输入字符串，输出字符串中出现次数最多的字母及其出现次数，如果有多个字母出现次数一样，按字符从小到大顺序输出字母及其出现次数

可以使用哈希表来记录每个字母出现的次数，然后遍历哈希表找到出现次数最多的字母及其出现次数。如果有多个字母出现次数一样，可以将哈希表按键值（即字母）从小到大排序后输出。

以下是 Python 代码实现：

def max_occurrence(s):
    # 构建哈希表记录每个字母出现的次数
    count = {}
    for c in s:
        count[c] = count.get(c, 0) + 1

    # 找到出现次数最多的字母及其出现次数
    max_count = 0
    max_chars = []
    for c in count:
        if count[c] > max_count:
            max_count = count[c]
            max_chars = [c]
        elif count[c] == max_count:
            max_chars.append(c)

    # 对出现次数一样的字母按字符从小到大排序
    max_chars.sort()

    # 返回结果
    return max_chars[0], max_count

测试：

s = 'hello world'
print(max_occurrence(s))  # ('l', 3)

s = 'abcbcdcde'
print(max_occurrence(s))  # ('c', 3)