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

#include<cstdio>
#include<algorithm>
#include<stack>
#define st first
#define nd second

using namespace std;
struct O{
		int st;
		int nd;
		int val;
};
const int N = 2e3 + 10;

int dp[N][N],   a[3 * N], fr[N] , ba[N];

int main()
{
	int n;
	scanf("%d", &n);
	for(int i = 1; i <= 3 * n; i++) {
		scanf("%d", &a[i]);
	}
	dp[a[1]][a[2]] = dp[a[2]][a[1]] = ba[a[2]] = ba[a[1]] = fr[a[2]] = fr[a[1]] =1;
	int col = 0, ma = 1;
	for(int i = 3; i < 3 *  n; i += 3){
		if(a[i] == a[i + 1] && a[i] == a[i + 2]) {
			col ++;
			continue;
		}
		sort(a + i, a + i + 3);
		stack<O> stx;
		if(a[i + 1] == a[i + 2]){
			swap(a[i], a[i + 2]);	
		}	    
		if(a[i] == a[i + 1]){
			for(int j = 1; j <= n; j++){
				if(dp[a[i]][j] != 0) stx.push({ a[i + 2], j, dp[a[i]][j] + 1});
				if(dp[j][a[i]] != 0) stx.push({j, a[i + 2], dp[j][a[i]] + 1});
			}
			stx.push({a[i], a[i], ma});			
		}
		else{
			int x = max(ma, dp[a[i]][a[i]] + 1), y = max(ma, dp[a[i + 1]][a[ i +1]] + 1), z = max(ma, dp[a[i + 2]][a[i+2]] + 1);
			stx.push({a[i + 1], a[i + 2], x}), stx.push({a[i], a[i +2], y}), stx.push({a[i], a[i + 1], z});
			stx.push({a[i + 2], a[i + 1], x), stx.push({a[i + 2], a[i], y}), stx.push({a[i + 1], a[i], z});
			for(int j = 1; j <= n; j++){
				for(int k = 0; k < 3; k++){
					if(fr[j] !=  0) stx.push({j, a[i + k], fr[j]});
					if(ba[j] != 0)  stx.push({a[i + k], j, ba[j]});
				}
			}
		}
		while(!stx.empty()){
			int x = stx.top().st, y = stx.top().nd, z= stx.top().val;
			stx.pop();
			dp[x][y] = max(dp[x][y], z);
			fr[x] = max(fr[x], z);
			ba[y] = max(ba[y],  z);
			ma = max(ma, z);
		}	
	}
	printf("%d", col +  max(ma, dp[a[3 *n]][a[3 * n]] + 1) - 1);
}		

Compiler output:
a.cc: In function 'int main()':
a.cc:46:56: error: expected '}' before ')' token
   46 |                         stx.push({a[i + 2], a[i + 1], x), stx.push({a[i + 2], a[i], y}), stx.push({a[i + 1], a[i], z});
      |                                  ~                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 6005;
const int INF = 1e5;
int A[MAXN], nxt[MAXN], dp[MAXN][MAXN], ans = 0, base = 0, N;
inline int Cost(int a, int b, int c) { return A[a] == A[b] && A[b] == A[c]; }
void chmax(int &x, int val) { x = max(x, val); }
inline void Transition(int i, int j, int cur) {
  if (cur > 3 * N) return;
  if (cur == 3 * N)
    return void(chmax(ans, dp[i][j] + Cost(i, j, cur)));
  for (int u = 1; u <= 3; ++u)
    for (int v = u + 1; v <= 3; ++v)
      chmax(dp[cur + u - 1][cur + v - 1], dp[i][j] + Cost(i, j, cur + (u ^ v) - 1));
  for (int c : {i, j}) {
    chmax(dp[c][cur + 0], dp[i][j] + Cost(i ^ j ^ c, cur + 1, cur + 2));
    chmax(dp[c][cur + 1], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 2));
    chmax(dp[c][cur + 2], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 1));
  }
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
  cin >> N;
  for (int i = 1; i <= 3 * N; i++) {
    cin >> A[i];
    if (i % 3 == 2 && i >= 5 && Cost(i, i - 1, i - 2)) i -= 3, --N, ++base;
  }
  vector<int> last(3 * N + 1, 3 * N + 1);
  for (int i = 3 * N; i > 0; i--) nxt[i] = last[A[i]], last[A[i]] = i; 
  for (int i = 0; i < MAXN; i++)
    for (int j = 0; j < MAXN; j++)
      dp[i][j] = -INF;
  dp[1][2] = 0;
  for (int i = 1; i <= 3 * N; i++) {
    for (int j = i + 1; j <= 3 * N; j++) {
      Transition(i, j, (j + 3) / 3 * 3);
      int u = i / 3 * 3 < nxt[i] / 3 * 3 ? nxt[i] / 3 * 3 : 6 * n;
      int v = j / 3 * 3 < nxt[j] / 3 * 3 ? nxt[j] / 3 * 3 : 6 * n;
      Transition(i, j, min(u, v));
    }
  }
  cout << ans + base << "\n";
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:65: error: 'n' was not declared in this scope
   38 |       int u = i / 3 * 3 < nxt[i] / 3 * 3 ? nxt[i] / 3 * 3 : 6 * n;
      |                                                                 ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 6005;
const int INF = 1e5;
int A[MAXN], nxt[MAXN], dp[MAXN][MAXN], ans = 0, base = 0, N;
inline int Cost(int a, int b, int c) { return A[a] == A[b] && A[b] == A[c]; }
void chmax(int &x, int val) { x = max(x, val); }
inline void Transition(int i, int j, int cur) {
  if (cur > 3 * N) return;
  if (cur == 3 * N)
    return void(chmax(ans, dp[i][j] + Cost(i, j, cur)));
  for (int u = 1; u <= 3; ++u)
    for (int v = u + 1; v <= 3; ++v)
      chmax(dp[cur + u - 1][cur + v - 1], dp[i][j] + Cost(i, j, (u ^ v) - 1));
  for (int c : {i, j}) {
    chmax(dp[c][cur + 0], dp[i][j] + Cost(i ^ j ^ c, cur + 1, cur + 2));
    chmax(dp[c][cur + 1], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 2));
    chmax(dp[c][cur + 2], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 1));
  }
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
  cin >> N;
  for (int i = 1; i <= 3 * N; i++) {
    cin >> A[i];
    if (i % 3 = 2 && i >= 5 && Cost(i, i - 1, i - 2)) i -= 3, --N;
  }
  vector<int> last(3 * N + 1, 3 * N + 1);
  for (int i = 3 * N; i > 0; i--) nxt[i] = last[A[i]], last[A[i]] = i; 
  for (int i = 0; i < MAXN; i++)
    for (int j = 0; j < MAXN; j++)
      dp[i][j] = -INF;
  dp[1][2] = 0;
  for (int i = 1; i <= 3 * N; i++) {
    for (int j = i + 1; j <= 3 * N; j++) {
      Transition(i, j, (j + 3) / 3 * 3);
      if (j / 3 * 3 < nxt[i] / 3 * 3)
        Transition(i, j, nxt[i] / 3 * 3);
      if (j / 3 * 3 < nxt[j] / 3 * 3)
        Transition(i, j, nxt[j] / 3 * 3);
    }
  }
  cout << ans + base << "\n";
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:11: error: lvalue required as left operand of assignment
   27 |     if (i % 3 = 2 && i >= 5 && Cost(i, i - 1, i - 2)) i -= 3, --N;
      |         ~~^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
const int MAXN = 6005;
const int INF = 1e5;
int A[MAXN], nxt[MAXN], dp[MAXN][MAXN], ans = 0, base = 0, N;
inline int Cost(int a, int b, int c) {
  return A[a] == A[b] && A[b] == A[c];
}
int chmax(int &x, int val) {
  x = max(x, val);
}
inline void Transition(int i, int j, int cur) {
  if (cur > 3 * N) return;
  if (cur == 3 * N) {
    chmax(ans, dp[i][j] + Cost(i, j, cur))   
    return;
  }
  for (int u = 1; u <= 3; ++u)
    for (int v = u + 1; v <= 3; ++v)
      chmax(dp[cur + u - 1][cur + v - 1], dp[i][j] + Cost(i, j, (u ^ v) - 1));
 
