#include<bits/stdc++.h>
using namespace std;
#define int int64_t
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
int n, m;
vector<pair<int, int>> G[209];
vector<pair<pii, int>> edges;
vector<int> cur;
vector<pii> G2[209];
bool used[10009];
bool vis[209];
int p[209];
int Find(int x) {
return p[x]==x?x:p[x]=Find(p[x]);
}
void Union(int a, int b) {
p[Find(a)] = Find(b);
}
void dfs(int x, int y) {
vis[x] = true;
for(pii z:G2[x])
if(z.st!=y)
dfs(z.st, x);
}
bool improve() {
for(int i=0;i<n;i++) G2[i].clear();
for(int i=0;i<n-1;i++) {
auto e = edges[cur[i]];
G2[e.st.st].pb({e.st.nd, e.nd});
G2[e.st.nd].pb({e.st.st, e.nd});
}
for(int i=0;i<n-1;i++) {
auto e = edges[cur[i]];
memset(vis, 0, sizeof(vis));
dfs(e.st.st, e.st.nd);
for(int j=0;j<m;j++) {
if(!used[j]) {
auto ne = edges[j];
if(vis[ne.st.st]^vis[ne.st.nd]) {
if(ne.nd<e.nd) {
used[cur[i]] = false;
cur[i] = j;
used[j] = true;
return true;
}
}
}
}
}
return false;
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
iota(p, p+n, 0);
for(int i=0;i<m;i++) {
int a, b, c, _;
cin >> a >> b >> c >> _;
G[a].pb({b, c});
G[b].pb({a, c});
edges.pb({{a, b}, c});
}
random_shuffle(all(edges));
for(int i=0;i<m;i++) {
auto [x, y] = edges[i];
if(Find(x.st)!=Find(x.nd)) {
used[i] = true;
cur.pb(i);
Union(x.st, x.nd);
}
}
while(improve()) {}
int Sum=0;
vector<pii> ans;
for(int x:cur) {
Sum += edges[x].nd;
ans.pb(edges[x].st);
}
cout << Sum << " " << Sum << "\n";
for(pii x:ans)
cout << x.st << " " << x.nd << "\n";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
348 KB |
Output is correct |
| 5 |
Correct |
15 ms |
516 KB |
Output is correct |
| 6 |
Correct |
16 ms |
344 KB |
Output is correct |
| 7 |
Correct |
189 ms |
616 KB |
Output is correct |
| 8 |
Correct |
1244 ms |
1196 KB |
Output is correct |
| 9 |
Incorrect |
1 ms |
600 KB |
Output isn't correct |
| 10 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 11 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 12 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 13 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 14 |
Incorrect |
9 ms |
348 KB |
Output isn't correct |
| 15 |
Incorrect |
17 ms |
348 KB |
Output isn't correct |
| 16 |
Incorrect |
230 ms |
604 KB |
Output isn't correct |
| 17 |
Incorrect |
194 ms |
604 KB |
Output isn't correct |
| 18 |
Incorrect |
197 ms |
604 KB |
Output isn't correct |
| 19 |
Incorrect |
1095 ms |
1196 KB |
Output isn't correct |
| 20 |
Incorrect |
1162 ms |
1184 KB |
Output isn't correct |
