criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
#define F first
#define S second
#define pb push_back
#define mp make_pair
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define rrep(i,a,b) for(int i = a ; i >= b; i--)
#define debug(x) cout << '>' << #x << ':' << x << endl;
#define sq(a) (a)*(a)
#define nl "\n"
#define debug2(x, y) cout << #x << " = " << x << "   " << #y << " = " << y << nl;
using namespace std;
//using namespace __gnu_pbds;
//typedef tree<int,null_type,less<int>,rb_tree_tag,
//tree_order_statistics_node_update> indexed_set;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef vector<ii> vii;
typedef unsigned long long ull;
const int MAXN = 100005;
ll mod=1000000007;
vector<bool> vis(MAXN, false);
vector<int> adj[MAXN];
vector<int> R[2];

void dfs(int src, int par){
  vis[src] = 1;
  R[par].push_back(src);
  for(auto& x: adj[src]){
    if(!vis[x]){
        dfs(x, par^1);
    }
  }
}

bool comp(vector<int> a, vector<int> b){
  return a.size() < b.size();
}

int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  t = 1;
  // cin>>t;
  while(t--){
    int n;
    cin>>n;
    //trees are always bipartite. So distance three will have one red and another blue vertex
    rep(i,0,n-2){
      int u, v;
      cin>>u>>v;
      adj[u].push_back(v);
      adj[v].push_back(u);
    }
    dfs(1, 0);
    sort(R, R + 2, comp);
    int len2 = R[0].size();
    vector<int> P(n + 1,-1);
    if(len1 <= (n/3)){
      int j = 0;
      for(int i = 3; i <= n; i+=3){
          if(j == R[0].size())break;
          P[i] = R[0][j++];
      }
      int k = 0;
      for(int i = 1; i <= n; i++){
        if(P[i] == -1){
          P[i] = R[1][k++];
        }
      }
    }
    else{
      int j = 0;
      for(int i = 1; i <= n; i+=3){
        P[i] = R[0][j++];
      }
      int k = 0;
      for(int i = 2; i <= n; i+=3){
        P[i] = R[1][k++];
      }
      for(int i = 1; i <= n; i++){
        if(P[i] == -1){
          if(j < R[0].size()){
            P[i] = R[0][j++];
          }
          else{
            P[i] = R[1][k++];
          }
        }
      }
    }
    rep(i,1,n){
      cout<<P[i]<<" ";
    }
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:64:8: error: 'len1' was not declared in this scope; did you mean 'len2'?
   64 |     if(len1 <= (n/3)){
      |        ^~~~
      |        len2
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 10;
int n,ans[maxn],vis[maxn];
vector<int>g[maxn],v[2];
void dfs(int u = 1, int fa = 0, int t = 0)
{
	v[t].pb(u);
	for(int i = 0; i < (int) g[u].size(); ++i) 
	{
		int v = g[u][i];
		if(v==fa) 	continue;
		dfs(v,u,1-t);
	}
}
int main()
{
	int i,u,t;
	scanf("%d",&n);
	for(i=1;i<n;++i) 
	{
		scanf("%d %d",&u,&t);
		g[u].push_back(t);
		g[t].push_back(u);
	}
	dfs();
	if(v[0].size()>v[1].size()) 	swap(v[0],v[1]);
	int sum = n/3;
	if(v[0].size() <= sum) 
	{
		for(i=1;i<=n;++i)
		{
			if(!v[0].size()) break;
			if(i % 3 == 0) 
			{
				t = v[0].back();
				ans[t] = i;
				v[0].pop_back();
				vis[i]++;
			}
		}
	}
	else
	{
		for(i=1;i<=n;++i) 
		{
			if(!v[0].size()) break;
			if(i % 3 == 1) 
			{
				t = v[0].back();
				ans[t] = i;
				v[0].pop_back();
				vis[i]++;
			}
		}
		for(i=1;i<=n;++i) 
		{
			if(!v[0].size()) break;
			if(i%3==0) 
			{
				t = v[0].back();
				ans[t] = i;
				v[0].pop_back();
				vis[i]++;
			}
		}
	}
	for(i=1;i<=n;++i) 
	{
		if(!v[1].size()) 	break;
		if(!vis[i])
		{
			t = v[1].back();
			ans[t] = i;
			v[1].pop_back();
			vis[i]++;
		}
	}
	for(i=1;i<=n;++i) 	printf("%d ",ans[i]);
}


Compiler output:
a.cc: In function 'void dfs(int, int, int)':
a.cc:8:14: error: 'class std::vector<int>' has no member named 'pb'
    8 |         v[t].pb(u);
      |              ^~
Language: C++

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <cmath>
#include <climits>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <string>
#include <list>
#include <bitset>
#include <vector>
using namespace std;

#define I64d_OJ

//#ifdef I64d_OJ
//#define LL __int64
//#endif // I64d_OJ
#ifdef I64d_OJ
#define LL long long
#endif // I64d_OJ

typedef unsigned LL ULL;
typedef unsigned uint;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
typedef pair<LL,LL> pLL;
typedef vector<int> vi;

inline int read(){
    int x=0,f=1;
    char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-') f=-f; ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0'; ch=getchar();}
    return x*f;
}

#define lson l,mid,rt<<1
#define rson mid+1,r,rt<<1|1
#define ls rt<<1
#define rs rt<<1|1
#define MID(a,b) (((LL)(a)+(LL)(b))>>1)
#define absx(a) ((a)<0?-(a):(a))
#define MK(a,b) make_pair(a,b)
#define PB(a) push_back(a)
#define lowbit(x) ((x)&-(x))

#define lc c[x][0]
#define rc c[x][1]

template< typename T >
inline void Max(T &a,T &b){if(a<b) a=b;}
template< typename T>
inline void Min(T &a,T &b){if(a>b) a=b;}

const double pi=(double)acos(-1.0);
const double eps=(double)1e-8;
const int INF = (int) 0x3f3f3f3f;
const int MOD = (int) 998244353;
const int MAXN =(int) 2e5+10;
const int MAXM = (int) 3e6+10;

