# your code goes here
import random
 
def generate_question():
    while True:
        # 生成括号结构：如 (a ± b) ± (c ± d) 或 a ± (b ± c)
        structure = random.choice(["(a ± b) ± (c ± d)", "a ± (b ± c) ± d"])
        nums = [random.randint(1, 100) for _ in range(4)]
        a, b, c, d = sorted(nums, reverse=True)  # 控制数值大小避免负数
 
        # 随机运算符组合（仅加减）
        ops = [random.choice(["+", "-"]) for _ in range(3)]
        expr = structure.replace("a", str(a)).replace("b", str(b)).replace("c", str(c)).replace("d", str(d))
        expr = expr.replace("±", ops[0], 1).replace("±", ops[1], 1).replace("±", ops[2], 1)
 
        # 计算结果并验证范围
        try:
            result = eval(expr)
            if 0 <= result <= 100 and all(0 <= eval(part) <= 100 for part in expr.split("±")[::2]):
                return expr
        except:
            continue
 
# 生成500道题目
questions = [generate_question() for _ in range(500)]

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