  for (int c : {i, j}) {
    chmax(dp[c][cur + 0], dp[i][j] + Cost(i ^ j ^ c, cur + 1, cur + 2));
    chmax(dp[c][cur + 1], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 2));
    chmax(dp[c][cur + 2], dp[i][j] + Cost(i ^ j ^ c, cur + 0, cur + 1));
  }
}
 
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
 
  cin >> N;
  for (int i = 1; i <= 3 * N; i++) {
    cin >> A[i];
  }
 
  while (true) {
    bool change = false;
    for (int i = 3; i + 2 <= 3 * N; i += 3) {
      if (A[i] == A[i + 1] && A[i + 1] == A[i + 2]) {
        base += 1;
        for (int j = i + 3; j <= 3 * N; j++) {
          A[j - 3] = A[j];
        }
        N -= 1;
        change = true;
        break;
      }
    }
    if (!change) {
      break;
    }
  }
  
  vector<int> last(3 * N + 1, 3 * N + 1);
  for (int i = 3 * N; i > 0; i--) {
    nxt[i] = last[A[i]];
    last[A[i]] = i;
  }
  for (int i = 0; i < MAXN; i++) {
    for (int j = 0; j < MAXN; j++) {
      dp[i][j] = -INF;
    }
  }
  dp[1][2] = 0;
  for (int i = 1; i <= 3 * N; i++) {
    for (int j = i + 1; j <= 3 * N; j++) {
      Transition(i, j, (j + 3) / 3 * 3);
      // Find next occurrence of A[i]
      if (j / 3 * 3 < nxt[i] / 3 * 3) {
        Transition(i, j, nxt[i] / 3 * 3);
      }
      if (j / 3 * 3 < nxt[j] / 3 * 3) {
        Transition(i, j, nxt[j] / 3 * 3);
      }
    }
  }
 
  cout << ans + base << "\n";
  return 0;
}

Compiler output:
a.cc: In function 'int chmax(int&, int)':
a.cc:12:1: warning: no return statement in function returning non-void [-Wreturn-type]
   12 | }
      | ^
a.cc: In function 'void Transition(int, int, int)':
a.cc:16:43: error: expected ';' before 'return'
   16 |     chmax(ans, dp[i][j] + Cost(i, j, cur))
      |                                           ^
      |                                           ;
   17 |     return;
      |     ~~~~~~
Language: C++

#include<cstdio>
#include<algorithm>
using namespace std;
const int maxn=2005;
int a[3*maxn],maxx[maxn][maxn];
int main()
{
    int n;
    scanf("%d",&n);
    for(int i=1;i<=3*n;i++)
        scanf("%d",&a[i]);
    memset(maxx,-1,sizeof(maxx));
    maxx[min(a[1],a[2])][max(a[1],a[2])]=0;
    int add=0;
    for(int i=1;i<n;i++)
    {
        int u=a[i*3],v=a[i*3+1],w=a[i*3+2];
        int x=min(u,min(v,w)),y=max(min(u,max(v,w)),min(v,w)),z=max(u,max(v,w));
        if(x==y&&y==z) add++;
        else if(x==y||y==z)
        {
            int m=y,n=x+y+z-2*m;
            x=y=m; z=n;
            for(int nxt=1;nxt<=n;nxt++)
            {
                int pre=maxx[min(x,nxt)][max(x,nxt)];
                if(pre==-1) continue;
                int &now=maxx[min(z,nxt)][max(z,nxt)];
                now=max(now,pre+1);
            }
            int pre=maxx[z][z];
            if(pre!=-1)
            {
                int &now=maxx[x][y];
                now=max(now,pre+1);
            }
        }
        else
        {
            int &now1=maxx[x][y];
            if(maxx[z][z]!=-1)
                now1=max(now1,maxx[z][z]+1);
            int &now2=maxx[x][z];
            if(maxx[y][y]!=-1)
                now2=max(now2,maxx[y][y]+1);
            int &now3=maxx[y][z];
            if(maxx[x][x]!=-1)
                now3=max(now3,maxx[x][x]+1);
        }
    }
    int ans=0;
    for(int i=1;i<=n;i++)
        for(int j=i;j<=n;j++)
            if(maxx[i][j]!=-1)
                ans=max(ans,maxx[i][j]+(i==a[3*n]&&j==a[3*n]));
    printf("%d\n",ans+add);
    return 0;
}
/*
2
1 2 1 2 2 1
 
3
1 1 2 2 3 3 3 2 1
 
3
1 1 2 2 2 3 3 3 1
 */


Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'memset' was not declared in this scope
   12 |     memset(maxx,-1,sizeof(maxx));
      |     ^~~~~~
a.cc:3:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<algorithm>
  +++ |+#include <cstring>
    3 | using namespace std;
Language: Java

import java.util.Arrays;
import java.util.Scanner;
import java.util.Vector;

/**
 * sp86
 */

public class Sp86 {
    
    static int[][]arr=new int[2001][2001];
    static int[]arr2=new int[2001];
    static int[]ar=new int[6001];
    static int cn;
    public static void main(String[] args) {
        for(int i=0;i<2001;i++)
            Arrays.fill(arr[i],-1);
        int ak,aj;
        ak=aj=0;
        Scanner sc= new Scanner(System.in);
        cn=sc.nextInt();
        for(int i=1;i<=3*cn;i++)ar[i]=sc.nextInt();
        arr[ar[1]][ar[2]]=0;
        arr[ar[2]][ar[1]]=0;
        arr2[ar[1]]=0;
        arr2[ar[2]]=0;
        
        for(int i=1;i<cn;i++){
            Vector<Tasd> ts =new Vector<Tasd>();
            int[]ar2=new int[4];
            for(int j=0;j<3;j++)ar2[j+1]=ar[3*i+j];
            if(ar2[1]==ar2[2]&&ar2[2]==ar2[3]){ak++;continue;}
            for(int j=0;j<3;j++){
                if(ar2[(j+1)%3+1]==ar2[(j+2)%3+1]){
                    int k=ar2[(j+1)%3+1];
                    for(int t=1;t<=cn;t++){
                        if(arr[k][t]==-1)continue;
                        Tasd z=new Tasd();
                        z.x=ar2[j+1];
                        z.y=t;
                        z.num=arr[k][t]+1;
                        ts.add(z);