///--------------------START-------------------------
int N;
vector<int> G[MAXN];
int x,y,z,cnt;
int ans[MAXN];

void DFS(int u,int fa,int dep){
    if(dep){
        if(x<=N){
            ans[u]=x;
            x+=3;
        }
        else{
            ans[u]=z;
            z+=3;
        }
    }
    else{
        if(y<=N){
            ans[u]=y;
            y+=3;
        }
        else{
            ans[u]=z;
            z+=3;
        }
    }
    int sizu=G[u].size();
    for(int i=0;i<sizu;i++){
        int v=G[u][i];
        if(v==fa) continue;
        DFS(v,u,dep^1);
    }
}

void DFS1(int u,int fa,int dep){
    int sizu=G[u].size();
    if(dep) cnt++;
    for(int i=0;i<sizu;i++){
        int v=G[u][i];
        if(v==fa) continue;
        DFS1(v,u,dep^1);
    }
}

void work(){
    scanf("%d",&N);
    for(int i=1;i<N;i++){
        int u,v; scanf("%d%d",&u,&v);
        G[u].push_back(v);
        G[v].push_back(u);
    }
    x=1,y=2,z=3,cnt=0;
    DFS1(1,-1,1);
//    printf("cnt = %d\n",cnt);
    if(cnt<N-cnt4) swap(x,y);
    DFS(1,-1,1);
    for(int i=1;i<=N;i++){
        printf("%d",ans[i]);
        if(i==N) printf("\n");
        else printf(" ");
    }
}

///--------------------END-------------------------
int main(){
#ifdef NNever
//freopen("data.in","r",stdin);
///freopen("out.txt","w",stdout);
#endif // NNever
    work();
    return 0;
}





Compiler output:
a.cc: In function 'void work()':
a.cc:124:14: error: 'cnt4' was not declared in this scope; did you mean 'cnt'?
  124 |     if(cnt<N-cnt4) swap(x,y);
      |              ^~~~
      |              cnt
Language: C++

#include <iostream>
#include <algorithm>
#include <set>
#include <utility>

using namespace std;

void set_depth(set<int>* e, int* depth, int n, int dest){
    for(auto en = e[dest].begin(); en != e[dest].end(); en++){
        if(depth[*en] == 0){
            depth[*en] = depth[dest] + 1;
          	set_depth(e, depth, n, *en);
        }
    }  
}

int main(){
    int n, a, b;
    set<int> edge[200001];
    int depth[200001] = {};
  
    cin >> n;

    for(int i = 0; i < n - 1; i++){
        cin >> a >> b;
        edge[a].insert(b);
        edge[b].insert(a);
    }

    depth[1] = 1;

    set_depth(edge, depth, n, 1);
  
  	int n_odd = 0; k = 0;
  	for(int i = 1; i <= n; i++){
      if(depth[i] % 2 == 0) n_odd++;
    }
  	if(n_odd > n/2) k = 1; else k = 0;
  
  	int n1 = 0, n2 = 0, n3 = 1;
  	for(int i = 1; i <= n; i++){
		if(depth[i] % 2 == k){
			if(n2 * 3 + 1 <= n) cout << n2++ * 3 + 1;
          	else cout << n3++ * 3 ;
        }else{
			if(n1 * 3 + 2 <= n) cout << n1++ * 3 + 2;
          	else cout << n3++ * 3;
        }
      if(i < n)cout << " ";
    }
  	cout << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:24: error: 'k' was not declared in this scope
   34 |         int n_odd = 0; k = 0;
      |                        ^
Language: C++

#include <iostream>
#include <algorithm>
#include <set>
#include <utility>

using namespace std;

void set_depth(set<int>* e, int* depth, int n, int dest){
    for(auto en = e[dest].begin(); en != e[dest].end(); en++){
        if(depth[*en] == 0){
            depth[*en] = depth[dest] + 1;
          	set_depth(e, depth, n, *en);
        }
    }  
}

int main(){
    int n, a, b;
    set<int> edge[200001];
    int depth[200001] = {};
  
    cin >> n;

    for(int i = 0; i < n - 1; i++){
        cin >> a >> b;
        edge[a].insert(b);
        edge[b].insert(a);
    }

    depth[1] = 1;

    set_depth(edge, depth, n, 1);
  
  	int n_odd = 0; k = 0;
  	for(int i = 1; i <= n; i++){
      if(depth[i] % 2 == 1) n_odd++;
    }
  	if(n_odd > n/2) k = 0; else k = 1;
  
  	int n1 = 0, n2 = 0, n3 = 1;
  	for(int i = 1; i <= n; i++){
		if(depth[i] % 2 == k){
			if(n2 * 3 + 1 <= n) cout << n2++ * 3 + 1;
          	else cout << n3++ * 3 ;
        }else{
			if(n1 * 3 + 2 <= n) cout << n1++ * 3 + 2;
          	else cout << n3++ * 3;
        }
      if(i < n)cout << " ";
    }
  	cout << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:24: error: 'k' was not declared in this scope
   34 |         int n_odd = 0; k = 0;
      |                        ^
Language: C++

//2019年12月8日現在

#include<stdio.h>
#include<cmath>
#include<math.h>
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<complex>
#include<queue>
#include<set>
#include<utility>
#include<iomanip>
#include<limits>
#include<thread>
#include<map>
#include<stack>
#include<numeric>
#include<cassert>
#include<random>
#include<chrono>
#include<unordered_set>
#include<unordered_map>
#include<fstream>
#include<list>
#include<functional>
#include<bitset>
#include<tuple>
#include <cstdio>

using namespace std;

template <class... A>
void prints() { cout << "\n"; }
template <class... A>
void prints_rest() { cout << "\n"; }
template <class T, class... A>
void prints_rest(const T &first, const A &... rest) { cout << " " << first; prints_rest(rest...); }
template <class T, class... A>
void prints(const T &first, const A &... rest) { cout << first; prints_rest(rest...); }

namespace {
    // printElms(&a[0], a[n]);　みたいな感じで使う。
    void printElems(const int* begin, const int* end)
    {
        for (const int* p = begin; p != end; ++p) {
            std::cout << *p << ' ';
        }
        std::cout << std::endl;
    }
}

