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22164_C(n,m)again

2022-5-16 18:21| 发布者: Hocassian| 查看: 22| 评论: 0|原作者: 肇庆学院ACM合集

摘要:

C:\Users\Administrator\Downloads\2019-10-12-10-14-5-89506165552200-Problem List-采集的数据-后羿采集器.html

Pro.ID

22164

Title

C(n, m) again

Title链接

http://10.20.2.8/oj/exercise/problem?problem_id=22164

AC

Submit

Ratio

0.00%

时间&空间限制

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)

描述

This is a classical problem. Your job is to calculate the combination formula , since n, m and C(n, m) fit a 64-bit unsigned integer.

输入

The first line of input there is one integer T ( T ≤ 100 ), giving the number of test cases in the input. Each test case contains a line with two integer n and m ( 0 ≤ m ≤ n < 2⁶⁴ ).

输出

Description

This is a classical problem. Your job is to calculate the combination formula , since n, m and C(n, m) fit a 64-bit unsigned integer.

Input

The first line of input there is one integer T ( T ≤ 100 ), giving the number of test cases in the input. Each test case contains a line with two integer n and m ( 0 ≤ m ≤ n < 2⁶⁴ ).