#include <bits/stdc++.h>
using namespace std;
#define sp " "
#define endl "\n"
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define N 200005
#define LOGN 30
vector<array<int, 3>> adj[N];
int dist[N], vis[N], mark[N], val[N], base[N];
void dfs(int node, int root, int d){
dist[node] = d;
vis[node] = 1;
for (auto i : adj[node]){
int curr = i[0], w = i[1], ind = i[2];
if (curr == root) continue;
if (vis[curr]){
mark[ind] = 1;
val[ind] = w ^ dist[curr] ^ dist[node];
}
else{
dfs(curr, node, d ^ w);
}
}
}
int32_t main(){
#ifndef ONLINE_JUDGE
//fileio();
#endif
fastio();
int n, m;
cin>>n>>m;
for (int i = 1; i <= m; i++){
int u, v, w;
cin>>u>>v>>w;
adj[u].pb({v, w, i});
adj[v].pb({u, w, i});
}
dfs(1, 0, 0);
for (int i = 1; i <= m; i++){
if (mark[i]){
int x = val[i];
for (int j = LOGN; j >= 0; j--){
if (x & (1<<j)){
if (base[j] != 0){
x ^= base[j];
}
else{
base[j] = x;
break;
}
}
}
}
}
vector<int> ans[LOGN + 1];
for (int i = 1; i <= m; i++){
if (mark[i]){
int x = val[i];
for (int j = LOGN; j >= 0; j--){
if (x & (1<<j)){
ans[j].pb(i);
x ^= base[j];
}
}
}
}
int res = 0;
for (int i = LOGN; i >= 0; i--){
if (ans[i].size()) res++;
}
cout<<res<<endl;
for (int i = LOGN; i >= 0; i--){
if (ans[i].size()){
cout<<base[i]<<sp<<ans[i].size()<<sp;
for (auto j : ans[i])
cout<<j<<sp;
cout<<endl;
}
}
cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
22 ms |
9940 KB |
Output is correct |
2 |
Correct |
21 ms |
10172 KB |
Output is correct |
3 |
Correct |
9 ms |
6100 KB |
Output is correct |
4 |
Correct |
10 ms |
6268 KB |
Output is correct |
5 |
Correct |
42 ms |
14952 KB |
Output is correct |
6 |
Correct |
37 ms |
13952 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
10 ms |
7124 KB |
Output is correct |
2 |
Correct |
11 ms |
7380 KB |
Output is correct |
3 |
Correct |
13 ms |
8116 KB |
Output is correct |
4 |
Correct |
16 ms |
8660 KB |
Output is correct |
5 |
Correct |
38 ms |
14260 KB |
Output is correct |
6 |
Correct |
24 ms |
10700 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
30 ms |
10840 KB |
Output is correct |
2 |
Correct |
39 ms |
12700 KB |
Output is correct |
3 |
Correct |
2 ms |
4948 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
37 ms |
13880 KB |
Output is correct |
2 |
Correct |
68 ms |
18756 KB |
Output is correct |
3 |
Correct |
3 ms |
5204 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
33 ms |
11960 KB |
Output is correct |
2 |
Correct |
36 ms |
12744 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
49 ms |
14900 KB |
Output is correct |
2 |
Correct |
28 ms |
10068 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
43 ms |
14384 KB |
Output is correct |
2 |
Correct |
58 ms |
16872 KB |
Output is correct |
3 |
Correct |
36 ms |
12808 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
74 ms |
18460 KB |
Output is correct |
2 |
Correct |
86 ms |
20940 KB |
Output is correct |
3 |
Correct |
74 ms |
20228 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
14 ms |
7992 KB |
Output is correct |
2 |
Correct |
24 ms |
9108 KB |
Output is correct |
3 |
Correct |
50 ms |
15136 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
59 ms |
15444 KB |
Output is correct |
2 |
Correct |
28 ms |
11084 KB |
Output is correct |
3 |
Correct |
66 ms |
19316 KB |
Output is correct |