#define rep(i,n) for(int i=0; i<n; i++)
#define rep1(i,n) for(int i=1; i<n+1; i++)
#define repr(i,n) for(int i=n-1; i>=0; i--)
#define repr1(i,n) for(int i=n; i>0; i--)
#define FOR(i,j,n) for(int i=j; i < n; i++)
#define souatari rep1(i,n-1)rep(j,i)
#define souatari1 for(int i=2; i<n+1; i++)rep1(j,i-1)
#define mp make_pair
#define F first
#define S second
#define elif else if

typedef long long ll;
typedef vector<int>  vi;
typedef vector<vi>  vvi;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pii> vpii;
typedef array<int,3> arr3;
typedef long double D;


const ll llinf =  numeric_limits<ll>::max();
const ll _llinf = numeric_limits<ll>::lowest();
const int inf = numeric_limits<int>::max();
const int _inf = numeric_limits<int>::lowest();
const double dinf = numeric_limits<double>::infinity();
const ll MOD = 1000000007;
const ll BIG = 10000000000000000;


vi edge[200005];
int edepth[200005];


int main(){
	
	int n;
	cin >> n;
	rep(i,n-1) {
		int a,b;
		cin >> a >> b;
		edge[a].push_back(b);
		edge[b].push_back(a);
	}
	rep(i,200005) edepth[i] = -1;

	int oddcnt = 0;
	int evencnt = 0;

	//node,depth
	stack<pii> q;
	q.push(mp(0,0));

	while(!q.empty()){
		pii tmp = q.top();
		q.pop();
		edepth[tmp.F] = tmp.S;
		if(tmp.S%2 == 1){
			oddcnt++;
		}
		else{
			evencnt++;
		}
		for(const auto& i : edge[tmp.F]){
			if(edepth[i] != -1) continue;
			int ndepth = 1-tmp.S
			q.push(mp(i,ndepth));
		}
	}
	bool oddflag = false;
	bool evenflag = false;

	if(oddcnt*3<=n){
		prints()
	}
	if(evencnt*3<=n){

	}



	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:122:25: error: expected ',' or ';' before 'q'
  122 |                         q.push(mp(i,ndepth));
      |                         ^
a.cc:129:25: error: expected ';' before '}' token
  129 |                 prints()
      |                         ^
      |                         ;
  130 |         }
      |         ~
Language: C++

//omajinai c++
#include <iostream>
#include<cmath>
#include<vector>

#include <algorithm>

#include <limits>
#include <numeric>
#include <type_traits>
#include <map>
#include <string>
#include <iomanip>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define itn int
using ll = long long;
constexpr auto mod = 1000000007;
using namespace std;
int main() {

	/*

	+|0|1|2   *|0|1|2
	-------   -------
	0|0|1|2   0|0|0|0
	-------   -------
	1|1|2|0   1|0|1|2
	-------   -------
	2|2|0|1   2|0|2|1
	-------   -------
	!(pi と pjの和または積が 3の倍数である)
	=和も積も三の倍数ではない,のは
	(1,1),(2,2)

	「pi, pj を 3 で割ったあまりがともに 1 である、
	または、pi, pj を 3 で割ったあまりがともに 2 である」
	toki、距離が３ではない
	をみたす
	
	
	
	
	*/


Compiler output:
a.cc: In function 'int main()':
a.cc:20:13: error: expected '}' at end of input
   20 | int main() {
      |            ~^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef vector<ll> vl;
typedef pair<ll, ll> PP;
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define rep2(i, n) for(ll i = 1; i <= ll(n); i++)
#define MAX_N 200001

  vl g[MAX_N];//tree
  ll N,depth[MAX_N];
  
void dfs(ll b,ll p,ll d) { //b...current vertex , p...parent of b ,d...depth of b
  depth[b]=d;
  rep(i, g[b].size()) if(g[b][i]!=p) dfs(g[b][i],b,d+1);
}

void add_edge(ll a,ll b) {
    g[a].push_back(b);
    g[b].push_back(a);
}

int main() {
  cin >> N;//number of vertexes
  rep(i, N-1) {// input edges
    ll a,b;
    cin >> a >> b;
    add_edge(a,b);
  }
  dfs(1,0,0); //depth[i] = d(1,i)
  
  queue<ll> F0, F1, F2;
  ll t=0,
  while(3*t+1<=N) {F1.push(3*t+1); t++;} t=0;
  while(3*t+2<=N) {F2.push(3*t+2); t++;} t=0;
  while(3*t+3<=N) {F0.push(3*t+3); t++;}
  
  vl ans(N+1);
  ll even=0;
  rep2(i, N) if(depth[i]%2==0) even++;
  
  if(even <= N/3) {
    rep2(i, N) {
      if(depth[i]%2==0) {
        if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
      }else {
        if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
        else if(!F1.empty()) {ans[i]=F1.front(); F1.pop();}
        else if(!F2.empty()) {ans[i]=F2.front(); F2.pop();}
      }
    }
  }else if(even >= N-N/3) {
    rep2(i, N) {
      if(depth[i]%2==1) {
        if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
      }else {
        if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
        else if(!F1.empty()) {ans[i]=F1.front(); F1.pop();}
        else if(!F2.empty()) {ans[i]=F2.front(); F2.pop();}
      }
    }
  }else {
    rep2(i, N) {
      if(depth[i]%2==0) {
        if(!F1.empty()) {ans[i]=F1.front(); F1.pop();}
        else if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
      }else {
        if(!F2.empty()) {ans[i]=F2.front(); F2.pop();}
        else if(!F0.empty()) {ans[i]=F0.front(); F0.pop();}
      }
    }
  }
  
  rep2(i, N) cout << ans[i] << " ";
  cout << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:3: error: expected unqualified-id before 'while'
   34 |   while(3*t+1<=N) {F1.push(3*t+1); t++;} t=0;
      |   ^~~~~
Language: Java

