oj.uz

Submission #915643

# Submission time Handle Problem Language Result Execution time Memory
915643 2024-01-24T12:37:45 Z dsyz Railway (BOI17_railway) C++17
100 / 100
 248 ms 61008 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define MAXN (100005)
ll N,M,K;
vector<pair<ll,ll> > v[MAXN]; //node b, index of edge
vector<ll> ans;
set<pair<ll,ll> > s[MAXN];
ll parent[20][MAXN], depth[MAXN], dist[MAXN];
bool visited[MAXN];
void distdfs(ll x){
	visited[x] = 1;
	for(auto u : v[x]){
		if(visited[u.first] == 0){
			dist[u.first] = dist[x] + 1;
			visited[u.first] = 1;
			distdfs(u.first);
		}
	}
}
void dfs1(ll x,ll nodeparent,ll nodedepth){
	parent[0][x] = nodeparent;
	depth[x] = nodedepth;
	for(ll i = 0;i < v[x].size();i++){
		if(v[x][i].first != nodeparent){
			dfs1(v[x][i].first,x,nodedepth + 1);
		}
	}
}
void lcainit(){
	for(ll i = 1;i < 20;i++){
		for(ll j = 0;j < N;j++){
			parent[i][j] = parent[i - 1][parent[i - 1][j]];
		}
	}
}
ll lca(ll u,ll v){
	if(depth[u] > depth[v]){
		swap(u,v);
	}
	ll diff = depth[v] - depth[u];
	for(ll i = 0;i < 20;i++){
		if(diff & (1<<i)){
			v = parent[i][v];
		} 
	}
	if(u == v){
		return u;
	} 
	for(ll i = 19;i >= 0;i--){
		if(parent[i][u] != parent[i][v]){
			u = parent[i][u];
			v = parent[i][v];
		}
	}
	return parent[0][u];
}
void dfs2(ll x,ll p){
	ll parentedge = -1;
	for(auto u : v[x]){
		if(u.first != p){
			dfs2(u.first,x);
			if(s[u.first].size() > s[x].size()) swap(s[u.first],s[x]); //swap sets is O(1)
			//swapping 2 sets, vectors, maps are O(1) so use these data structures
			//for pbds, it is a bit different syntax: a.swap(b) is O(1)
			s[x].insert(s[u.first].begin(),s[u.first].end());
		}else{
			parentedge = u.second;
		}
	}
	while(!s[x].empty() && s[x].begin()->first == -1 * depth[x]){
		s[x].erase(s[x].begin());
	}
	if(s[x].size() >= K && parentedge != -1){
		ans.push_back(parentedge);
	}
}
int main() {
	ios_base::sync_with_stdio(false);cin.tie(0);
	cin>>N>>M>>K;
	for(ll i = 0;i < N - 1;i++){
		ll a,b;
		cin>>a>>b;
		a--, b--;
		v[a].push_back({b,i});
		v[b].push_back({a,i});
	}
	dist[0] = 0;
	visited[0] = 1;
	distdfs(0);
	dfs1(0,0,0);
	lcainit();
	for(ll i = 0;i < M;i++){
		ll S;
		cin>>S;
		ll LCA = -1;
		ll A[S];
		for(ll j = 0;j < S;j++){
			cin>>A[j];
			A[j]--;
			if(j == 0){
				LCA = A[j];
			}else{
				LCA = lca(LCA,A[j]);
			}
		}
		for(ll j = 0;j < S;j++){
			s[A[j]].insert({-depth[LCA],i});
		}
	}
	dfs2(0,-1);
	sort(ans.begin(),ans.end());
	cout<<ans.size()<<'\n';
	for(auto u : ans){
		cout<<u + 1<<" ";
	}
	cout<<'\n';
}

Compilation message

railway.cpp: In function 'void dfs1(ll, ll, ll)':
railway.cpp:24:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for(ll i = 0;i < v[x].size();i++){
      |               ~~^~~~~~~~~~~~~
railway.cpp: In function 'void dfs2(ll, ll)':
railway.cpp:74:17: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   74 |  if(s[x].size() >= K && parentedge != -1){
      |     ~~~~~~~~~~~~^~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 24412 KB Output is correct
2 Correct 10 ms 25436 KB Output is correct
3 Correct 10 ms 25352 KB Output is correct
4 Correct 5 ms 24412 KB Output is correct
5 Correct 5 ms 24412 KB Output is correct
6 Correct 10 ms 26172 KB Output is correct
7 Correct 10 ms 25436 KB Output is correct
8 Correct 9 ms 25324 KB Output is correct
9 Correct 11 ms 25692 KB Output is correct
10 Correct 6 ms 24408 KB Output is correct
11 Correct 6 ms 24664 KB Output is correct
12 Correct 5 ms 24412 KB Output is correct
13 Correct 6 ms 24412 KB Output is correct
14 Correct 6 ms 24408 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 24412 KB Output is correct
2 Correct 10 ms 25436 KB Output is correct
3 Correct 10 ms 25352 KB Output is correct
4 Correct 5 ms 24412 KB Output is correct
5 Correct 5 ms 24412 KB Output is correct
6 Correct 10 ms 26172 KB Output is correct
7 Correct 10 ms 25436 KB Output is correct
