# C. Air Conditioner（区间交集）

Gildong owns a bulgogi restaurant. The restaurant has a lot of customers, so many of them like to make a reservation before visiting it.

Gildong tries so hard to satisfy the customers that he even memorized all customers' preferred temperature ranges! Looking through the reservation list, he wants to satisfy all customers by controlling the temperature of the restaurant.

The restaurant has an air conditioner that has 3 states: off, heating, and cooling. When it's off, the restaurant's temperature remains the same. When it's heating, the temperature increases by 1 in one minute. Lastly, when it's cooling, the temperature decreases by 1 in one minute. Gildong can change the state as many times as he wants, at any integer minutes. The air conditioner is off initially.

Each customer is characterized by three values:

A customer is satisfied if the temperature is within the preferred range at the instant they visit the restaurant. Formally, the

Given the initial temperature, the list of reserved customers' visit times and their preferred temperature ranges, you're going to help him find if it's possible to satisfy all customers.

Input

Each test contains one or more test cases. The first line contains the number of test cases

The first line of each test case contains two integers

Next,

The customers are given in non-decreasing order of their visit time, and the current time is

Output

For each test case, print "YES" if it is possible to satisfy all customers. Otherwise, print "NO".

You can print each letter in any case (upper or lower).

Example

input
Copy
4
3 0
5 1 2
7 3 5
10 -1 0
2 12
5 7 10
10 16 20
3 -100
100 0 0
100 -50 50
200 100 100
1 100
99 -100 0

output
Copy
YES
NO
YES
NO

Note

In the first case, Gildong can control the air conditioner to satisfy all customers in the following way:

• At
• At
• At
• At
• At
• At

In the third case, Gildong can change the state to heating at

In the second and the fourth case, Gildong has to make at least one customer unsatisfied.

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<utility>
#include<cstring>
#include<string>
#include<vector>
#include<stack>
#include<set>
#include<map>
#include<bitset>
#define inf 0x3f3f3f3f
using namespace std;
typedef long long LL;
typedef pair<int,int> pll;
const int maxn= 2e5+10;
const int mod =1e9+7;
const double EPS = 1e-6;
struct node
{
int ti;
int l;
int r;
};
node a;
bool cmp( node x, node y)
{
return x.ti<y.ti;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int t;
cin >> t;
while(t--)
{
int n,m;
cin >> n >> m;
for(int i=1;i<=n;i++)
{
cin >> a[i].ti >> a[i].l >> a[i].r;
}
sort(a+1,a+1+n,cmp);
LL x=m,y=m;
int time=0;
int flag=0;
for(int i=1;i<=n;i++)
{
int d=a[i].ti-time;
x-=d;
y+=d;
if(x<=a[i].r&&a[i].l<=y)//区间存在交集
{
if(x<a[i].l)
x=a[i].l;
if(y>a[i].r)
y=a[i].r;
time=a[i].ti;
}
else
{
flag=1;
break;
}
}
if(flag)
{
cout  << "NO" << endl;
}
else
{
cout << "YES" << endl;
}
}
return 0;
}

posted @ 2020-02-24 22:22  晴天要下雨  阅读(...)  评论(...编辑  收藏