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/*
 *  Created on: 18-October-2019
 *      Author: ankur314
 */
#include <bits/stdc++.h>
#define lli long long int
#define li long int
#define db double
#define ldb long double
#define vr vector
#define it iterator
#define fi(i,a,n) for(int i=a;i<n;i++)
#define fli(i,a,n) for(long int i=a;i<n;i++)
#define flli(i,a,n) for(long long int i=a;i<n;i++)
#define pb(n) push_back(n)
#define ppf() pop_front()
#define pii pair<int,int>
#define MOD 1000000007
 
#define debug1(x) cout<<x<<"\n"
#define debug2(x,y) cout<<x<<" "<<y<<"\n"
#define debug3(x,y,z) cout<<x<<" "<<y<<" "<<z<<"\n"
#define debug4(x,y,z,w) cout<<x<<" "<<y<<" "<<z<<" "<<w<<"\n"
 
using namespace std;
 
struct bag{
	int l, r, v;
};
 
bool comp(bag a, bag b)
{
	if(a.v != b.v)
	{
		return (a.v < b.v);
	}
	else
	{
		if(a.l != b.l)
		{
			return (a.l < b.l);
		}
		else
		{
			return (a.r < b.r);
		}
	}
}
 
int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    /*freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);*/
    int t; cin>>t;
    while(t--)
    {
    	int n; cin>>n;
    	bag a[n];
    	fi(i,0,n)
    	{
    		int l1, r1, v1;
    		cin>>l1>>r1>>v1;
    		a[i].l = l1;
    		a[i].r = r1;
    		a[i].v = v1;
    	}
    	sort(a, a+n, comp);
    	bool ok = true;
    	int prev1 = -1;
    	bag prev;
    	prev.l = -1;prev.r = -1;prev.v = -1;
    	fi(i,0,n-1)
    	{
    		if(a[i].v != prev1)
    		{
    			prev1 = a[i].v;
    			if(a[i+1].v != prev1)
    			{
    				continue;
    			}
    			prev.l = -1;prev.r = -1;prev.v = -1;
    			if(a[i].r >= a[i+1].l)
    			{
    				if(prev.l != -1)
    				{
    					if(prev.r >= a[i+1].l)
    					{
    						ok = false;
    						break;
    					}
    				}
    				prev = a[i];
    			}    			
    		}
    		else
    		{
    			prev1 = a[i].v;
    			if(a[i+1].v != prev1)
    			{
    				continue;
    			}
    			if(a[i].r >= a[i+1].l)
    			{
    				if(prev.l != -1)
    				{
    					if(prev.r >= a[i+1].l)
    					{
    						ok = false;
    						break;
    					}
    				}
    				prev = a[i];
    			}    			
    		}
    	}
    	if(ok)
    	{
    		cout<<"YES\n";
    	}
    	else
    	{
    		cout<<"NO\n";
    	}
    }
    return 0;
}

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Runtime error #stdin #stdout 0s 4320KB

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Standard input is empty

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