Python题解（需要三重循环）

T = int(input()) 
 
for _ in range(T): 
    N = int(input()) 
    numbers = list(map(int, input().split())) 
    has_arithmetic = False 
 
    for i in range(N): 
        for j in range(i + 1, N): 
            for k in range(j + 1, N): 
                ai = numbers[i] 
                aj = numbers[j] 
                ak = numbers[k] 
                if ai - aj == aj - ak: 
                    has_arithmetic = True 
                    break 
            if has_arithmetic: 
                break 
        if has_arithmetic: 
            break 
 
    if has_arithmetic: 
        print("Yes") 
    else: 
        print("No")