import java.util.Scanner;
import java.util.ArrayDeque;
import java.util.ArrayList;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    ArrayList<Integer>[] edge  = new ArrayList[N];
    for(int i = 0; i < N; i++){
      edge[i] = new ArrayList<>();
    }
    while(sc.hasNext()) {
      int from = sc.nextInt()-1;
      int to = sc.nextInt()-1;
      edge[from].add(to);
      edge[to].add(from);
    }
    int ans[] = new int[N];
    int depth[] = new int[N];
    depth[0] = 1;
    int ki, gu;
    ki = gu = 0;
    ArrayDeque<Integer> adq = new ArrayDeque<>();
    adq.add(0);
    while(adq.size()>0){
      int now = adq.pollFirst();
      if(depth[now]==1){
        gu++;
      } else {
        ki++;
      }
      for(int next : edge[now]){
        if(depth[next]==0){
          depth[next] = -depth[now];
          adq.addLast(next);
        }
      }
    }
    int k, l, m;
    k = l = 0;
    m = 1;
    if(ki<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
          ans[i]=3*m;
          m++;
        } else {
          if(3*k+1<=N){
            ans[i]=3*k+1;
            k++;
          } else if(3*l+2<=N){
            ans[i]=3*l+2;
            l++;
          } else {
            ans[i]=3*m;
            m++;
          }
        }
      }
    }
    else if(gu<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==1) {
          ans[i]=3*m;
          check[ans[i]-1]=true;
          m++;
        } else {
          if(3*k+1<=N){
            ans[i]=3*k+1;
            k++;
          } else if(3*l+2<=N){
            ans[i]=3*l+2;
            l++;
          } else {
            ans[i]=3*m;
            m++;
          }
        }
      }
    }
    else {
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
          if(3*k+1<=N){
            ans[i]=3*k+1;
            k++;
          } else {
            ans[i]=3*m;
            m++;
          }
          check[ans[i]-1]=true;
        }
        else if(depth[i]==1){
          if(3*l+2<=N){
            ans[i]=3*l+2;
            l++;
          } else {
            ans[i]=3*m;
            m++;
          }
          check[ans[i]-1]=true;
        }
      }
    }
    int c = 0;
    for(int i=0;i<N;i++){
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
  }
}

Compiler output:
Main.java:66: error: cannot find symbol
          check[ans[i]-1]=true;
          ^
  symbol:   variable check
  location: class Main
Main.java:92: error: cannot find symbol
          check[ans[i]-1]=true;
          ^
  symbol:   variable check
  location: class Main
Main.java:102: error: cannot find symbol
          check[ans[i]-1]=true;
          ^
  symbol:   variable check
  location: class Main
Main.java:111: error: cannot find symbol
        while(check[c]){ 
              ^
  symbol:   variable check
  location: class Main
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors
Language: Java

import java.util.Scanner;
import java.util.ArrayDeque;
import java.util.ArrayList;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    ArrayList<Integer>[] edge  = new ArrayList[N];
    for(int i = 0; i < N; i++){
      edge[i] = new ArrayList<>();
    }
    while(sc.hasNext) {
      int from = sc.nextInt()-1;
      int to = sc.nextInt()-1;
      edge[from].add(to);
      edge[to].add(from);
    }
    int ans[] = new int[N];
    int depth[] = new int[N];
    depth[0] = 1;
    int ki, gu;
    ki = gu = 0;
    ArrayDeque<Integer> adq = new ArrayDeque<>();
    adq.add(0);
    while(adq.size()>0){
      int now = adq.pollFirst();
      if(depth[now]==1){
        gu++;
      } else {
        ki++;
      }
      for(int next : edge[now]){
        if(depth[next]==0){
          depth[next] = -depth[now];
          adq.addLast(next);
        }
      }
    }
    boolean check[] = new boolean[N];
    int k, l, m;
    k = l = 0;
    m = 1;
    if(ki<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(gu<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else {
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
          if(k<=three){
            ans[i]=3*k+1;
            k++;
          } else {
            ans[i]=3*m;
            m++;
          }
          check[ans[i]-1]=true;
        }
        else if(depth[i]==1){
          if(l<=three){
            ans[i]=3*l+2;
            l++;
          } else {
            ans[i]=3*m;
            m++;
          }
          check[ans[i]-1]=true;
        }
      }
    }
    int c = 0;
    for(int i=0;i<N;i++){
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
    for(int i = 0; i < N; i++){
      System.err.println(depth[i]);
    }
  }
}


Compiler output:
Main.java:13: error: cannot find symbol
    while(sc.hasNext) {
            ^
  symbol:   variable hasNext
  location: variable sc of type Scanner
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
Language: Java

import java.util.Scanner;
import java.util.ArrayDeque;
import java.util.ArrayList;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    ArrayList<Integer>[] edge  = new ArrayList[N];
    for(int i = 0; i < N; i++){
      edge[i] = new ArrayList<>();
    }
    while(sc.hasNext) {
      int from = sc.nextInt()-1;
      int to = sc.nextInt()-1;
      edge[from].add(to);
      edge[to].add(from);
    }
    int ans[] = new int[N];
    int depth[] = new int[N];
    depth[0] = 1;
    int ki, gu;
    ki = gu = 0;
    ArrayDeque<Integer> adq = new ArrayDeque<>();
    adq.add(0);
    while(adq.size()>0){
      int now = adq.pollFirst();
      if(depth[now]==1){
        gu++;
      } else {
        ki++;
      }
      for(int next : edge[now]){
        if(depth[next]==0){
          depth[next] = -depth[now];
          adq.addLast(next);
        }
      }
    }
    boolean check[] = new boolean[N];
    int k, l, m;
    k = l = 0;
    m = 1;
    if(ki<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(gu<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else {
      for(int i=0;i<N;i++){
        if(depth[i]==-1&&k<=three) {
          ans[i]=3*k+2;
          check[ans[i]-1]=true;
          k++;
        }
        else if(depth[i]==1&&l<=three){
          ans[i]=3*l+1;
          check[ans[i]-1]=true;
          l++;
        }
      }
    }
    int c = 0;
    for(int i=0;i<N;i++){
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
    for(int i = 0; i < N; i++){
      System.err.println(depth[i]);
    }
  }
}


