The first line contains two integers: a positive integer n (0
第一行包含两个数：一个正整数n（0
Through the schema, a validating parser can verify that the element InvoiceNo is a positive integer and the element ProductID consists of one letter between A and Z followed by six digits.
通过模式，验证解析器可以检查元素InvoiceNo 是否是正整数，元素ProductID 的首字符是否为A到 Z之间的字母，后面为六个阿拉伯数字。
Given a positive integer, output its complement number.
给定一个正整数，输出其补数。
Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.
如果该对象小于指定对象返回负数，等于返回0，大于返回正数。
Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target.
给定一个无重复的正整数数组，计算得到一个目标正整数的所有可能组合方式的个数。
Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
比较用来排序的两个参数。根据第一个参数小于、等于或大于第二个参数分别返回负整数、零或正整数。
Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
比较用来排序的两个参数。根据第一个参数小于、等于或大于第二个参数分别返回负整数、零或正整数。
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