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代码说明：

  整数规划，分支定界法，实现1000变量（变量个数可自行设定），只需改变原始数据，就能运行！是比较好的分支分支定界法程序设计(Integer programming, branch and bound method to achieve the 1000 variables (number of variables can be set on their own), simply by changing the original data, you can run! Branch is a better programming branch and bound method )