Compiler output:
Main.java:13: error: cannot find symbol
    while(sc.hasNext) {
            ^
  symbol:   variable hasNext
  location: variable sc of type Scanner
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
Language: Java

import java.util.Scanner;
import java.util.ArrayDeque;
import java.util.ArrayList;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    ArrayList<Integer>[] edge  = new ArrayList[N];
    for(int i = 0; i < N; i++){
      edge[i] = new ArrayList<>();
    }
    for(int i = 0; i < n-1; i++) {
      int from = sc.nextInt()-1;
      int to = sc.nextInt()-1;
      edge[from].add(to);
      edge[to].add(from);
    }
    int ans[] = new int[N];
    int depth[] = new int[N];
    depth[0] = 1;
    int ki, gu;
    ki = gu = 0;
    ArrayDeque<Integer> adq = new ArrayDeque<>();
    adq.add(0);
    while(adq.size()>0){
      int now = adq.pollFirst();
      if(depth[now]==1){
        gu++;
      } else {
        ki++;
      }
      for(int next : edge[now]){
        if(depth[next]==0){
          depth[next] = -depth[now];
          adq.addLast(next);
        }
      }
    }
    boolean check[] = new boolean[N];
    int k, l, m;
    k = l = 0;
    m = 1;
    if(ki<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(gu<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else {
      for(int i=0;i<N;i++){
        if(depth[i]==-1&&k<=three) {
          ans[i]=3*k+2;
          check[ans[i]-1]=true;
          k++;
        }
        else if(depth[i]==1&&l<=three){
          ans[i]=3*l+1;
          check[ans[i]-1]=true;
          l++;
        }
      }
    }
    int c = 0;
    for(int i=0;i<N;i++){
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
    for(int i = 0; i < N; i++){
      System.err.println(depth[i]);
    }
  }
}


Compiler output:
Main.java:13: error: cannot find symbol
    for(int i = 0; i < n-1; i++) {
                       ^
  symbol:   variable n
  location: class Main
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
Language: Java

import java.util.Scanner;
import java.util.ArrayDeque;
import java.util.ArrayList;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    ArrayList<Integer>[] edge  = new ArrayList[N];
    for(int i = 0; i < N; i++){
      edge[i] = new ArrayList<>();
    }
    for(int i = 0; i < n-1; i++) {
      int from = sc.nextInt()-1;
      int to = sc.nextInt()-1;
      edge[from].add(to);
      edge[to].add(from);
    }
    int ans[] = new int[N];
    int depth[] = new int[N];
    depth[0] = 1;
    int ki, gu;
    ki = gu = 0;
    ArrayDeque<Integer> adq = new ArrayDeque<>();
    adq.add(0);
    while(adq.size()>0){
      int now = adq.pollFirst();
      if(depth[now]==1){
        gu++;
      } else {
        ki++;
      }
      for(int next : edge[now]){
        if(depth[next]==0){
          depth[next] = -depth[now];
          adq.addLast(next);
        }
      }
    }
    boolean check[] = new boolean[N];
    int k, l, m;
    k = l = 0;
    m = 1;
    if(ki<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==-1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(gu<=three){
      for(int i=0;i<N;i++){
        if(depth[i]==1) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else {
      for(int i=0;i<N;i++){
        if(depth[i]==-1&&k<=three) {
          ans[i]=3*k+1;
          check[ans[i]-1]=true;
          k++;
        }
        else if(depth[i]==1&&l<=three){
          ans[i]=3*l+2;
          check[ans[i]-1]=true;
          l++;
        }
      }
    }
    int c = 0;
    for(int i=0;i<N;i++){
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
    for(int i = 0; i < N; i++){
      System.err.println(depth[i]);
    }
  }
}

Compiler output:
Main.java:13: error: cannot find symbol
    for(int i = 0; i < n-1; i++) {
                       ^
  symbol:   variable n
  location: class Main
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
template<typename T>
void fin(T a){
  cout<<a<<endl;
  exit(0);
}
struct tree{
  vector<vector<int>> G,son,ancestor;
  vector<int> depth,parent;
  queue<int> que;
  int root=-1;
  bool made_lca=false;

  tree(int n):G(n),son(n),parent(n,-1),depth(n,-1),ancestor(n){
    for(int i=0;i<n;i++)ancestor[i].resize(30);
  }

  void add_edge(int u,int v){
    G[u].push_back(v);
    G[v].push_back(u);
  }

  inline void reset_root(){
    root=-1;
    fill(depth.begin(),depth.end(),-1);
    fill(parent.begin(),parent.end(),-1);
    for(auto &p:ancestor)for(int &q:p)q=-1;
    for(auto &p:son)p.resize(0);
    made_lca=false;
  }

  void have_root(int r){
    reset_root();
    root=r;
    que.push(r);
    while(que.size()){
      int p=que.front();que.pop();
      for(int q:G[p]){
        if(parent[p]==q)continue;
        son[p].push_back(q);
        parent[q]=p;
        que.push(q);
      }
    }
  }

  void set_depth(){
    assert(~root);
    depth[root]=0;
    que.push(root);
    while(que.size()){
      int p=que.front();que.pop();
      for(int q:son[p]){
        depth[q]=depth[p]+1;
        que.push(q);
      }
    }
  }

  inline void make_lca(){
    assert(~root);
    if(depth[root]<0)set_depth();
    for(int i=0;i<G.size();i++)ancestor[i][0]=parent[i];
    for(int j=1;j<30;j++)
      for(int i=0;i<G.size();i++)
        if(~ancestor[i][j-1])
          ancestor[i][j]=ancestor[ancestor[i][j-1]][j-1];
    made_lca=1;
  }

  int lca(int u,int v){
    if(!made_lca)make_lca();
    if(depth[u]>depth[v])swap(u,v);
    int diff=depth[v]-depth[u],cnt=0;
    while(diff){
      if(diff&1)v=ancestor[v][cnt];
      cnt++;
      diff>>=1;
    }
    if(u==v)return u;
    for(int k=28;k>=0;k--)
      if(ancestor[u][k]!=ancestor[v][k])
        u=ancestor[u][k],v=ancestor[v][k];
    return ancestor[u][0];
  }
};
int n,odd,now1,now2,now3,ans[223456];
int one(int a){
  if(now1*3+1<=n)return now1++*3+1;
  return -1;
}
int two(int a){
  if(now2*3+2<=n)return now2++*3+2;
  return -1;
}
int three(int a){
  return now3++*3+3;
}

