3 Well-Solved Problems

3.1 Properties of Easy Problems

• In examining a problem to see if it has an efficient algorithm, the following four properties often go together:
  
  
• In the next sections, we examine several classes of problems for which we will see that typically all four properties hold.

3.2 IPs with Totally Unimodular Matrices

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来源： https://blog.csdn.net/z3w97/article/details/120809048