                    }
                }
                if(arr[ar2[j+1]][ar2[j+1]]!=-1){
                    Tasd z=new Tasd();
                    z.x=ar2[(j+1)%3+1];
                    z.y=ar2[(j+2)%3+1];
                    z.num=arr[ar2[j+1]][ar2[j+1]]+1;
                    ts.add(z);
                }
                for(int t=1;t<=cn;t++){
                    if(arr2[t]==-1)continue;
                    Tasd z=new Tasd();
                    z.x=t;
                    z.y=ar2[j+1];
                    z.num=arr2[t];
                    ts.add(z);

                    
                }
                Tasd z=new Tasd();
                z.x=ar2[(j+1)%3+1];
                z.y=ar2[(j+2)%3+1];
                z.num=aj;
                ts.add(z);
            }
            for(Tasd z:ts){
               // System.out.println(z.x+" "+z.y+" "+z.num);
                aj=Math.max(aj,z.num);
                arr[z.x][z.y]=Math.max(arr[z.x][z.y],z.num);
                arr[z.y][z.x]=Math.max(arr[z.y][z.x],z.num);
                arr2[z.x]=Math.max(arr2[z.x],z.num);
                arr2[z.y]=Math.max(arr2[z.y],z.num);
            }
        }
        aj=Math.max(aj,arr[ar[3*cn]][ar[3*cn]]+1);
        int ans=ak+aj;
        System.out.println(ans);

    }
}

class Tasd {
    public int x,y,num;

    
}


Compiler output:
Main.java:9: error: class Sp86 is public, should be declared in a file named Sp86.java
public class Sp86 {
       ^
1 error
Language: Java

import java.util.Arrays;
import java.util.Scanner;
import java.util.Vector;

/**
 * sp86
 */


public class Sp86 {
    
    static int[][]arr=new int[2001][2001];
    static int[]arr2=new int[2001];
    static int[]ar=new int[6001];
    static int cn;
    public static void main(String[] args) {
        for(int i=0;i<2001;i++)
            Arrays.fill(arr[i],-1);
        int ak,aj;
        ak=aj=0;
        Scanner sc= new Scanner(System.in);
        cn=sc.nextInt();
        for(int i=1;i<=3*cn;i++)ar[i]=sc.nextInt();
        arr[ar[1]][ar[2]]=0;
        arr[ar[2]][ar[1]]=0;
        arr2[ar[1]]=0;
        arr2[ar[2]]=0;
        
        for(int i=1;i<cn;i++){
            Vector<Tasd> ts =new Vector<Tasd>();
            int[]ar2=new int[4];
            for(int j=0;j<3;j++)ar2[j+1]=ar[3*i+j];
            if(ar2[1]==ar2[2]&&ar2[2]==ar2[3]){ak++;continue;}
            for(int j=0;j<3;j++){
                if(ar2[(j+1)%3+1]==ar2[(j+2)%3+1]){
                    int k=ar2[(j+1)%3+1];
                    for(int t=1;t<=cn;t++){
                        if(arr[k][t]==-1)continue;
                        Tasd z=new Tasd();
                        z.x=ar2[j+1];
                        z.y=t;
                        z.num=arr[k][t]+1;
                        ts.add(z);


                    }
                }
                if(arr[ar2[j+1]][ar2[j+1]]!=-1){
                    Tasd z=new Tasd();
                    z.x=ar2[(j+1)%3+1];
                    z.y=ar2[(j+2)%3+1];
                    z.num=arr[ar2[j+1]][ar2[j+1]]+1;
                    ts.add(z);
                }
                for(int t=1;t<=cn;t++){
                    if(arr2[t]==-1)continue;
                    Tasd z=new Tasd();
                    z.x=t;
                    z.y=ar2[j+1];
                    z.num=arr2[t];
                    ts.add(z);

                    
                }
                Tasd z=new Tasd();
                z.x=ar2[(j+1)%3+1];
                z.y=ar2[(j+2)%3+1];
                z.num=aj;
                ts.add(z);
            }
            for(Tasd z:ts){
               // System.out.println(z.x+" "+z.y+" "+z.num);
                aj=Math.max(aj,z.num);
                arr[z.x][z.y]=Math.max(arr[z.x][z.y],z.num);
                arr[z.y][z.x]=Math.max(arr[z.y][z.x],z.num);
                arr2[z.x]=Math.max(arr2[z.x],z.num);
                arr2[z.y]=Math.max(arr2[z.y],z.num);
            }
        }
        aj=Math.max(aj,arr[ar[3*cn]][ar[3*cn]]+1);
        int ans=ak+aj;
        System.out.println(ans);

    }
}
class Tasd {
    public int x,y,num;

    
}


Compiler output:
Main.java:10: error: class Sp86 is public, should be declared in a file named Sp86.java
public class Sp86 {
       ^
1 error
Language: Java

import java.util.Arrays;
import java.util.Scanner;
import java.util.Vector;

/**
 * sp86
 */

class Tasd {
    public int x,y,num;

    
}

public class sp86 {
    
    static int[][]arr=new int[2001][2001];
    static int[]arr2=new int[2001];
    static int[]ar=new int[6001];
    static int cn;
    public static void main(String[] args) {
        for(int i=0;i<2001;i++)
            Arrays.fill(arr[i],-1);
        int ak,aj;
        ak=aj=0;
        Scanner sc= new Scanner(System.in);
        cn=sc.nextInt();
        for(int i=1;i<=3*cn;i++)ar[i]=sc.nextInt();
        arr[ar[1]][ar[2]]=0;
        arr[ar[2]][ar[1]]=0;
        arr2[ar[1]]=0;
        arr2[ar[2]]=0;
        
        for(int i=1;i<cn;i++){
            Vector<Tasd> ts =new Vector<Tasd>();
            int[]ar2=new int[4];
            for(int j=0;j<3;j++)ar2[j+1]=ar[3*i+j];
            if(ar2[1]==ar2[2]&&ar2[2]==ar2[3]){ak++;continue;}
            for(int j=0;j<3;j++){
                if(ar2[(j+1)%3+1]==ar2[(j+2)%3+1]){
                    int k=ar2[(j+1)%3+1];
                    for(int t=1;t<=cn;t++){
                        if(arr[k][t]==-1)continue;
                        Tasd z=new Tasd();
                        z.x=ar2[j+1];
                        z.y=t;
                        z.num=arr[k][t]+1;
                        ts.add(z);