signed main(){
  cin>>n;
  tree t(n);
  for(int i=1;i<n;i++){
    int u,v;cin>>u>>v;u--;v--;
    t.add_edge(u,v);
  }
  t.have_root(0);
  t.set_depth();
  for(int i=0;i<n;i++)odd+=t.depth[i]&1;
  if(odd<=n/3){
    for(int i=0;i<n;i++){
      if(t.depth[i]&1)ans[i]=three(i);
      else ans[i]=one(i);
      if(!~ans[i])ans[i]=two(i);
      if(!~ans[i])ans[i]=three(i);
    }
  }
  else if(n-odd<=n/3){
    for(int i=0;i<n;i++){
      if(!(t.depth[i]&1))ans[i]=three(i);
      else ans[i]=one(i);
      if(!~ans[i])ans[i]=two(i);
      if(!=ans[i])ans[i]=three(i);
    }
  }
  else{
    for(int i=0;i<n;i++){
      if(t.depth[i]&1)ans[i]=one(i);
      else ans[i]=two(i);
      if(!~ans[i])ans[i]=three(i);
    }
  }
  for(int i=0;i<n;i++)cout<<ans[i]<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:124:10: error: expected primary-expression before '!=' token
  124 |       if(!=ans[i])ans[i]=three(i);
      |          ^~
Language: C++

#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<vector>
#include<iomanip>
#include<math.h>
#include<complex>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<set>
#include<bitset>
#include<functional>
#include<assert.h>
#include<numeric>
using namespace std;
#define REP(i,m,n) for(int i=(int)(m) ; i < (int) (n) ; ++i )
#define rep(i,n) REP(i,0,n)
using ll = long long;
const int inf=1e9+7;
const ll longinf=1LL<<60 ;
const ll mod=1e9+7 ;
#define PI 3.141592653589793



void DFS(int a, int b, int c){
  tmp[a] = c;
  for(int k:G[a]){
    if(k==b) continue;
    DFS(k, a, 1-c);
  }
}
    
int main(){
  int N; cin >> N;
  rep(i, N-1){
    int a, b; cin >> a >> b; a--; b--;
    G[a].push_back(b); G[b].push_back(a);
  }
  DFS(0, -1, 0);
  int cnta=0, cntb=0, cntc=1, ki=0, gu=0; int ans[N];
  bool kyokutan = false;
  rep(i, N){
    if(tmp[i]%2 && 3*cnta+1<=N){
      ans[i] = 3*cnta + 1; cnta++;
    }
    else if(tmp[i]%2==0 && 3*cntb+2<=N){
      ans[i] = 3*cntb + 2; cntb++;
    }
    else if(3*cntc<=N){
      ans[i] = 3*cntc; cntc++;
    }
    else{
      kyokutan = true; break;
    }
  }
  cnta=0, cntb=0, cntc=1;
  int cnt = 0, check;
  if(kyokutan){
    rep(i, N){
      if(tmp[i]%2) ki++;
      else gu++;
    }
    if(ki>gu) check = 0;
    else check = 1;
    rep(i, N){
      if(tmp[i]%2==check){
        ans[i] = 3*cntc;
        cntc++;
      }
      else{
        if(cnt%2==0 && 3*cnta+1<=N){ans[i] = 3*cnta + 1; cnta++;}
        else if(cnt%2 && 3*cntb+2<=N){ans[i] = 3*cntb + 2; cntb++;}
        else if(3*cntc<=N){
          ans[i] = 3*cntc; cntc++;
        }
        else{
          cout << -1 << endl; return 0;
        }
        cnt++;
      }
    }
  }
  rep(i, N){
    cout << ans[i] << endl;
  }
}

Compiler output:
a.cc: In function 'void DFS(int, int, int)':
a.cc:30:3: error: 'tmp' was not declared in this scope; did you mean 'tm'?
   30 |   tmp[a] = c;
      |   ^~~
      |   tm
a.cc:31:13: error: 'G' was not declared in this scope
   31 |   for(int k:G[a]){
      |             ^
a.cc: In function 'int main()':
a.cc:41:5: error: 'G' was not declared in this scope
   41 |     G[a].push_back(b); G[b].push_back(a);
      |     ^
a.cc:47:8: error: 'tmp' was not declared in this scope; did you mean 'tm'?
   47 |     if(tmp[i]%2 && 3*cnta+1<=N){
      |        ^~~
      |        tm
a.cc:64:10: error: 'tmp' was not declared in this scope; did you mean 'tm'?
   64 |       if(tmp[i]%2) ki++;
      |          ^~~
      |          tm
a.cc:70:10: error: 'tmp' was not declared in this scope; did you mean 'tm'?
   70 |       if(tmp[i]%2==check){
      |          ^~~
      |          tm
Language: C++

#include <bits/stdc++.h>
 
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef pair<ll, ll> pii;
 
#define REP(a,b,c) for(ll (a)=(b);(a)<(c);(a)++)
#define PER(a,b,c) for(ll (a)=(b);(a)>=(c);(a)--)
 
void ii(ll &x){ cin >> x; }
void is(string &x){ cin >> x; }
void oi(ll &x){ cout << x << " "; }
void os(string &x){ cout << x; }
void oie(ll &x){ cout << x << endl; }
void ose(string &x){ cout << x << endl; }
void oe(){ cout << endl; }
 
int main(){
    ll N;
    ii(N);
    vector<vector<ll>> E(N);
    REP(i,0,N-1){
        ll a,b;
        ii(a), ii(b);
        a--; b--;
        E[min(a,b)].push_back(max(a,b));
    }
    stack<pair<ll, bool>> s;
    s.push(make_pair(0,true));
    vector<ll> blue_pts;
    vector<ll> red_pts;
    while(!s.empty()){
        auto c=s.top(); s.pop();
        if(c.second==true){
            blue_pts.push_back(c.first+1);
        }else{
            red_pts.push_back(c.first+1);
        }
        for(ll i:E[c.first]){
            s.push(make_pair(i,!c.second));
        }
    }
    ll blue_idx=0, red_idx=0;
    vector<ll> ret(N);
    if(blue_pts.size()<=N/3){
        REP(i,1,N+1){
            if(i%3==0 && blue_idx < blue_pts.size()){
                ret[i-1]=blue_pts[blue_idx++];
            }else{
                ret[i-1]=red_pts[red_idx++];
            }
        }
    }else if(red_pts.size()<=N/3){
        REP(i,1,N+1){
            if(i%3==0 && red_idx < red_pts.size(){
                ret[i-1]=red_pts[red_idx++];
            }else{
                ret[i-1]=blue_pts[blue_idx++];
            }
        }
    }else{
        for(ll i=1;i<=N;i+=3){
            ret[i-1]=blue_pts[blue_idx++];
        }
        for(ll i=2;i<=N;i+=3){
            ret[i-1]=red_pts[red_idx++];
        }
        for(ll i=3;i<=N;i+=3){
            if(blue_idx<blue_pts.size()){
                ret[i-1]=blue_pts[blue_idx++];
            }else{
                ret[i-1]=red_pts[red_idx++];
            }
        }
    }
    REP(i,0,N){
        oi(ret[i]);
    }
    oe();
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:56:50: error: expected ')' before '{' token
   56 |             if(i%3==0 && red_idx < red_pts.size(){
      |               ~                                  ^
      |                                                  )
a.cc:61:9: error: expected primary-expression before '}' token
   61 |         }
      |         ^
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <string>
#include <queue>
#include <tuple>

