QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#780644 | #6421. Degree of Spanning Tree | Symbolize | AC ✓ | 185ms | 19396kb | C++17 | 1.9kb | 2024-11-25 12:04:43 | 2024-11-25 12:04:43 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn = 2e5+10;
struct node{
int u,v;
}e[maxn];
vector<pair<int,int> > G[maxn];
bool vis[maxn];
int n,m,f[maxn],times[maxn],fa[maxn],dep[maxn];
int findx(int x)
{
return f[x]==x?x:f[x]=findx(f[x]);
}
void dfs(int u,int pre,int t)
{
dep[u]=dep[pre]+1;
f[u]=t;
for(auto to:G[u])
{
if(to.first==pre) continue;
dfs(to.first,u,t);
}
}
int main(){
int T;
scanf("%d",&T);
while (T--){
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
{
G[i].clear();
f[i]=i;
times[i]=0;
}
for(int i=1;i<=m;i++) vis[i]=0;
for(int i=1;i<=m;i++)
{
int u,v;
scanf("%d%d",&u,&v);
e[i] = {u,v};
int x = findx(u),y = findx(v);
if(x==y) continue;
G[u].push_back({v,i});
G[v].push_back({u,i});
f[x]=y;
vis[i]=1;
times[u]++;
times[v]++;
}
int rt = 0;
for(int i=1;i<=n;++i) if(times[i]>n/2) rt=i;
if(n==3)
{
printf("No\n");
continue;
}
f[rt]=rt;
dep[rt]=0;
for(auto to:G[rt])
{
fa[to.first]=to.second;
dfs(to.first,rt,to.first);
}
for(int i=1;i<=m;i++)
{
if(times[rt]<=n/2) break;
int u=e[i].u,v=e[i].v;
int x=findx(u),y=findx(v);
if(x==y||u==rt||v==rt) continue;
if(times[x]>times[y]) swap(u,v),swap(x,y);
++times[u];
++times[v];
--times[rt];
--times[y];
vis[i]=1;
vis[fa[y]]=0;
f[y]=x;
}
if(times[rt]>n/2) printf("No\n");
else
{
printf("Yes\n");
for(int i=1;i<=m;i++){
if(vis[i]) printf("%d %d\n",e[i].u,e[i].v);
}
}
}
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 2ms
memory: 12112kb
input:
2 6 9 1 2 1 3 1 4 2 3 2 4 3 4 4 5 4 6 4 6 3 4 1 3 2 3 3 3 1 2
output:
Yes 1 2 1 3 1 4 4 5 4 6 No
result:
ok 2 cases
Test #2:
score: 0
Accepted
time: 119ms
memory: 13404kb
input:
11140 10 15 9 6 5 7 6 5 2 3 7 5 7 5 3 10 9 7 5 5 9 1 7 5 2 8 7 5 4 3 6 2 9 19 3 7 3 9 2 8 2 8 3 6 5 1 1 8 8 9 8 3 4 8 5 5 3 1 4 3 1 3 8 6 1 3 7 4 4 3 8 8 12 20 10 2 5 5 2 4 3 3 3 3 5 11 9 2 5 5 7 12 11 3 3 3 3 5 5 3 3 1 4 6 7 11 6 8 4 5 6 12 6 5 8 18 4 2 4 3 2 4 2 4 4 3 4 8 2 2 6 7 2 4 6 2 1 4 8 7 4...
output:
Yes 9 6 5 7 6 5 2 3 3 10 9 1 2 8 4 3 6 2 Yes 3 7 3 9 2 8 3 6 5 1 1 8 8 9 4 8 Yes 10 2 2 4 5 11 9 2 7 12 11 3 3 1 4 6 7 11 6 8 4 5 Yes 4 2 4 3 4 8 6 7 6 2 1 4 7 5 Yes 6 5 5 7 5 9 4 3 2 9 2 3 8 7 5 1 Yes 10 2 2 6 3 2 1 9 8 10 4 6 6 1 2 5 1 7 Yes 5 7 5 4 7 1 2 6 6 7 1 3 Yes 12 3 1 13 7 8 8 2 10 6 1 6 1...
result:
ok 11140 cases
Test #3:
score: 0
Accepted
time: 182ms
memory: 17720kb
input:
5 100000 197799 37555 22723 91160 32701 6451 4416 43186 26432 9750 82955 28292 33907 91534 78442 17771 67061 40351 28116 21494 23114 34672 66640 72636 95093 13033 6538 53698 87837 79541 71230 53985 63500 84753 5378 67971 56748 90951 20169 4465 97293 18331 53564 41043 95738 48579 96439 90865 7526 391...
output:
Yes 37555 22723 91160 32701 6451 4416 43186 26432 9750 82955 28292 33907 91534 78442 17771 67061 40351 28116 21494 23114 34672 66640 72636 95093 13033 6538 53698 87837 79541 71230 53985 63500 84753 5378 67971 56748 90951 20169 4465 97293 18331 53564 41043 95738 48579 96439 90865 7526 39102 81376 166...