                    }
                }
                if(arr[ar2[j+1]][ar2[j+1]]!=-1){
                    Tasd z=new Tasd();
                    z.x=ar2[(j+1)%3+1];
                    z.y=ar2[(j+2)%3+1];
                    z.num=arr[ar2[j+1]][ar2[j+1]]+1;
                    ts.add(z);
                }
                for(int t=1;t<=cn;t++){
                    if(arr2[t]==-1)continue;
                    Tasd z=new Tasd();
                    z.x=t;
                    z.y=ar2[j+1];
                    z.num=arr2[t];
                    ts.add(z);

                    
                }
                Tasd z=new Tasd();
                z.x=ar2[(j+1)%3+1];
                z.y=ar2[(j+2)%3+1];
                z.num=aj;
                ts.add(z);
            }
            for(Tasd z:ts){
               // System.out.println(z.x+" "+z.y+" "+z.num);
                aj=Math.max(aj,z.num);
                arr[z.x][z.y]=Math.max(arr[z.x][z.y],z.num);
                arr[z.y][z.x]=Math.max(arr[z.y][z.x],z.num);
                arr2[z.x]=Math.max(arr2[z.x],z.num);
                arr2[z.y]=Math.max(arr2[z.y],z.num);
            }
        }
        aj=Math.max(aj,arr[ar[3*cn]][ar[3*cn]]+1);
        int ans=ak+aj;
        System.out.println(ans);

    }
}

Compiler output:
Main.java:15: error: class sp86 is public, should be declared in a file named sp86.java
public class sp86 {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
int n,dp[2003][2003],a[6003],ans,tg,MX[2003],cur;
vector<int>A,B,C;
void add(int x,int y,int z){A.push_back(x),B.push_back(y),C.push_back(z);}
int main(){
	cin>>n;
	for(int i=1;i<=3*n;i++)cin>>a[i]; 
	memset(dp,-1,sizeof(dp));
	memset(MX,-1,sizeof(MX));
	dp[a[1]][a[2]]=dp[a[2]][a[1]]=MX[a[1]]=MX[a[2]]=cur=0;
	for(int i=3;i<3*n;i+=3){
		A.clear(),B.clear(),C.clear();
		if(a[i]==a[i+1]&&a[i]==a[i+2]){tg++;continue;}
		sort(a+i,a+i+2);
		if(a[i]==a[i+1])for(int j=1;j<=n;j++)if(dp[j][a[i]]>=0)add(j,a[i+2],dp[j][a[i]]+1);
		if(a[i+1]==a[i+2])for(int j=1;j<=n;j++)if(dp[j][a[i+1]]>=0)add(j,a[i],dp[j][a[i+1]]+1);
		if(dp[a[i]][a[i]]>=0)add(a[i+1],a[i+2],dp[a[i]][a[i]]+1);
		if(dp[a[i+1]][a[i+1]]>=0)add(a[i],a[i+2],dp[a[i+1]][a[i+1]]+1);
		if(dp[a[i+2]][a[i+2]]>=0)add(a[i],a[i+1],dp[a[i+2]][a[i+2]]+1);
		add(a[i],a[i+1],cur),add(a[i+1],a[i+2],cur),add(a[i],a[i+2],cur);
		for(int j=i;j<i+3;j++)for(int k=1;k<=n;k++)if(MX[k]>=0)add(a[j],k,MX[k]);
		for(int j=0;j<(int)A.size();j++)if(dp[A[j]][B[j]]<C[j])
			dp[A[j]][B[j]]=dp[B[j]][A[j]]=C[j],MX[A[j]]=max(MX[A[j]],C[j]),MX[B[j]]=max(MX[B[j]],C[j]),cur=max(cur,C[j]);
	}
	for(int i=1;i<=n;i++){
		for(int j+1=1;j<=n;j++)if(dp[i][j]>=0)ans=max(ans,dp[i][j]);
		if(dp[i][i]>=0)ans=max(ans,dp[i][i]+1);
	}
	printf("%d",ans+tg);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:26: error: expected ';' before '+' token
   27 |                 for(int j+1=1;j<=n;j++)if(dp[i][j]>=0)ans=max(ans,dp[i][j]);
      |                          ^
      |                          ;
a.cc:27:26: error: lvalue required as left operand of assignment
   27 |                 for(int j+1=1;j<=n;j++)if(dp[i][j]>=0)ans=max(ans,dp[i][j]);
      |                          ^~
a.cc:27:35: error: expected ')' before ';' token
   27 |                 for(int j+1=1;j<=n;j++)if(dp[i][j]>=0)ans=max(ans,dp[i][j]);
      |                    ~              ^
      |                                   )
a.cc:27:36: error: 'j' was not declared in this scope
   27 |                 for(int j+1=1;j<=n;j++)if(dp[i][j]>=0)ans=max(ans,dp[i][j]);
      |                                    ^
Language: C++


#include <bits/stdc++.h>
using namespace std;
const int inf = 2e3+9,MX = 1e9+9;
int n,a[3*inf],dp[inf*3][inf*3],Ans,Total;
int Last[inf],Next[inf];
vector<int> Group;

//we only start in positions like 3,6,9 and we have 2 left elements
int NearestStart(int x){
    return x/3 *3;
}

int CostGroupExcept(int Left1,int Left2){

    set<int> s;
    for(auto o:Group)
        if(o != Left1 && o != Left2)
            s.insert( a[o] );
    return (s.size() == 1);
}

void Transitions(int Left1,int Left2,int Cur){
    // we have a[Left1] and a[Left2] from the last group of 3 we processed
    // and the current group is a[Cur] , a[Cur+1] , a[Cur+2]
    Group = {Left1,Left2,Cur,Cur+1,Cur+2};

    if(Cur > 3*n)
        return;

    if(Cur == 3*n)
        return void( Ans = max( Ans , dp[Left1][Left2] + CostGroupExcept(Cur+1,Cur+2) ) );

    for(int i = 0; i < 5; i++){
        for(int j=1; j < 5 ; j++){
            int NextLeft1 = Group[i];
            int NextLeft2 = Group[j];
            dp[ NextLeft1 ][ NextLeft2 ] = max( dp[ NextLeft1 ][ NextLeft2 ]
                                               , dp[Left1][Left2] + CostGroupExcept(NextLeft1,NextLeft2) );
        }
    }
}

int main(){


    scanf("%d",&n);
    for(int i=1;i<=3*n;i++)
        scanf("%d",a+i);

    bool Change = 1;
    while(Change){
        Change = 0;
        for(int i=3;i +2 <=3*n;i+=3){
            if(!(a[i] == a[i+1] && a[i] == a[i+2]))
                break;

