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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#820646 | #8941. Even or Odd Spanning Tree | Linver# | WA | 91ms | 3796kb | C++23 | 2.1kb | 2024-12-18 22:29:28 | 2024-12-18 22:29:29 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
typedef pair<int,int> PII;
const int N=4e5+10,M=1e5+10;
const int INF=1e18;
const int mod=998244353;
// const int mod=1e9+7;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
struct DSU {
std::vector<int> f, siz;
DSU() {}
DSU(int n) {
init(n);
}
void init(int n) {
f.resize(n);
std::iota(f.begin(), f.end(), 0);
siz.assign(n, 1);
}
int find(int x) {
while (x != f[x]) {
x = f[x] = f[f[x]];
}
return x;
}
bool same(int x, int y) {
return find(x) == find(y);
}
bool merge(int x, int y) {
x = find(x);
y = find(y);
if (x == y) {
return false;
}
siz[x] += siz[y];
f[y] = x;
return true;
}
int size(int x) {
return siz[find(x)];
}
};
struct Edge{
int u,v,w,op;
};
bool cmp(const Edge& x,const Edge &y){
return x.w<y.w;
}
void solve(){
int n,m;
cin>>n>>m;
vector<Edge> e;
for(int i=1;i<=m;i++){
int u,v,w;
cin>>u>>v>>w;
e.push_back({u,v,w});
}
sort(e.begin(),e.end(),cmp);
DSU dsu(n+1);
int ans=0,odd=INF,even=INF;
for(auto &[u,v,w,op]:e){
if(dsu.same(u,v))continue;
dsu.merge(u,v);
op=1;
ans+=w;
if(w&1)odd=min(odd,w);
else even=min(even,w);
}
// cout<<ans<<"\n";
if(dsu.size(1)==n-1){
cout<<"-1 -1\n";
return;
}
vector<int> W;
for(auto [u,v,w,op]:e){
if(!op)W.push_back(w);
}
sort(W.begin(),W.end());
int res=INF;
for(auto &x:W){
if(x%2==1&&even!=INF)res=min(res,ans-even+x);
if(x%2==0&&odd!=INF)res=min(res,ans-odd+x);
}
if(ans&1)swap(ans,res);
cout<<(ans==INF?-1:ans)<<" ";
cout<<(res==INF?-1:res)<<"\n";
}
signed main(){
cin.tie(0)->sync_with_stdio(0);
int T=1;
cin>>T;
while(T--)solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3588kb
input:
3 2 1 1 2 5 3 1 1 3 1 4 4 1 2 1 1 3 1 1 4 1 2 4 2
output:
-1 5 -1 -1 4 3
result:
ok 6 numbers
Test #2:
score: -100
Wrong Answer
time: 91ms
memory: 3796kb
input:
10000 16 50 1 2 649251632 2 3 605963017 3 4 897721528 4 5 82446151 5 6 917109168 6 7 79647183 7 8 278566178 7 9 573504723 3 10 679859251 8 11 563113083 1 12 843328546 10 13 594049160 11 14 997882839 7 15 569431750 2 16 244494799 16 7 960172373 13 4 317888322 13 3 446883598 9 3 678142319 5 8 43208692...
output:
3140067932 3159441841 1262790434 1334624821 1263932600 1565384431 1211478768 1180186165 2248358640 2475857269 4039559282 3738936375 1181933712 1058677117 3585912752 3402127725 1244594022 1187873655 1395482806 1440596255 3456885934 3600986359 3943951826 4089919585 2479987500 2559672535 2909126794 306...
result:
wrong answer 4th numbers differ - expected: '1309454727', found: '1334624821'