8 Correct 9 ms 25324 KB Output is correct
9 Correct 11 ms 25692 KB Output is correct
10 Correct 6 ms 24408 KB Output is correct
11 Correct 6 ms 24664 KB Output is correct
12 Correct 5 ms 24412 KB Output is correct
13 Correct 6 ms 24412 KB Output is correct
14 Correct 6 ms 24408 KB Output is correct
15 Correct 42 ms 33040 KB Output is correct
16 Correct 42 ms 32936 KB Output is correct
17 Correct 48 ms 33104 KB Output is correct
18 Correct 11 ms 26200 KB Output is correct
19 Correct 12 ms 25436 KB Output is correct
20 Correct 42 ms 32016 KB Output is correct
21 Correct 43 ms 32056 KB Output is correct
22 Correct 6 ms 24412 KB Output is correct
23 Correct 14 ms 25520 KB Output is correct
24 Correct 10 ms 25436 KB Output is correct
25 Correct 5 ms 24624 KB Output is correct
26 Correct 7 ms 24668 KB Output is correct
27 Correct 9 ms 26204 KB Output is correct
28 Correct 10 ms 25400 KB Output is correct
29 Correct 8 ms 25436 KB Output is correct
30 Correct 9 ms 25436 KB Output is correct
31 Correct 6 ms 24668 KB Output is correct
32 Correct 5 ms 24668 KB Output is correct
33 Correct 6 ms 24880 KB Output is correct
34 Correct 6 ms 24412 KB Output is correct
35 Correct 6 ms 24408 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 153 ms 52744 KB Output is correct
2 Correct 6 ms 24408 KB Output is correct
3 Correct 131 ms 52240 KB Output is correct
4 Correct 118 ms 51612 KB Output is correct
5 Correct 128 ms 51464 KB Output is correct
6 Correct 138 ms 54808 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 115 ms 47424 KB Output is correct
2 Correct 133 ms 44460 KB Output is correct
3 Correct 176 ms 52304 KB Output is correct
4 Correct 163 ms 52052 KB Output is correct
5 Correct 191 ms 52428 KB Output is correct
6 Correct 109 ms 47952 KB Output is correct
7 Correct 107 ms 47696 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 115 ms 47424 KB Output is correct
2 Correct 133 ms 44460 KB Output is correct
3 Correct 176 ms 52304 KB Output is correct
4 Correct 163 ms 52052 KB Output is correct
5 Correct 191 ms 52428 KB Output is correct
6 Correct 109 ms 47952 KB Output is correct
7 Correct 107 ms 47696 KB Output is correct
8 Correct 123 ms 46164 KB Output is correct
9 Correct 108 ms 46160 KB Output is correct
10 Correct 114 ms 51308 KB Output is correct
11 Correct 108 ms 51400 KB Output is correct
12 Correct 67 ms 37068 KB Output is correct
13 Correct 72 ms 37124 KB Output is correct
14 Correct 128 ms 45648 KB Output is correct
15 Correct 149 ms 46028 KB Output is correct
16 Correct 162 ms 53576 KB Output is correct
17 Correct 156 ms 54096 KB Output is correct
18 Correct 145 ms 51140 KB Output is correct
19 Correct 126 ms 45368 KB Output is correct
20 Correct 108 ms 48084 KB Output is correct
21 Correct 112 ms 48284 KB Output is correct
22 Correct 106 ms 48096 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 24412 KB Output is correct
2 Correct 10 ms 25436 KB Output is correct
3 Correct 10 ms 25352 KB Output is correct
4 Correct 5 ms 24412 KB Output is correct
5 Correct 5 ms 24412 KB Output is correct
6 Correct 10 ms 26172 KB Output is correct
7 Correct 10 ms 25436 KB Output is correct
8 Correct 9 ms 25324 KB Output is correct
9 Correct 11 ms 25692 KB Output is correct
10 Correct 6 ms 24408 KB Output is correct
11 Correct 6 ms 24664 KB Output is correct
12 Correct 5 ms 24412 KB Output is correct
13 Correct 6 ms 24412 KB Output is correct
14 Correct 6 ms 24408 KB Output is correct
15 Correct 42 ms 33040 KB Output is correct
16 Correct 42 ms 32936 KB Output is correct
17 Correct 48 ms 33104 KB Output is correct
18 Correct 11 ms 26200 KB Output is correct
19 Correct 12 ms 25436 KB Output is correct
20 Correct 42 ms 32016 KB Output is correct
21 Correct 43 ms 32056 KB Output is correct
22 Correct 6 ms 24412 KB Output is correct
23 Correct 14 ms 25520 KB Output is correct
24 Correct 10 ms 25436 KB Output is correct
25 Correct 5 ms 24624 KB Output is correct
