1400D - Zigzags - CodeForces Solution

import os,sys
from random import randint, shuffle
from io import BytesIO, IOBase

from collections import defaultdict,deque,Counter
from bisect import bisect_left,bisect_right
from heapq import heappush,heappop, heapify
from functools import lru_cache, reduce
from itertools import accumulate, permutations
import math, copy

sys.setrecursionlimit(2*10**5+5)

BUFSIZE = 8192
class FastIO(IOBase):
    newlines = 0
    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None
    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()
    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()
    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")

MOD = 998244353  



def main():
    def solve():
        n = int(input())
        arr = list(map(int, input().split()))
        cc = Counter()
        ans = 0
        for i in range(n):
            delta = 0
            for j in range(i+1,n):
                if arr[i] == arr[j]:
                    ans += delta 
                delta += cc[arr[j]]
            cc[arr[i]] += 1
        print(ans)
        return  

        


            t = int(input())
        for i in range(t):
                solve() 
                                                

    

if __name__ == "__main__":
    main()