Python编程题目答疑「Python一对一辅导考试真题解析」

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题目

题目链接：https://bornforthis.cn/blog/2023/12month/python-kaoshi.html

Solution

Question 1

# 读取输入
a = float(input("请输入实数 a: "))
b = float(input("请输入实数 b: "))
c = float(input("请输入实数 c: "))

# 计算和
sum = a + b + c

# 输出结果，保留两位小数
print(f"{sum:.2f}")

Question 2

class Add:
    def __init__(self):
        self.value = None

    def add(self, a, b):
        self.value = a + b


class AddInt(Add):
    def add(self, a, b):
        if isinstance(a, int) and isinstance(b, int):
            self.value = a + b


class AddN(Add):
    def __init__(self, n):
        super().__init__()
        self.n = n

    def add(self, a):
        self.value = self.n + a


a = Add()
a.add(2023, 1223)
print(a.value)

a = AddInt()
a.add(2023, 12.23)
print(a.value is None)

a = AddN(-1)
a.add(1)
print(a.value)

Question 3

class Vector:
    def __init__(self, values):
        # 如果values是单一的数字，将其转换为长度为1的列表
        if isinstance(values, (int, float)):
            values = [values]
        self.values = values

    def __str__(self):
        return str(self.values)

    def __len__(self):
        return len(self.values)

    def __add__(self, other):
        # 处理与实数的加法，将实数转换为长度为1的向量
        if isinstance(other, (int, float)):
            if len(self) != 1:
                raise ValueError("Cannot add scalar to Vector of length other than 1.")
            return Vector([self.values[0] + other])

        if isinstance(other, Vector):
            if len(self) != len(other):
                raise ValueError("Vectors are of different lengths.")
            return Vector([a + b for a, b in zip(self.values, other.values)])

        raise ValueError("Can only add Vector or scalar to Vector.")

    def __radd__(self, other):
        return self.__add__(other)

# 用于判题程序的交互部分
try:
    eval(input())
except ValueError:
    eval(input())


# print(len(Vector([])))
# print(5 + Vector([1, 2, 3, 4]))
# print("HelloWorld")

Question 4

def two_numbers_star(x, y):
    if x == 0 or y == 0:
        return 0
    if x % 2 == 0 and y % 2 == 0:
        return 2 * two_numbers_star(x // 2, y // 2)
    elif x % 2 == 1 and y % 2 == 1:
        return 2 * two_numbers_star((x - 1) // 2, (y - 1) // 2)
    elif x % 2 == 0 and y % 2 == 1:
        return 1 + 2 * two_numbers_star(x // 2, (y - 1) // 2)
    else:
        return two_numbers_star(y, x)

# 测试样例
x = 12
y = 23
result = two_numbers_star(x, y)
result

Question 5

def find_minimal_sum_revised(n, numbers):
    total_sum = sum(numbers)

    index_dict = {}

    min_value = float('inf')

    for i in range(n):

        pair_num = total_sum - numbers[i]

        if pair_num in index_dict and index_dict[pair_num] != i:
            current_value = i + 1 + (index_dict[pair_num] + 1) * (n + 1)

            min_value = min(min_value, current_value)

        if numbers[i] not in index_dict:
            index_dict[numbers[i]] = i

    return min_value if min_value != float('inf') else 0


n = 5
numbers = [15, -11, 2, 7, -4]
find_minimal_sum_revised(n, numbers)