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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 |
---|---|---|---|---|---|---|---|---|---|
#328264 | #1844. Cactus | lefy | WA | 5ms | 34280kb | C++14 | 2.7kb | 2024-02-15 18:45:30 | 2024-02-15 18:45:31 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int N=3e5+10;
vector<int>e[N];
void add(int u,int v){
e[u].push_back(v);
}
vector<int>ans;
int du[N<<1],n,m,vis[N];
void solve1(){
queue<int>q;
for(int i=1;i<=n;i++)if(du[i]&1)q.push(i);
while(!q.empty()){
int x=q.front();q.pop();
if(vis[x]||du[x]%2==0)continue;
vis[x]=1;
for(int v:e[x])if(!vis[v]){
du[v]--;
if(du[v]&1)q.push(v);
}
ans.push_back(x);
}
}
int dcc,be[N],dfn[N],low[N],idd,st[N],top;
vector<int>b[N<<1];
vector<int>hav[N];
void Tarjan(int x){
st[++top]=x;
vis[x]=2,dfn[x]=low[x]=++idd;
for(int v:e[x])if(vis[v]!=1){
if(!dfn[v]){
Tarjan(v);
low[x]=min(low[x],low[v]);
if(low[v]>=dfn[x]){
dcc++;int y=0;
b[dcc+n].push_back(x);b[x].push_back(dcc+n);
du[x]++,du[dcc+n]++;
hav[dcc].push_back(x);
while(st[top]^x){
y=st[top--];
hav[dcc].push_back(y);
b[y].push_back(dcc+n),b[dcc+n].push_back(y);
du[y]++,du[dcc+n]++;
}
}
}else low[x]=min(low[x],dfn[v]);
}
}
void solve2(){
ans.push_back(-1);int sz=ans.size();
for(int i=0;i<sz-1;i++)ans.push_back(ans[i]);
memset(du,0,sizeof(du));
for(int i=1;i<=n;i++)if(!vis[i])Tarjan(i);
queue<int>q;for(int i=1;i<=n+dcc;i++)if(du[i]==1)q.push(i);
int tmp=0;
while(!q.empty()){
int x=q.front();q.pop();
for(int v:b[x]){
du[v]--;
if(du[v]==1)q.push(v);
}
if(x<=n)continue;
int sz=hav[x-n].size();x-=n;
tmp=hav[x][0];
for(int i=1;i<sz;i+=2)if(sz-i==3){
ans.push_back(hav[x][sz-1]);
ans.push_back(hav[x][sz-2]+n);
ans.push_back(hav[x][sz-3]+n);
ans.push_back(hav[x][sz-3]);
ans.push_back(hav[x][sz-2]);
ans.push_back(hav[x][sz-1]+n);
}else{
ans.push_back(hav[x][i]);
ans.push_back(hav[x][i+1]+n);
ans.push_back(hav[x][i+1]);
ans.push_back(hav[x][i]+n);
}
}
ans.push_back(tmp);
}
int main() {
scanf("%d%d",&n,&m);
for(int i=1;i<=m;i++){
int x,y;
scanf("%d%d",&x,&y);
add(x,y),add(y,x);
du[x]++,du[y]++;
}
solve1();
if(ans.size()!=n)solve2();
printf("0 %d\n",(int)ans.size());
for(int x:ans){
if(x==-1)printf("2*\n");
else printf("1 %d\n",x);
}
return 0;
}
详细
Test #1:
score: 0
Wrong Answer
time: 5ms
memory: 34280kb
input:
3 3 1 2 1 3 2 3
output:
0 6 2* 1 3 1 5 1 2 1 6 1 1
result:
wrong output format Expected integer, but "2*" found