Branch and bound algorithm, Data Structure & Algorithms

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Suppose we have a set of N agents and a set of N tasks.Each agent can only perform exactly one task and there is a cost associated with each assignment. We would like to find out an assignment which results in the least total cost. Your task is to write a c++ program to implement the branch and bound algorithm to solve this assignment problem.

Your program should read input data from a input file named "infile.txt". The format for the input file is as follows: First line is an integer N representing the number of agents and the number of jobs. In the next N lines, each line j (1 ≤ j ≤ N) consists of N integers representing the cost of assigning agent j to each of the N tasks.

Figure 1 gives you an example of the input format. For example, the cost of assigning agent 1 to task 1, 2, 3 and 4 are 11, 12, 18 and 40 respectively.

4

11 12 18 40

14 15 13 22

11 17 19 23

17 14 20 28

Figure 1

Total cost: 61
(1,1)
(2,3)
(3,4)
 (4,2)

Figure 2

Output, to standard output, will consist of:

  • Total cost of the assignment
  • In the next N lines, each line j (1 ≤ j ≤ N) shows the task assignment for agent j in the format "(j,k)", which means agent j is assigned to task k.

Figure 2 gives you an example of the output screen for the input file in Figure 1.


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