91 ms |
16600 KB |
Output is correct |
102 |
Correct |
67 ms |
16584 KB |
Output is correct |
103 |
Correct |
54 ms |
18624 KB |
Output is correct |
104 |
Correct |
56 ms |
19144 KB |
Output is correct |
105 |
Correct |
55 ms |
18648 KB |
Output is correct |
106 |
Correct |
65 ms |
18968 KB |
Output is correct |
107 |
Correct |
56 ms |
18628 KB |
Output is correct |
108 |
Correct |
50 ms |
22216 KB |
Output is correct |
109 |
Correct |
48 ms |
22216 KB |
Output is correct |
110 |
Correct |
61 ms |
16584 KB |
Output is correct |
111 |
Correct |
69 ms |
16680 KB |
Output is correct |
112 |
Correct |
99 ms |
16324 KB |
Output is correct |
113 |
Correct |
99 ms |
16200 KB |
Output is correct |