                Change = 1;
                Total++;
                for(int j=i+3;j <= 3*n;j++)
                    a[j-3] = a[j];
                n--;
                break;
        }
    }
    for(int i=1;i<=n;i++)
        last[i] = 3*n;

    for(int i=3*n;i>=1;i--)
        Next[ i ] = Last[ a[i] ],
        Last[ a[i] ] = i;

    for(int i=0;i<3*inf;i++)
        for(int j=0;j<3*inf;j++)
            dp[i][j] = -MX;
    dp[1][2] = 0;

    for(int i=1;i<=3*n;i++){
        for(int j=i+1;j<=3*n;j++){
            // we choose j+3 so we guarantee that NearestStart(j) < NearestStart(j+3);
            Transitions( i , j , NearestStart( j+3 ) );
            // we look for the Next occurrence a[i]
            if( NearestStart(j) < NearestStart( Next[i] ) )
                Transitions( i , j , NearestStart ( Next[i] ) );
            // we look for the Next occurrence a[j]
            if( NearestStart(j) < NearestStart( Next[j] ) )
                Transitions( i , j , NearestStart ( Next[j] ) );
        }
    }
    printf("%d\n",Ans+Total);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:67:9: error: 'last' was not declared in this scope; did you mean 'Last'?
   67 |         last[i] = 3*n;
      |         ^~~~
      |         Last
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  int n;
  cin >> n;
  int t = 3*n;
  int arr[t];
  for(int i=0;i<t;i++)
  {
    cin >> arr[i];
  }
  sort(arr,arr+n,greater<int>());
  bool flag = false;
  int point=0;
  for(int i=0;i<2;i++)
  {
    if(arr[i]==arr[i+1])
      flag = true;
  }
  if(flag==true)
  {
    arr.erase(arr[0]);
    arr.erase(arr[1]);
    arr.erase(arr[2]);
    point++;
  }
  else
  {
    arr.erase(arr[0]);
    arr.erase(arr[1]);
    arr.erase(arr[2]);
  }
  cout << point << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   24 |     arr.erase(arr[0]);
      |         ^~~~~
a.cc:25:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   25 |     arr.erase(arr[1]);
      |         ^~~~~
a.cc:26:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   26 |     arr.erase(arr[2]);
      |         ^~~~~
a.cc:31:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   31 |     arr.erase(arr[0]);
      |         ^~~~~
a.cc:32:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   32 |     arr.erase(arr[1]);
      |         ^~~~~
a.cc:33:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   33 |     arr.erase(arr[2]);
      |         ^~~~~
Language: C++

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

int main()
{
  int n;
  cin >> n;
  int t = 3*n;
  int arr[t];
  for(int i=0;i<n;i++)
  {
    cin >> arr[i];
  }
  sort(arr,arr+n,greater<int>());
  bool flag = false;
  int point=0;
  for(int i=0;i<2;i++)
  {
    if(arr[i]==arr[i+1])
      flag = true;
  }
  if(flag==true)
  {
    arr.erase(arr.begin());
    arr.erase(arr.begin()+1);
    arr.erase(arr.begin()+2);
    point++;
  }
  else
  {
    arr.erase(arr.begin());
    arr.erase(arr.begin()+1);
    arr.erase(arr.begin()+2);
  }
  cout << point << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   24 |     arr.erase(arr.begin());
      |         ^~~~~
a.cc:24:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   24 |     arr.erase(arr.begin());
      |                   ^~~~~
a.cc:25:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   25 |     arr.erase(arr.begin()+1);
      |         ^~~~~
a.cc:25:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   25 |     arr.erase(arr.begin()+1);
      |                   ^~~~~
a.cc:26:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   26 |     arr.erase(arr.begin()+2);
      |         ^~~~~
a.cc:26:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   26 |     arr.erase(arr.begin()+2);
      |                   ^~~~~
a.cc:31:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   31 |     arr.erase(arr.begin());
      |         ^~~~~
a.cc:31:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   31 |     arr.erase(arr.begin());
      |                   ^~~~~
a.cc:32:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   32 |     arr.erase(arr.begin()+1);
      |         ^~~~~
a.cc:32:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   32 |     arr.erase(arr.begin()+1);
      |                   ^~~~~
a.cc:33:9: error: request for member 'erase' in 'arr', which is of non-class type 'int [t]'
   33 |     arr.erase(arr.begin()+2);
      |         ^~~~~
a.cc:33:19: error: request for member 'begin' in 'arr', which is of non-class type 'int [t]'
   33 |     arr.erase(arr.begin()+2);
      |                   ^~~~~
Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long ll;

typedef long double ld;
typedef pair<ll,ll> pp;
typedef tree<pp,null_type,less<pp>,rb_tree_tag,tree_order_statistics_node_update> super_set;

#define x1 dfds
#define y1 dsfdsfe
#define pb push_back
#define forn(i,n) for(ll i = 1;i<=n;++i)
#define fi first
#define sc second
#define endl '\n'
#define po(x) (1ll<<x)
#define log sdfdsfdsf

const ll DIM = 2E3+7;
const ll MOD = 1e9+7;
const ll M1 = 1e9+7;
const ll INF = 1E17;
const ld eps = 0.00000000000001;
const ld PI = 3.14159265358979323846;
int getInt(int a = 0, int b = INT_MAX){
	static mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	return uniform_int_distribution <int> (a, b)(rng);
}
ll A[DIM*3],dp[DIM][DIM],rmax[DIM];
struct node{
    ll fi,sc,th;
};
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll n;
    cin>>n;
    forn(i,n*3)cin>>A[i];

    forn(i,n){
        forn(j,n)dp[i][j] = -INF;
        rmax[i] = -INF;
    }
    dp[A[1]][A[2]] = dp[A[2]][A[1]] = 0;
    rmax[A[1]] = rmax[A[2]] = 0;
    ll num = 0,mx = 0;
    for(ll i = 3;i<=n*3;i+=3){
        if (A[i]==A[i+1] && A[i]==A[i+2]){
            ++num;
            continue;
        }
        vector<node> V;
        forn(perm,3){
            swap(A[i],A[i+1]);
            swap(A[i+1],A[i+2]);
            V.pb({A[i+1],A[i],dp[A[i+2]][A[i+2]]+1});
            V.pb({A[i],A[i+1],dp[A[i+2]][A[i+2]]+1});

            forn(j,n){
                if (A[i+1]==A[i+2]){
                    V.pb({A[i],j,dp[A[i+2]][j]+1});
                    V.pb({j,A[i],dp[A[i+2]][j]+1});
                }
                V.pb({j,A[i+2],rmax[j]});
                V.pb({A[i+2],j,rmax[j]});
                V.pb({A[i+2],j,rmax[A[i+2]});
                V.pb({j,A[i+2],rmax[A[i+2]]});

            }

        }
        for(node to:V){
            dp[to.fi][to.sc] = max(dp[to.fi][to.sc],to.th);
            mx = max(mx,dp[to.fi][to.sc]);
            rmax[to.fi] = max(rmax[to.fi],dp[to.fi][to.sc]);
            rmax[to.sc] = max(rmax[to.sc],dp[to.fi][to.sc]);
        }
    }
    cout<<mx+num<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:68:43: error: expected ']' before '}' token
   68 |                 V.pb({A[i+2],j,rmax[A[i+2]});
      |                                           ^
      |                                           ]
Language: C++