result:
ok 5 cases
Test #4:
score: 0
Accepted
time: 134ms
memory: 19128kb
input:
5 100000 100000 98195 31806 98195 70169 92153 98195 98195 46320 94369 56771 94369 49988 74295 98195 33796 98195 89903 94369 98195 1814 82388 98195 10189 94369 98195 6267 29845 98195 22425 94369 6241 98195 98195 33204 66516 98195 94369 71364 26277 94369 94369 94722 94369 25349 14629 98195 9329 98195 ...
output:
Yes 98195 31806 98195 70169 92153 98195 98195 46320 94369 56771 94369 49988 74295 98195 33796 98195 89903 94369 98195 1814 82388 98195 10189 94369 98195 6267 29845 98195 22425 94369 6241 98195 98195 33204 66516 98195 94369 71364 26277 94369 94369 94722 94369 25349 14629 98195 9329 98195 98195 38219 ...
result:
ok 5 cases
Test #5:
score: 0
Accepted
time: 185ms
memory: 19396kb
input:
5 100000 149998 50735 5447 50735 24875 15119 49666 50735 30352 44756 49555 26546 32695 98445 50735 71657 50735 92212 50735 50735 19382 30935 50735 43688 46767 54630 54562 31371 50735 48877 50735 78593 76833 74317 37258 50735 48236 67116 50735 36579 50735 37536 44353 50735 46602 35088 29568 86657 507...
output:
Yes 50735 5447 15119 49666 50735 30352 44756 49555 26546 32695 98445 50735 92212 50735 50735 19382 43688 46767 54630 54562 48877 50735 78593 76833 74317 37258 36579 50735 37536 44353 50735 46602 35088 29568 86657 50735 50735 61268 37159 50735 35719 50735 78147 8985 50735 58204 5089 21674 3651 54202 ...
result:
ok 5 cases
Test #6:
score: 0
Accepted
time: 104ms
memory: 16948kb
input:
11102 14 14 9 10 10 14 9 11 10 2 9 14 9 5 10 13 9 8 4 9 3 10 10 1 12 10 10 6 9 7 6 6 3 2 3 5 2 6 1 6 3 4 3 6 5 5 3 2 2 1 4 5 2 5 5 3 8 8 5 6 4 6 8 6 8 4 6 1 8 3 2 8 7 8 12 12 8 12 12 2 4 12 9 12 12 3 1 12 1 8 6 8 11 8 7 8 8 10 12 5 15 15 9 15 6 15 13 8 15 3 8 11 15 12 8 2 15 4 8 10 15 8 15 14 8 4 7 ...
output:
Yes 10 14 9 11 10 2 9 14 9 5 10 13 9 8 4 9 3 10 10 1 12 10 10 6 9 7 Yes 3 2 3 5 2 6 1 6 3 4 Yes 3 2 2 1 4 5 5 3 Yes 5 6 4 6 8 6 6 1 8 3 2 8 7 8 Yes 12 2 4 12 9 12 12 3 1 12 1 8 6 8 11 8 7 8 8 10 12 5 Yes 9 15 6 15 13 8 15 3 8 11 15 12 8 2 15 4 8 10 15 14 8 4 7 8 5 8 1 15 Yes 7 3 10 3 3 12 5 9 9 8 1 ...
result:
ok 11102 cases
Test #7:
score: 0
Accepted
time: 150ms
memory: 17772kb
input:
11102 14 19 9 3 3 6 8 3 2 14 7 3 11 3 13 9 3 14 3 5 2 3 7 4 1 10 13 3 4 3 3 1 3 10 12 8 11 6 3 12 11 15 9 11 10 7 1 2 9 6 11 2 11 10 8 11 11 5 3 8 11 4 11 3 11 7 1 11 5 4 6 11 5 6 1 2 4 3 3 5 1 3 5 4 3 2 12 16 8 11 12 10 12 3 5 7 12 5 1 12 9 4 12 2 6 12 12 8 10 1 12 11 7 12 12 9 3 2 4 12 6 7 3 1 6 3...
output:
Yes 9 3 8 3 2 14 7 3 11 3 13 9 3 14 3 5 7 4 1 10 3 1 12 8 11 6 Yes 9 11 10 7 1 2 9 6 11 2 11 10 8 11 11 5 3 8 5 4 Yes 1 2 3 5 1 3 5 4 Yes 8 11 12 10 12 3 5 7 12 5 9 4 6 12 12 8 10 1 12 9 3 2 Yes 3 4 4 6 3 2 5 3 5 1 Yes 4 3 1 6 2 5 1 5 1 4 Yes 1 2 3 6 7 5 4 11 2 6 9 6 7 6 6 4 3 10 8 9 Yes 5 1 4 1 3 5...