using namespace std;

using int64 = long long;

const int64 INF = (1LL<<60);

int N;
vector<vector<int>> g;

vector<int> color[2];

void dfs(int v, int p, int col) {
    color[col].push_back(v);
    for (auto el : g[v]) {
        if (el != p) {
            dfs(el, v, (col + 1) & 1);
        }
    }
}

void Exit() {
    cout << "-1\n";
    exit(0);
}

int main() {
    cin >> N;
    g.resize(N);

    for (int i = 0; i < N - 1; i++) {
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].push_back(b);
        g[b].push_back(a);
    }

    dfs(0, 0, 0);

    int n0 = color[0].size();
    int n1 = color[1].size();

    int v[3] = {0, 0, 0};

    for (int i = 1; i <= N; i++) {
        v[i % 3]++;
    }

    int mv = min(v[1], v[2]);

    if (n0 > n1) {
        swap(color[0], color[1]);
        swap(n0, n1);
    }

    // vector<int> order;

    // for (int i = 3; i <= N; i += 3)
    //     order.push_back(i);

    // if (v[1] > v[2]) {
    //     for (int i = 1; i <= N; i += 3)
    //         order.push_back(i);
    //     for (int i = 2; i <= N; i += 3)
    //         order.push_back(i);        
    // } else {
    //     for (int i = 2; i <= N; i += 3)
    //         order.push_back(i);
    //     for (int i = 1; i <= N; i += 3)
    //         order.push_back(i);
    // }

    vector<int> filler;
    for (int i = 3; i <= N; i += 3)
        filler.push_back(i);

    int x1 = 1, x2 = 2;

    if (v[1] < v[2]) {
        swap(v[1], v[2]);
        swap(x1, x2);
    }

    vector<int> p(N, -1);

    //cerr << v[0] << " " << v[1] << " " << v[2] << "\n";
    //cerr << n0 << " " << n1 << "\n";

    if (v[1] >= v[2]) {
        if (v[2] > n0 || v[1] > n1)
            Exit();

        int idx0 = 0;
        int idx1 = 0;
        int idxf = 0;

        for (int i = 0; i < v[2]; i++) {
            //cerr << color[idx0++] << " " << 3 * i + x2 << "\n";
            p[ color[0][idx0++] ] = 3 * i + x2; 
        }

        for (int i = v[2]; i < n0; i++) {
            p[ color[0][idx0++] ] = filler[idxf++];
        }

        //

        for (int i = 0; i < v[1]; i++) {
            p[ color[1][idx1++] ] = 3 * i + x1; 
        }

        for (int i = v[1]; i < n1; i++) {
            p[ color[1][idx1++] ] = filler[idxf++];
        }

        assert(idx0 == n0);
        assert(idx1 == n1);
        assert(idxf == filler.size());
    }

    for (int i = 0; i < N; i++)
        cout << p[i] << " ";
    cout << "\n";

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:124:9: error: 'assert' was not declared in this scope
  124 |         assert(idx0 == n0);
      |         ^~~~~~
a.cc:7:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
    6 | #include <queue>
  +++ |+#include <cassert>
    7 | #include <tuple>
Language: C++

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
constexpr ll INF = 9e18;
constexpr int inf = 1e9;
constexpr double INFD = 1e100;
constexpr ll mod = 1000000007;
const double PI = 3.1415926535897932384626433832795028841971;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
// ---------------------------------------------------------------------------

int main(){
  int N;
  cin >> N;
  vector<vector<int>> G(N);
  for(int i=0; i<N-1; i++){
    int a,b;
    cin >> a >> b;
    a--;
    b--;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  vector<int> dist(N,-1);
  queue<int> que;
  que.push(0);
  dist[0] = 0;
  while(que.size()){
    int v = que.front();
    que.pop();
    for(int nv: G[v]){
      if(dist[nv] != -1) continue;
      dist[nv] = dist[v] + 1;
      que.push(nv);
    }
  }
  int odd=0,even=0;
  for(int i=0; i<N; i++){
    if(dist[i]%2){
      odd++;
    }else{
      even++;
    }
  }
  vector<int> ans(N);
  int c1=1,c2=2,c3=3;
  if(odd >= N/3 and even >= N/3){
    for(int i=0; i<N; i++){
      if(dist[i]%2 and c1<=N){
        ans[i] = c1;
        c1 += 3;
      }else if(dist[i]%2==0 and c2<=N){
        ans[i] = c2;
        c2 += 3;
      }else{
        ans[i] = c3;
        c3 += 3;
      }
    }
  }else if(odd =< N/3){
    for(int i=0; i<N; i++){
      if(dist[i]%2){
        ans[i] = c3;
        c3 += 3;
      }else{
        if(c1<=N){
          ans[i] = c1;
          c1 += 3;
        }else if(c2<=N){
          ans[i] = c2;
          c2 += 3;
        }else{
          ans[i] = c3;
          c3 += 3;
        }
      }
    }
  }else{
    for(int i=0; i<N; i++){
      if(dist[i]%2){
        if(c1<=N){
          ans[i] = c1;
          c1 += 3;
        }else if(c2<=N){
          ans[i] = c2;
          c2 += 3;
        }else{
          ans[i] = c3;
          c3 += 3;
        }
      }else{
        ans[i] = c3;
        c3 += 3;
      }
    }
  }
  for(int i=0; i<N; i++){
    cout << ans[i] << (i!=N-1 ? " " : "\n");
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:64:17: error: expected primary-expression before '<' token
   64 |   }else if(odd =< N/3){
      |                 ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N = 2e5 + 5, INF = 0x3f3f3f3f;
inline int read() {
	int x = 0, f = 0; char ch = 0;
	while (!isdigit(ch)) f |= ch == '-', ch = getchar();
	while (isdigit(ch)) x = (x << 3) + (x << 1) + (ch ^ 48), ch = getchar();
	return f ? -x : x;
}
int ans[N];
vector <int> G[N], col[2], mod[3];
void dfs(int x, int c, int fa) {
	col[c].push_back(x);
	for (auto y : G[x]) if (y != fa) dfs(y, c ^ 1, x);
}
void sol(int i, int j) {
	while (!col[i].empty() && !mod[j].empty()) {
		ans[col[i].back()] = mod[j].back();
		col[i].pop_back(), mod[j].pop_back();
	}
}
int main() {
	int n = read();
	for (int i = 1; i < n; i++) {
		int x = read(), y = read();
		G[x].pb(y), G[y].pb(x);
	}
	for (int i = 1; i <= n; i++) mod[i % 3].pb(i);
	dfs(1, 0, 0);
	sol(col[0].size() < col[1].size(), 1), sol(col[0].size() < col[1].size(), 2);
	sol(0, 0), sol(1, 0);
	for (int i = 1; i <= n; i++) printf("%d ", ans[i]);
	return 0;
}/kk