#include<bits/stdc++.h>
using namespace std;
int const nax = 2048;
const int INF = 1e7;
int n;
int a[nax * 3];
int f[nax][nax];
int local_max[nax];
tuple <int, int, int> to_update[nax * 16]; /// never go more than this
/// it's O(n) but cannot tell exactly how large, should be no more than this
int top_update = 0;

void add_update (int x, int y, int z) {
    to_update[++ top_update] = make_tuple(x, y, z);
}


void shift_array (int *b) {
    static int tmp[3];
    for (int i = 0 ; i < 3; ++ i)
        tmp[i] = b[i];
    b[0] = tmp[1], b[1] = tmp[2], b[2] = tmp[0];
}

int main() {

    scanf("%d", &n);
    for (int i = 1; i <= 3 * n; ++ i)
        scanf("%d", a + i);
    for (int i = 0 ; i <= n + 10 ; ++ i)
    for (int j = 0 ; j <= n + 10; ++ j)
        f[i][j] = -INF;
    for (int i = 0 ; i <= n + 10 ; ++ i)
        local_max[i] = -INF;
    f[a[1]][a[2]] = f[a[2]][a[1]] = 0;
    local_max[a[1]] = local_max[a[2]] = 0;

    int to_add = 0;
    int ans = 0;


    for (int cur = 3 ; cur < 3 * n ; cur += 3) {
        if (a[cur + 1] == a[cur] && a[cur] == a[cur + 2]) {
            to_add += 1;
            continue;
        }

        static int b[3];
        b[0] = a[cur], b[1] = a[cur + 1], b[2] = a[cur + 2];

        for (int i = 0 ; i < 3 ; ++ i)
        for (int j = i + 1 ; j < 3 ; ++ j) {
            int k = 3 - i - j;
            add_update(b[i], b[j], ans);
            add_update(b[i], b[j], f[b[k]][b[k]] + 1);
        }

        for (int shift = 0; shift < 3 ; ++ shift) {
            shift_array(b);
            int x = b[0], y = b[1], z = b[2];
            for (int t = 1 ; t <= n ; ++ t) {
                if (y == z) {

                    add_update(x, t, f[t][y] + 1);
                }
                /// add new state
              //  add_update(y, z, f[x][x] + 1);
                add_update(x, t, local[x]);
            }
        }

        for (int i = 1 ; i <= top_update ; ++ i) {
            const auto &[x, y, z] = to_update[i];
            ans = max(ans, z);
            local_max[x] = max(local_max[x], z);
            local_max[y] = max(local_max[y], z);
            f[x][y] = max(f[x][y], z);
            f[y][x] = max(f[y][x], z);

        }
        top_update = 0;
    }


    ans = max(ans, f[a[3 * n]][a[3 * n]] + 1);
    printf("%d\n", ans + to_add);
}



Compiler output:
a.cc: In function 'int main()':
a.cc:68:34: error: 'local' was not declared in this scope
   68 |                 add_update(x, t, local[x]);
      |                                  ^~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int N=6006;
int n,ans,u,a[N];
multiset<int>s[2];
multiset<int>::iterator it;
bool cou(int u,int x)
{
    return s[u].size()&&s[u].count(x);
}
bool cou2(int u,int x)
{
    if(s[u].size()<=1||!s[u].count(x)) return false;
    s[u].erase(s[u].find(x));
    bool ans=s[u].count(x);
    s[u].insert(x);
    return ans;
}
vector<int>v;
void sol2()
{
    int sum=0,pos=-1;
    for(int i=0;i<v.size();i++)
        if(cou2(u,v[i]))
        sum++,pos=i;
    ans+=sum>=1;
    if(sum>=1)
    {
        s[u].clear();s[u^1].clear();
        for(int i=0;i<v.size();i++)
            if(pos!=i) s[u].insert(v[i]);
    }
    else
    {
        for(int i=0;i<v.size();i++)
            s[u].insert(v[i]);
    }
}
void sol1()
{
    if(v[1]==v[2]) swap(v[0],v[2]);
    if(cou(u^1,v[0])&&cou(u,v[0]))
    {
        ans++;
        s[u^1].erase(s.find(v[0]));
        s[u].insert(v[2]);
    }
    else if(cou(u^1,v[0]))
    {
        ans++;
        s[u^1].clear();
        s[u].insert(v[2]);
    }
    else if(cou(u,v[0]))
    {
        ans++;
        s[u].erase(s[u].find(v[0]));
        for(it=s[u].begin();it!=s[u].end();it++)
            s[u^1].insert(*it);
        s[u].clear();
        s[u].insert(v[2]);
    }
    else sol2();
}
void sol()
{
    for(int i=6;i<=n*3;i+=3)
        if(i==n*3)
        {
            if(cou(u,a[i])&&cou(u^1,a[i])) ans++;
            else if(cou2(u,a[i])) ans++;
        }
        else
        {
            v.clear();
            v.push_back(a[i]);
            v.push_back(a[i+1]);
            v.push_back(a[i+2]);
            sort(v.begin(),v.end());
            if(v[0]==v[1]&&v[1]==v[2]) ans++;
            else if(v[0]==v[1]||v[1]==v[2]) sol1();
            else sol2();
        }
}
int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n*3;i++)
        scanf("%d",&a[i]);
    if(n==1)
    {
        printf("%d\n",a[1]==a[2]&&a[2]==a[3]);
        return 0;
    }
    vector<int>v;
    for(int i=1;i<=5;i++)
        v.push_back(a[i]);
    sort(v.begin(),v.end());
    bool vis[6];memset(vis,false,sizeof(vis));
    for(int i=0;i<=2;i++)
        if(v[i]==v[i+1]&&v[i+1]==v[i+2])
    {
        vis[i]=vis[i+1]=vis[i+2]=true;
        break;
    }
    for(int i=0;i<v.size();i++)
        if(!vis[i]) s[u].insert(v[i]);
    ans+=s[u].size()==2;
    sol();
    printf("%d\n",ans);
}


Compiler output:
a.cc: In function 'void sol1()':
a.cc:45:24: error: request for member 'find' in 's', which is of non-class type 'std::multiset<int> [2]'
   45 |         s[u^1].erase(s.find(v[0]));
      |                        ^~~~
Language: Java

#include<stdio.h>
#include<stdlib.h>
int main()
{
	int n;
	scanf("%d",&n);
	int i,sum=0,a[n];
	for(i=0;i<3*n;i++)
	scanf("%d",&a[i]);
	for(i=0;i<n;i++)
	{
		int j,x,y,z;
		for(j=i;j<5;j++)
		{
			if(a[j]<a[j+1])
			{
				int temp=a[j];
				a[j]=a[j+1];
				a[j+1]=temp;
			}
		}
		//for(j=i;j<5;j++)
		//printf("%d ",a[j]);
		//printf("\n");
		x=a[i];
		y=a[i+1];
		z=a[i+2];
		for(j=0;j<3*n;j++)
		{
			a[i]=a[i+3];
		}
		if(x==y&&x==z)
		sum++;
		//printf("%d\n",sum);
	}
	printf("%d",sum);
}



