Submission #48249553

---

Source Code Expand

// LUOGU_RID: 138554573
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;

#define rep(i,l,r) for(int i(l);i<=(r);++i)
#define per(i,r,l) for(int i(r);i>=(l);--i)
#define eb emplace_back
#define File(filename) freopen(filename ".in","r",stdin),freopen(filename ".out","w",stdout)

#ifdef EXODUS
	#define Debug(...) fprintf(stderr,__VA_ARGS__)
#else
	#define Debug(...) 0
#endif

//=========================================================================================================
// Something about IO

template<typename T>
void read(T &x){
	x=0;T flg=1;
	char ch=getchar();
	while(!isdigit(ch)){if(ch=='-')flg=-1;ch=getchar();}
	while(isdigit(ch))x=(x<<3)+(x<<1)+(ch^48),ch=getchar();
	x*=flg;
}
template<typename T,typename... Args>
void read(T &x,Args &...args){read(x),read(args...);}

//=========================================================================================================
// Define the global variables here.

bool membg=0;
constexpr int N=5e3+7;

int n,deg[N],p[N];
vector<int>g[N];
bool memed=0;

//=========================================================================================================
// Code here.


void solve(){
	read(n);
	for(int i=1,u,v;i<n;i++)read(u,v),g[u].eb(v),g[v].eb(u),deg[u]++,deg[v]++;
	queue<int>q;
	for(int i=1;i<=n;i++)if(deg[i]==1)q.emplace(i);
	while(q.size()>=2){
		int u=q.front();q.pop();
		int v=q.front();q.pop();
		p[u]=v,p[v]=u;
		for(auto w:g[u])if((--deg[w])==1)q.emplace(w);
		for(auto w:g[v])if((--deg[w])==1)q.emplace(w);
	}
	if(!q.empty())p[q.front()]=q.front();
	for(int i=1;i<=n;i++)printf("%d ",p[i]);
	printf("\n");
	return;
}


//=========================================================================================================

int main(){
	Debug("%.3lfMB\n",fabs(&memed-&membg)/1024.0/1024.0);
	int timbg=clock();
	int T=1;
	while(T--)solve();
	int timed=clock();
	Debug("%.3lfs\n",1.0*(timed-timbg)/CLOCKS_PER_SEC);
	fflush(stdout);
	return 0;
}

Submission Info

Compile Error

Main.cpp: In function ‘int main()’:
Main.cpp:18:28: warning: statement has no effect [-Wunused-value]
   18 |         #define Debug(...) 0
      |                            ^
Main.cpp:71:9: note: in expansion of macro ‘Debug’
   71 |         Debug("%.3lfMB\n",fabs(&memed-&membg)/1024.0/1024.0);
      |         ^~~~~
Main.cpp:18:28: warning: statement has no effect [-Wunused-value]
   18 |         #define Debug(...) 0
      |                            ^
Main.cpp:76:9: note: in expansion of macro ‘Debug’
   76 |         Debug("%.3lfs\n",1.0*(timed-timbg)/CLOCKS_PER_SEC);
      |         ^~~~~
Main.cpp:72:13: warning: unused variable ‘timbg’ [-Wunused-variable]
   72 |         int timbg=clock();
      |             ^~~~~
Main.cpp:75:13: warning: unused variable ‘timed’ [-Wunused-variable]
   75 |         int timed=clock();
      |             ^~~~~

Judge Result