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Walking Boy

Interview

Time limit2sMemory limit1024 MB

Summary
Given the minutes when messages were sent, decide whether two non-overlapping 120-minute walks fit in the gaps, with walks allowed to touch messages.
Level

Easy3 of 10

Topics
Greedy, Implementation
Solved
No attempts yet

Problem

One of the SWERC judges has a dog named Boy. Besides being a good competitive programmer, Boy loves fresh air, so she wants to be walked at least twice a day. Walking Boy requires 120120 consecutive minutes. Two walks cannot overlap, but one can start as soon as the previous one has finished. Boy before and after getting ACCEPTED on this problem. Today, the judge sent nn messages to the SWERC Discord server. The ii-th message was sent aia_i minutes after midnight. You know that, when walking Boy, the judge does not send any messages, but he can send a message right before or right after a walk. Is it possible that the judge walked Boy at least twice today? A day has 14401440 minutes, and a walk is considered to happen today if it starts at a minute s≥0s \ge 0 and ends right before a minute e≤1440e \le 1440. In that case, it must hold that e−s=120e - s = 120 and, for every i=1,2,…,ni = 1, 2, \dots, n, either ai≤sa_i \le s or ai≥ea_i \ge e.

Input

The first line contains an integer tt (1≤t≤1001 \le t \le 100), the number of test cases. The descriptions of the tt test cases follow. The first line of each test case contains an integer nn (1≤n≤1001 \le n \le 100), the number of messages sent by the judge. The second line of each test case contains nn integers a1,a2,…,ana_1, a_2, \dots, a_n (0≤a1<a2<⋯<an<14400 \le a_1 < a_2 < \cdots < a_n < 1440), the times at which the messages were sent, in minutes elapsed from midnight.

Output

For each test case, output one line containing YES if Boy could have been walked at least twice, and NO otherwise.

Hint

In the first test case, the judge sent a message at each time that is a multiple of 100, excluding 0. Boy could not have been walked even once. In the second test case, the times are the same as above, but 500 and 1000 are missing. The judge could have walked Boy, for instance, during the time intervals [440,560][440, 560] and [980,1100][980, 1100]. The situation is illustrated in the picture below, where the walks are represented by green intervals. In the third test case, the times are the same as in the first test case, but 1000 is missing. The judge could have walked Boy at most once. In the fourth test case, Boy could have been walked during the time intervals [739,859][739, 859] and [859,979][859, 979].

Examples1

  1. Example 1

    Input
    6
    14
    100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
    12
    100 200 300 400 600 700 800 900 1100 1200 1300 1400
    13
    100 200 300 400 500 600 700 800 900 1100 1200 1300 1400
    13
    101 189 272 356 463 563 659 739 979 1071 1170 1274 1358
    1
    42
    5
    0 1 2 3 4
    
    Expected output
    NO
    YES
    NO
    YES
    YES
    YES