Compiler output:
Main.java:1: error: illegal character: '#'
#include<stdio.h>
^
Main.java:1: error: class, interface, enum, or record expected
#include<stdio.h>
        ^
Main.java:2: error: illegal character: '#'
#include<stdlib.h>
^
Main.java:6: error: class, interface, enum, or record expected
	scanf("%d",&n);
	^
Main.java:7: error: class, interface, enum, or record expected
	int i,sum=0,a[n];
	^
Main.java:8: error: class, interface, enum, or record expected
	for(i=0;i<3*n;i++)
	^
Main.java:8: error: class, interface, enum, or record expected
	for(i=0;i<3*n;i++)
	        ^
Main.java:8: error: class, interface, enum, or record expected
	for(i=0;i<3*n;i++)
	              ^
Main.java:10: error: class, interface, enum, or record expected
	for(i=0;i<n;i++)
	^
Main.java:10: error: class, interface, enum, or record expected
	for(i=0;i<n;i++)
	        ^
Main.java:10: error: class, interface, enum, or record expected
	for(i=0;i<n;i++)
	            ^
Main.java:13: error: class, interface, enum, or record expected
		for(j=i;j<5;j++)
		^
Main.java:13: error: class, interface, enum, or record expected
		for(j=i;j<5;j++)
		        ^
Main.java:13: error: class, interface, enum, or record expected
		for(j=i;j<5;j++)
		            ^
Main.java:18: error: class, interface, enum, or record expected
				a[j]=a[j+1];
				^
Main.java:19: error: class, interface, enum, or record expected
				a[j+1]=temp;
				^
Main.java:20: error: class, interface, enum, or record expected
			}
			^
Main.java:26: error: class, interface, enum, or record expected
		y=a[i+1];
		^
Main.java:27: error: class, interface, enum, or record expected
		z=a[i+2];
		^
Main.java:28: error: class, interface, enum, or record expected
		for(j=0;j<3*n;j++)
		^
Main.java:28: error: class, interface, enum, or record expected
		for(j=0;j<3*n;j++)
		        ^
Main.java:28: error: class, interface, enum, or record expected
		for(j=0;j<3*n;j++)
		              ^
Main.java:31: error: class, interface, enum, or record expected
		}
		^
Main.java:35: error: class, interface, enum, or record expected
	}
	^
Main.java:37: error: class, interface, enum, or record expected
}
^
25 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

struct RNG {
  ll l, r;
  bool operator<(const RNG& a) const {
    return r < a.r;
  }
};
class MaxRange {
public:
  ll max_range;
  set<RNG> rngs;

  MaxRange():max_range(0){}

  void add(const RNG& rng){
    ll nl = rng.l, nr = rng.r;

    auto bgn = rngs.lower_bound((RNG){nl-1,nl-1});
    auto it = bgn;
    for(; it != rngs.end(); it++){
      if(it->l <= rng.r+1){
        nl = min(nl, it->l);
        nr = max(nr, it->r);
      }else{
        break;
      }
    }

    rngs.erase(bgn, it);
    rngs.insert((RNG){nl,nr});
    max_range = max(max_range, nr+1-nl);
  }

  ll get_max(){
    return max_range;
  }
};

int main(){
  int N;
  cin >> N;
  vector<int> v;
  rep(i,3*N){
    int a;
    cin >> a;
    v.push_back(a);
  }
  v.push_back(-1);
  v.push_back(-1);

  ll ret = 0;
  vector<int> w;
  for(int i=0; i<v.size(); i+=5){
    if(v[i+2] == v[i+3] && v[i+3] == v[i+4]){
      w.push_back(v[i]);
      w.push_back(v[i+1]);
      ret++;
    }else{
      rep(j,5){
        w.push_back(v[i+j]);
      }
    }
  }

  MaxRange maxrange;

  REP(i,1,N+1){
    int mn=w.size(), mx = -1;
    rep(j,w.size()){
      if(w[j] == i){
        mn = min(mn, j/3);
        mx = max(mx, j/3);
      }
    }
    maxrange.add((RNG){(ll)mn,(ll)mx-1});
  }

  ret += maxrange.mrngs.size();

  cout << ret << endl;
  
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:86:19: error: 'class MaxRange' has no member named 'mrngs'; did you mean 'rngs'?
   86 |   ret += maxrange.mrngs.size();
      |                   ^~~~~
      |                   rngs
Language: C++

#include <cstdio>
#include <algorithm>

using namespace std;


int N;
int A[6005];
int dp[2][2005][2005];

int main(){
    scanf("%d",&N);
    for(int i=1;i<=3*N;i++) scanf("%d",A+i);


    int ans=0;
    for(int i=0;i<N;i++){
        auto limit=3*(i+1);
        for(int j=1;j<limit;j++){
            for(int k=j+1;k<limit;k++){

                if (i==N-1){
                    if (A[3*N]==A[j]&&A[j]==A[k) {
                        
                        ans=max(ans,dp[i%2][j][k]+1);
                    }
                    continue;
                }

                int indices[5]={j,k,limit,limit+1,limit+2};

                for(int a=0;a<5;a++){
                    for(int b=a+1;b<5;b++){
                        auto rfst=indices[a],rsnd=indices[b];
                        bool eq=true;
                        for(int s=0;s<4;s++){
                            if (s==a||b==s) continue;
                            int n=s+1;
                            while(n<5&&(n==a||n==b)) n++;
                            if (n>=5) break;
                            eq=eq&&(A[indices[s]]==A[indices[n]]);
                        }
                        dp[(i+1)%2][rfst][rsnd]=dp[i%2][j][k]+(eq?1:0);
                        ans=max(ans,dp[(i+1)%2][rfst][rsnd]);
                    }
                }

            }
        }

    }

    // if (A[3*N]==A[3*N-1]&&A[3*N-1]==A[3*N-2]) ans++;

    printf("%d\n",ans);



    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:48: error: expected ']' before ')' token
   23 |                     if (A[3*N]==A[j]&&A[j]==A[k) {
      |                                                ^
      |                                                ]
Language: C++

