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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#328166 | #1844. Cactus | Jryno1 | WA | 192ms | 164352kb | C++14 | 2.8kb | 2024-02-15 17:48:50 | 2024-02-15 17:48:50 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int maxn=2e6+10;
#define pii pair<int,int>
#define fi first
#define se second
#define mkp(x,y) make_pair(x,y)
vector<int>ed[maxn],lp[maxn],bel[maxn];
int del[maxn],deg[maxn],n,m,vis[maxn],dfn[maxn],sta[maxn],tp,cdfn;
int clp,nd[maxn],siz[maxn];
void dfs(int x,int pre){
dfn[x]=++cdfn,sta[++tp]=x;
for(auto v:ed[x]){
if(del[v]||v==pre)continue;
if(!dfn[v])dfs(v,x);
else if(dfn[v]<dfn[x]){
clp++;
for(int i=tp;;i--){//O(m)
lp[clp].push_back(sta[i]);
bel[sta[i]].push_back(clp);
siz[sta[i]]++;
if(sta[i]==v)break;
}
}
}
tp--;
}
vector<pii>ans;
int main(){
cin.tie(0),cout.tie(0),ios::sync_with_stdio(false);
cin>>n>>m;
for(int i=1;i<=m;i++){
int u,v;
cin>>u>>v;
ed[u].push_back(v);
ed[v].push_back(u);
deg[u]++,deg[v]++;
}
queue<int>Q;
for(int i=1;i<=n;i++)if(deg[i]&1)Q.push(i);
while(!Q.empty()){
int now=Q.front();
Q.pop();
if(del[now]||!(deg[now]&1))continue;
ans.push_back(mkp(1,now));
del[now]=1;
for(auto v:ed[now])deg[v]--,Q.push(v);
}
for(int i=1;i<=n;i++)deg[i]=0;
for(int i=1;i<=n;i++){
for(auto v:ed[i]){
if(i<v&&!del[i]&&!del[v])deg[i]++,deg[v]++;
}
}
for(int i=1;i<=n;i++)if(!deg[i])del[i]=1;
/*for(int i=1;i<=n;i++)cout<<i<<" "<<i+n<<"\n";
for(int i=1;i<=n;i++){
for(auto v:ed[i]){
if(i<v&&!del[i]&&!del[v])cout<<i<<" "<<v<<"\n",cout<<i+n<<" "<<v+n<<"\n";
}
}*/
ans.push_back(mkp(2,-1));
for(int i=1;i<=n;i++)if(del[i])ans.push_back(mkp(1,i));
for(int i=1;i<=n;i++)if(!del[i]&&!dfn[i])dfs(i,0);
// cout<<clp<<endl;
for(int i=1;i<=n;i++){
if(bel[i].size()>1)for(auto v:bel[i])nd[v]++;
}
for(int i=1;i<=clp;i++)if(nd[i]<=1)Q.push(i);
while(!Q.empty()){
int V=Q.front();
Q.pop();
if(vis[V])continue;
vis[V]=1;
int S=-1;
if(nd[V]==0)S=0;
else for(int i=0;i<lp[V].size();i++)if(siz[lp[V][i]]>1)assert(S==-1),S=i;
vector<int>R;
R.push_back(lp[V][S]);
for(int i=S+1;i<lp[V].size();i++)R.push_back(lp[V][i]);
for(int i=0;i<S;i++)R.push_back(lp[V][i]);
for(int i=1,o=1;i<R.size();i++,o^=1){
if(o)ans.push_back(mkp(1,R[i]));
else ans.push_back(mkp(1,R[i]+n));
}
if(R.size()>1)ans.push_back(mkp(1,R[1]+n));
if(R.size()>2){
if((R.size()-1)&1)ans.push_back(mkp(1,R[R.size()-1]+n));
else ans.push_back(mkp(1,R[R.size()-1]));
}
if(siz[R[0]]==1){
ans.push_back(mkp(1,R[0]));
} else {
siz[R[0]]--;
if(siz[R[0]]==1){
for(auto v:bel[R[0]]){
nd[v]--;
if(nd[v]<1&&!vis[v])Q.push(v);
}
}
}
}
cout<<0<<" "<<ans.size()<<"\n";
for(auto v:ans){
if(v.fi==1)cout<<v.fi<<" "<<v.se<<"\n";
else cout<<v.fi<<"\n";
}
return 0;
}
/*
8 10
1 2
2 4
1 4
3 4
3 5
5 6
3 6
3 7
3 8
7 8
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 22ms
memory: 144252kb
input:
3 3 1 2 1 3 2 3
output:
0 6 2 1 2 1 4 1 5 1 1 1 3
result:
ok You are right!
Test #2:
score: 0
Accepted
time: 20ms
memory: 144268kb
input:
7 7 1 2 1 3 2 3 2 4 2 5 3 6 3 7
output:
0 14 1 4 1 5 1 6 1 7 2 1 4 1 5 1 6 1 7 1 2 1 8 1 9 1 1 1 3
result:
ok You are right!
Test #3:
score: -100
Wrong Answer
time: 192ms
memory: 164352kb
input:
300000 368742 1 143504 1 234282 2 91276 2 296320 3 274816 4 212293 4 258214 5 253489 5 295826 6 96521 6 252745 6 267103 6 269879 7 5293 7 295586 8 44304 8 57067 8 233291 9 190526 10 18682 11 7440 12 24695 12 172561 12 243692 12 280316 13 80152 13 268749 14 146394 14 207280 15 151280 15 226848 16 458...
output:
0 520025 1 3 1 8 1 9 1 10 1 11 1 16 1 20 1 21 1 25 1 28 1 29 1 30 1 32 1 33 1 34 1 41 1 42 1 43 1 44 1 47 1 48 1 53 1 54 1 55 1 57 1 59 1 62 1 65 1 73 1 75 1 77 1 80 1 81 1 87 1 88 1 94 1 95 1 101 1 102 1 103 1 106 1 112 1 123 1 128 1 129 1 133 1 136 1 137 1 138 1 140 1 141 1 143 1 145 1 146 1 150 1...
result:
wrong answer The number of remaining edges is not equal to m'.