Compiler output:
a.cc:35:2: error: expected unqualified-id before '/' token
   35 | }/kk
      |  ^
Language: C++

#include <bits/stdc++.h>
 
#define f first
#define s second
#define pb push_back
#define mp make_pair
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
 
const int N = (int)2e5 + 123, inf = 1e9, mod = 1e9 + 7;
const ll INF = 1e18;
 
vector< int > g[N], a[2], b[3];
int n, m, c[N], ans[N];
void dfs(int v, int p){
	c[v] = c[p] ^ 1;
	a[c[v]].pb(v);
	for(auto to : g[v])
		if(to != p)
			dfs(to, v);
}            
int aa(int i){
	int x = a[i].back();
	a[i].pop_back();
	return x;
}
int bb(int i){
	int x = b[i].back();
	b[i].pop_back();
	return x;
}
void ff(int i, int j){
	while(a[i].size() && b[j].size())
		ans[aa(i)] = bb(j);
}
int main()
{
	scanf("%d", &n);
	m = n - 1;
	for(int i = 0; i < m; i++){
		int v, u;
		scanf("%d%d", &v, &u);
		g[v].pb(u);
		g[u].pb(v);
	}
	dfs(1, 1);
	for(int i = 1; i <= n; i++)
		b[i % 3].pb(i);
	if(a[0].size() > a[1].size()){ //如果与1距离为偶的点的个数>与a的距离为奇数的点的个数 
		ff(0, 1); //与1偶数   模3为1 
	}else{
		ff(1, 1)；//与1奇数   模3为1
	}        
	if(a[0].size() > a[1].size()){
		ff(0, 2); //与1偶数   模3为2 
	}else{
		ff(1, 2); //与1奇数    模3为2 
	}        
	ff(0, 0);
	ff(1, 0);
	assert(a[0].empty());
	assert(a[1].empty());
	for(int i = 1; i <= n; i++)
		printf("%d ", ans[i]);
}            

Compiler output:
a.cc: In function 'int main()':
a.cc:56:25: error: expected ';' before '\U0000ff1b'
   56 |                 ff(1, 1)；//与1奇数   模3为1
      |                         ^~
      |                         ;
Language: Java

import java.util.Scanner;
public class Main {
  public static void main (String args[]) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int three = N/3;
    int tree[] = new int[N];
    int from, to;
    int ki, gu, both;
    ki = gu = both = 0;
    while(sc.hasNext()){
      from = sc.nextInt();
      to = sc.nextInt();
      if(tree[from-1]==2){
        if(tree[to-1]==0){
          tree[to-1] = 1;
          ki++;
        } else if(tree[to-1]==2){
          tree[to-1] = 3;
          ki--;
          both++;
        }
      } else if(tree[from-1]==1){
        if(tree[to-1]==0){
          tree[to-1] = 2;
          gu++;
        } else if(tree[to-1]==1){
          tree[to-1] = 3;
          gu--;
          both++;
        }
      } else if(tree[from-1]==0){
        tree[from-1]=2;
        gu++;
        if(tree[to-1]==0){
          tree[to-1] = 1;
          ki++;
        } else if(tree[to-1]==2){
          tree[to-1] = 3;
          ki--;
          both++;
        }
      } else {
        tree[to-1] = 3;
        both++;
      }
    }
    int ans[] = new int[N];
    boolean check[] = new boolean[N];
    int k, l, m;
    k = l = 0;
    m = 1;
    if(both>three){
      System.out.println(-1);
      return;
    }
    if(ki+both<three){
      for(int i=0;i<N;i++){
        if(tree[i]==1||tree[i]==3) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(gu+both<three){
      for(int i=0;i<N;i++){
        if(tree[i]==2||tree[i]==3) {
            ans[i]=3*m;
            check[ans[i]-1]=true;
            m++;
        }
      }
    }
    else if(three<ki&&three<gu){
      for(int i=0;i<N;i++){
        if(tree[i]==1&&k<three) {
          ans[i]=3*k+1;
          check[ans[i]-1]=true;
          k++;
        }
        else if(tree[i]==2&&l<three){
          ans[i]=3*l+2;
          check[ans[i]-1]=true;
          l++;
        }
      }
    }
    else 
    int c = 0;
    for(int i=0;i<N;i++){
      System.err.print(tree[i]);
      if(ans[i]!=0){
        System.out.print(ans[i]+" ");
      } else {
        while(check[c]){ 
          c++;
        }
        System.out.print((c+1)+" ");
        c++;
      }
    }
  }
}

Compiler output:
Main.java:90: error: variable declaration not allowed here
    int c = 0;
        ^
1 error