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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#674398#8941. Even or Odd Spanning TreerealmanWA 135ms16420kbC++142.1kb2024-10-25 15:34:232024-10-25 15:34:24

Judging History

你现在查看的是最新测评结果

  • [2024-10-25 15:34:24]
  • 评测
  • 测评结果:WA
  • 用时:135ms
  • 内存:16420kb
  • [2024-10-25 15:34:23]
  • 提交

answer

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int N=2e5+10,M=5e5+10;
int n,m,F[N],dep[N],f[N][21][2],fa[N][21],lg[N];ll ans[2];
vector<pair<int,int> > g[N];
struct Edge
{
	int u,v,w,op;
}e[M];
bool cmp(Edge x,Edge y)
{
	return x.w<y.w;
}

int find(int x)
{
	return F[x]=x==F[x]?x:find(F[x]);
}

int solve(int u,int v,int op)
{
	int maxx=-1e9;
	if(dep[u]<dep[v]) swap(u,v);
	for(int i=0;i<=lg[dep[u]-dep[v]];i++)
		if((1<<i)&(dep[u]-dep[v]))
			maxx=max(maxx,f[u][i][op]),u=fa[u][i];
	if(u==v) return maxx;
	for(int i=lg[dep[u]];i>=0;i--)
		if(fa[u][i]^fa[v][i])
		{
			maxx=max(maxx,f[u][i][op]),u=fa[u][i];
			maxx=max(maxx,f[v][i][op]),v=fa[v][i];
		}
	maxx=max(maxx,max(f[u][0][op],f[v][0][op]));
	return maxx;
}
void dfs(int p,int fath,int las)
{
	dep[p]=dep[fath]+1;
	fa[p][0]=fath;
	f[p][0][las&1]=las;
	f[p][0][las&1^1]=-1e9;
	for(int i=1;i<=lg[dep[p]];i++)
	{
		fa[p][i]=fa[fa[p][i-1]][i-1];
		for(int j=0;j<2;j++)
			f[p][i][j]=max(f[p][i-1][j],f[fa[p][i-1]][i-1][j]);
	}
	for(int i=0;i<g[p].size();i++)
	{
		int to=g[p][i].first;
		if(to==fath) continue;
		dfs(to,p,g[p][i].second);
	}
}
int main()
{
	int T;
	scanf("%d",&T);
	while(T--)
	{
		scanf("%d %d",&n,&m);
		for(int i=1;i<=n;i++) F[i]=i,g[i].clear();
		for(int i=2;i<=n;i++) lg[i]=lg[i>>1]+1;
		for(int i=1;i<=m;i++)
			scanf("%d %d %d",&e[i].u,&e[i].v,&e[i].w),e[i].op=0;
		sort(e+1,e+m+1,cmp);
		int cnt=0;ll sum=0;
		for(int i=1;i<=m;i++)
			if(find(e[i].u)!=find(e[i].v))
			{
				cnt++;e[i].op=1;sum+=e[i].w;
				g[e[i].u].push_back(make_pair(e[i].v,e[i].w));
				g[e[i].v].push_back(make_pair(e[i].u,e[i].w));
				F[find(e[i].u)]=find(e[i].v);
			}
		if(cnt!=n-1)
		{
			printf("-1 -1\n");
			continue;
		}
		ans[sum&1]=sum;
		ans[sum&1^1]=-1;
		dfs(1,0,-1e9);
		for(int i=1;i<=m;i++)
			if(!e[i].op)
			{
				int num=solve(e[i].u,e[i].v,e[i].w&1^1);
				if(num<0) continue;
				if(ans[sum&1^1]==-1ll) ans[sum&1^1]=sum-num+e[i].w;
				else ans[sum&1^1]=min(ans[sum&1^1],sum-num+e[i].w);
			}
		printf("%lld %lld\n",ans[0],ans[1]);
	}
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 14196kb

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: 0
Accepted
time: 102ms
memory: 16152kb

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 1309454727
1263932600 1307926149
1189242112 1180186165
2248358640 2261370885
3776889482 3738936375
1093500444 1058677117
3433711014 3402127725
1201099898 1187873655
1395482806 1410162043
3456885934 3486092007
3943951826 3988876469
2479987500 2535532661
2909126794 293...

result:

ok 20000 numbers

Test #3:

score: -100
Wrong Answer
time: 135ms
memory: 16420kb

input:

100
1806 5000
1 2 139994119
2 3 184924112
3 4 670813536
4 5 443325848
5 6 767909046
6 7 531742851
7 8 364385440
8 9 918195219
9 10 731896671
10 11 671688362
11 12 558665746
12 13 154497842
13 14 28636459
14 15 570343686
15 16 419626123
16 17 817852951
17 18 517701907
18 19 952451718
19 20 141747977
...

output:

380509244078 380509217939
236564714828 236564588423
317690341848 317690193297
416922743878 416923542879
411602058138 411996924725
231780454372 231575603125
156856996316 156856345151
239198911000 239278493321
288480848080 288481502909
347103891276 347301269265
362642903994 362643090967
158361335208 1...

result:

wrong answer 9th numbers differ - expected: '411997066938', found: '411602058138'