26 Correct 7 ms 24668 KB Output is correct
27 Correct 9 ms 26204 KB Output is correct
28 Correct 10 ms 25400 KB Output is correct
29 Correct 8 ms 25436 KB Output is correct
30 Correct 9 ms 25436 KB Output is correct
31 Correct 6 ms 24668 KB Output is correct
32 Correct 5 ms 24668 KB Output is correct
33 Correct 6 ms 24880 KB Output is correct
34 Correct 6 ms 24412 KB Output is correct
35 Correct 6 ms 24408 KB Output is correct
36 Correct 153 ms 52744 KB Output is correct
37 Correct 6 ms 24408 KB Output is correct
38 Correct 131 ms 52240 KB Output is correct
39 Correct 118 ms 51612 KB Output is correct
40 Correct 128 ms 51464 KB Output is correct
41 Correct 138 ms 54808 KB Output is correct
42 Correct 115 ms 47424 KB Output is correct
43 Correct 133 ms 44460 KB Output is correct
44 Correct 176 ms 52304 KB Output is correct
45 Correct 163 ms 52052 KB Output is correct
46 Correct 191 ms 52428 KB Output is correct
47 Correct 109 ms 47952 KB Output is correct
48 Correct 107 ms 47696 KB Output is correct
49 Correct 123 ms 46164 KB Output is correct
50 Correct 108 ms 46160 KB Output is correct
51 Correct 114 ms 51308 KB Output is correct
52 Correct 108 ms 51400 KB Output is correct
53 Correct 67 ms 37068 KB Output is correct
54 Correct 72 ms 37124 KB Output is correct
55 Correct 128 ms 45648 KB Output is correct
56 Correct 149 ms 46028 KB Output is correct
57 Correct 162 ms 53576 KB Output is correct
58 Correct 156 ms 54096 KB Output is correct
59 Correct 145 ms 51140 KB Output is correct
60 Correct 126 ms 45368 KB Output is correct
61 Correct 108 ms 48084 KB Output is correct
62 Correct 112 ms 48284 KB Output is correct
63 Correct 106 ms 48096 KB Output is correct
64 Correct 116 ms 46252 KB Output is correct
65 Correct 248 ms 61008 KB Output is correct
66 Correct 197 ms 55520 KB Output is correct
67 Correct 137 ms 49744 KB Output is correct
68 Correct 66 ms 35104 KB Output is correct
69 Correct 58 ms 35156 KB Output is correct
70 Correct 127 ms 47532 KB Output is correct
71 Correct 106 ms 45924 KB Output is correct
72 Correct 6 ms 24412 KB Output is correct
73 Correct 10 ms 25436 KB Output is correct
74 Correct 9 ms 25392 KB Output is correct
75 Correct 6 ms 24412 KB Output is correct
76 Correct 5 ms 24412 KB Output is correct
77 Correct 9 ms 26204 KB Output is correct
78 Correct 9 ms 25436 KB Output is correct
79 Correct 9 ms 25436 KB Output is correct
80 Correct 9 ms 25436 KB Output is correct
81 Correct 5 ms 24412 KB Output is correct
82 Correct 6 ms 24412 KB Output is correct
83 Correct 5 ms 24412 KB Output is correct
84 Correct 6 ms 24412 KB Output is correct
85 Correct 6 ms 24412 KB Output is correct
86 Correct 44 ms 33132 KB Output is correct
87 Correct 38 ms 33108 KB Output is correct
88 Correct 40 ms 33048 KB Output is correct
89 Correct 11 ms 26200 KB Output is correct
90 Correct 9 ms 25436 KB Output is correct
91 Correct 37 ms 32216 KB Output is correct
92 Correct 41 ms 32080 KB Output is correct
93 Correct 5 ms 24668 KB Output is correct
94 Correct 122 ms 52660 KB Output is correct
95 Correct 142 ms 52280 KB Output is correct
96 Correct 114 ms 51536 KB Output is correct
97 Correct 185 ms 51620 KB Output is correct
98 Correct 168 ms 54744 KB Output is correct
99 Correct 195 ms 57048 KB Output is correct
100 Correct 155 ms 53328 KB Output is correct
101 Correct 172 ms 53696 KB Output is correct
102 Correct 125 ms 44880 KB Output is correct
103 Correct 132 ms 47848 KB Output is correct
104 Correct 114 ms 48176 KB Output is correct
105 Correct 121 ms 47676 KB Output is correct
106 Correct 110 ms 46284 KB Output is correct
107 Correct 124 ms 46292 KB Output is correct
108 Correct 101 ms 51424 KB Output is correct
109 Correct 107 ms 51440 KB Output is correct
110 Correct 69 ms 37180 KB Output is correct
111 Correct 77 ms 37236 KB Output is correct
112 Correct 130 ms 45520 KB Output is correct
113 Correct 125 ms 45452 KB Output is correct