/*                                  /   \                                                                   (Hello)//JSM//*/      
/*                                 /*****\                                                                              */
/*     Jai Shree Mataji           /       \ |\| |_| $ |-| K                                                            */
#include<vector>
#include<iostream>
#include<algorithm>                
#include<string.h>                 
#include<bits/stdc++.h>            
#include<cstring>                  
#include<map>                     
#include<cmath>                  
#include<set>
using namespace std;            
#define ll long long int        
#define ld long double
#define MOD 1000000007 
#define PI 3.1415926535897932384626433832795                                               
#define YY cout<<"YES"
#define NN cout<<"NO"
#define EE cout<<"\n"
#define ee cout<<"\n"
#define ne cout<<"-1"
#define pb push_back 
#define fi first
#define se second
#define mkp make_pair    
#define mkt make_tuple
#define sall(v ) sort(v.begin(), v.end())      
#define all(v )  v.begin(), v.end()      
#define rall(v )  reverse(v.begin(), v.end())      
#define fo(i , n) for(ll i = 0 ; i < n ; i++)
#define vl vector<ll>
#define vll vector< pair<ll,ll> > 
#define mpl map<ll, ll>
#define pr pair<ll,ll>
#define tpl tuple<ll,ll,ll>
bool sortbysec(const pair<int,int> &a,const pair<int,int> &b) {return (a.second < b.second); }
ll soltn(ll x, ll n) {if(x>=0) return x%n;    else return n+x%n;}
ll pd(ll x,ll y){if(x%y==0) return x/y;else return x/y+1;}
ll coda(ll n,ll d){ll count=0;while(n!=0){if(n%10==d)count++;n/=10;}return count;}
ll pow1(ll n,ll p){if(p==0)return 1;ll x=pow1(n, p/2);x=(x*x)%MOD;if(p%2==0) return x;else return (x*n)%MOD;}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);	
	  ll t=1;
      
      
//	   cin>>t;
	      while(t--)
{
//jai shree mataji
/*
3
1 1 2 2 2 3 3 3 1*/
ll n,m,j,k,l,i;
cin>>n;
ll a[3*n];
fo(i,3*n)
{
	cin>>a[i];
}
mpl M;
ll ans=0;
ll j=0;
for(i=0;i<3*n;i+=5)
{
	//j++;
	M[a[i]]++;
	M[a[i+1]]++;
	M[a[i+2]]++;
	M[a[i+3]]++;
	M[a[i+4]]++;
	ll f=-1;
	for(j=0;j<5;j++)
	if(M[a[i+j]]>=3)
	{
		ans+=1;
		M[a[i+j]]-=3;
		f=1;
		break;
	}
	if(i>=5&&f==-1)
	{
	M[a[i-1]]--;
	M[a[i-2]]--;
	M[a[i-3]]--;
	M[a[i-4]]--;
	M[a[i-5]]--;
	}
}
cout<<ans;
ee;
}
return 0;
}














Compiler output:
a.cc: In function 'int main()':
a.cc:64:4: error: redeclaration of 'long long int j'
   64 | ll j=0;
      |    ^
a.cc:55:8: note: 'long long int j' previously declared here
   55 | ll n,m,j,k,l,i;
      |        ^
Language: C++

#include<iostream>
using namespace std;
typedef long long ll;
int main() {
	int n;
	cin>>n;
	
	map<int,int> c;
	int ans = 0;
	for(int i=0;i<6*n;++i){
		int ii;
		cin>>ii;
		c[ii]++;
	}
	for(int i=0;i<n;++i){
		ans+= c[i]/3;
	}
	cout<<ans;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'map' was not declared in this scope
    8 |         map<int,int> c;
      |         ^~~
a.cc:2:1: note: 'std::map' is defined in header '<map>'; this is probably fixable by adding '#include <map>'
    1 | #include<iostream>
  +++ |+#include <map>
    2 | using namespace std;
a.cc:8:13: error: expected primary-expression before 'int'
    8 |         map<int,int> c;
      |             ^~~
a.cc:13:17: error: 'c' was not declared in this scope
   13 |                 c[ii]++;
      |                 ^
a.cc:16:23: error: 'c' was not declared in this scope
   16 |                 ans+= c[i]/3;
      |                       ^
Language: C

//要素の削除（無視）の方法調べる

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll inf =2e3+9;
int n,a[inf<<2],cur[inf],ans;

int main(){
    cin>>n;
    for(int i=1;i<=3*n;i++)
        cin>>a[i];

    cur[ a[1] ]++,cur[ a[2] ]++;

    for(int i=3;i<=3*n;i+=3){
        for(int j=i;j<i+3;j++)
            cur[ a[j] ]++;
        bool done =0,tmp[n+2]={0},last[n+2] = {0};

        for(int z=1;z<=n;z++)
            if( cur[z] > 2)
                cur[z] -= 3,ans++,done = 1;
        if(done)
            continue;
        for(int z= i+3;z<=n;z++){
            if(cur[ a[z] ] == 0)
                continue;
            if(tmp[ a[z] ] + cur[ a[z] ] < 3)
                tmp[ a[z] ]++,last[ a[z] ] = z;
        }
        vector<pair<int,int> > v;
        v.clear();
        for(int z = 1;z<=n;z++){
            if(cur[z] == 0)
                continue;
            if(tmp[z] + cur[z] == 3)
                v.push_back( make_pair( last[z],z ) );
            else
                v.push_back( make_pair(n+1,z) );
        }
        sort(v.begin(),v.end());
        int del = 0;
        for(int z = v.size()-1;z>=0;z--){
            while(del < 3 && cur[ v[z].second ])
                del++,cur[ v[z].second ]--;
        }
    }
    cur[ a[3*n] ]++;
            for(int z=1;z<=n;z++)
            if( cur[z] > 2)
                cur[z] -= 3,ans++;
    cout<<ans<<endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:28:27: error: use of an operand of type 'bool' in 'operator++' is forbidden in C++17
   28 |                 tmp[ a[z] ]++,last[ a[z] ] = z;
      |                 ~~~~~~~~~~^
Language: C++

#include<iostream>
#include<vector>
#include<assert>

int main() {
  int n;
  std::cin >> n;
  std::vector<int> c(n, 0);
  for (int i = 0; i != 3 * n; ++i) {
    int a;
    std::cin >> a;
    ++c[--a];
  }
  for (int x : c) {
    assert(x == 3);
  }
}


Compiler output:
a.cc:3:9: fatal error: assert: No such file or directory
    3 | #include<assert>
      |         ^~~~~~~~
compilation terminated.
Language: C++

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

#define                                 ff                                          first
#define                                 ss                                          second
#define                                 pai                                         acos(-1)
#define                                 ll                                          long long


const ll mod  = 1e9 +07;
const ll mxn  = 1e6 +10;

int  main()
{
    ll i,j,k,a,b,c,d,n,m,t,h,u,v,x,y,z;
    string s;
    cin>>s;
    if(s[0]=='R'&&(s[0]==s[1]&&s[1]==s[2]))
    {
        cout<<3<<endl;
    }
    else if(s[1]=='R'&&(s[0]==s[1]||s[1]==s[2]))
    {
        cout<<2<<endl;
    }
    else if(count(all(s),'R')>0)
    {
        cout<<1<<endl;
    }
    else
    {
        cout<<0<<endl;
    }
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:26:19: error: 'all' was not declared in this scope; did you mean 'std::filesystem::perms::all'?
   26 |     else if(count(all(s),'R')>0)
      |                   ^~~
      |                   std::filesystem::perms::all
In file included from /usr/include/c++/14/filesystem:51,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:200,
                 from a.cc:1:
/usr/include/c++/14/bits/fs_fwd.h:158:7: note: 'std::filesystem::perms::all' declared here
  158 |       all               =  0777,
      |       ^~~