result:
ok 11102 cases
Test #8:
score: 0
Accepted
time: 103ms
memory: 12088kb
input:
100000 5 7 2 5 1 4 2 1 1 3 5 1 4 2 2 3 5 7 2 4 4 3 2 1 4 5 2 5 1 4 3 2 5 7 5 1 4 2 4 5 4 3 4 1 3 1 2 1 5 7 4 1 4 3 3 5 2 5 4 5 2 4 1 5 5 7 5 2 2 1 5 4 2 4 4 3 3 2 1 4 5 7 2 4 5 1 1 3 2 1 2 3 4 1 2 5 5 7 5 4 4 2 5 2 3 5 4 1 5 1 4 3 5 7 1 5 2 3 2 5 2 4 3 5 4 5 1 2 5 7 1 3 5 2 2 4 1 2 5 3 2 3 4 3 5 7 3...
output:
Yes 2 5 1 4 1 3 4 2 Yes 4 3 2 1 4 5 2 5 Yes 5 1 4 2 4 3 3 1 Yes 4 1 4 3 3 5 2 5 Yes 5 2 2 1 5 4 4 3 Yes 2 4 5 1 1 3 2 3 Yes 4 2 5 2 3 5 4 1 Yes 1 5 2 3 2 4 3 5 Yes 1 3 5 2 2 4 5 3 Yes 3 1 2 1 5 4 5 3 Yes 5 3 2 4 1 2 1 5 Yes 5 4 2 1 5 3 2 4 Yes 1 3 5 4 5 2 3 4 Yes 4 2 4 3 5 2 5 1 Yes 1 2 4 3 3 1 5 4 ...
result:
ok 100000 cases
Test #9:
score: 0
Accepted
time: 63ms
memory: 12108kb
input:
1000 5 970 3 1 4 3 3 1 1 3 2 3 2 3 3 2 2 3 2 3 2 3 3 2 3 2 3 1 2 3 3 2 3 2 2 3 2 3 3 2 3 2 2 3 3 2 2 3 2 3 3 5 2 3 2 3 2 3 3 2 3 2 5 3 2 3 3 2 2 3 3 2 3 2 3 1 3 2 3 5 3 2 2 1 2 3 3 5 2 3 2 3 5 3 3 2 3 1 3 2 3 2 1 3 4 3 3 1 4 3 5 3 3 2 3 4 2 3 3 5 2 3 3 1 3 2 2 3 4 3 2 3 2 3 1 3 3 1 2 3 3 2 3 2 2 3 2...
output:
Yes 4 3 3 5 2 1 5 2 Yes 3 1 3 4 5 2 4 5 Yes 3 5 1 5 2 4 4 3 Yes 4 2 4 1 5 3 5 1 Yes 1 3 4 3 5 2 5 1 Yes 1 5 3 1 2 4 2 3 Yes 4 3 4 5 2 1 1 5 Yes 3 1 1 2 4 5 4 2 Yes 4 2 5 4 1 3 5 3 Yes 5 1 3 1 2 4 5 2 Yes 3 5 3 2 1 4 4 5 Yes 5 2 5 3 4 1 4 3 Yes 1 2 3 2 4 5 1 4 Yes 5 4 5 3 1 2 3 2 Yes 5 2 3 2 4 1 3 1 ...
result:
ok 1000 cases
Test #10:
score: 0
Accepted
time: 83ms
memory: 12100kb
input:
100000 5 5 5 1 1 3 3 5 2 3 4 1 5 5 3 1 3 4 1 5 5 2 5 3 5 5 2 5 1 2 4 5 4 3 2 4 5 5 1 2 4 3 2 4 4 1 5 1 5 5 5 2 3 2 1 4 1 2 3 1 5 5 2 5 1 3 4 5 1 2 5 1 5 5 1 5 5 2 4 5 1 4 3 4 5 5 4 2 1 2 1 4 5 1 3 4 5 5 1 3 5 2 5 4 5 1 1 4 5 5 2 3 4 5 2 4 3 4 1 3 5 5 1 4 4 5 2 5 3 4 5 3 5 5 4 1 4 5 4 3 3 2 1 3 5 5 3...
output:
Yes 5 1 3 5 2 3 4 1 Yes 3 1 3 4 1 5 5 2 Yes 2 5 1 2 4 5 4 3 Yes 1 2 4 3 2 4 5 1 Yes 5 2 3 2 1 4 3 1 Yes 2 5 1 3 4 5 1 2 Yes 1 5 5 2 1 4 3 4 Yes 4 2 1 2 5 1 3 4 Yes 1 3 5 2 5 4 1 4 Yes 2 3 4 5 2 4 1 3 Yes 1 4 2 5 3 4 5 3 Yes 4 1 4 5 3 2 1 3 Yes 3 2 1 5 4 1 5 2 Yes 4 2 2 1 5 1 3 5 Yes 2 1 3 4 5 1 5 3 ...
result:
ok 100000 cases