Answer:
As specific information is mentioned in the question, we will solve the given assignment problem by following the steps of the Hungarian Method of Task (Job) Assignment as mentioned below:
We are given the following problem-table:
Where A to E = Workers and 1 to 5 = Jobs
As per the condition given in the question, Job 4 can not be assigned to Worker A, so, we have assigned M (i.e., a very high cost, say, 99999)
Step 1: Pick a minimum element from each row and subtract it from that row:
Step 2: Now, find out each column minimum element and subtract it from that column:
Hence, we get the following opportunity cost table:
Step 3: Make the assignments by following the below-mentioned substeps:
a. Identify rows with exactly one
unmarked 0. Make an assignment to this single 0 by making a square
( [0] ) around it and cross off all other 0 in the same
column.
b. Identify columns with exactly one unmarked 0. Make an assignment
to this single 0 by making a square ( [0] ) around it and cross off
all other 0 in the same rows.
c. If a row and/or column has two or more unmarked 0 and one cannot
be chosen by inspection, then choose the cell arbitrarily.
d. Continue this process until all 0 in rows/columns are either
assigned or cross off( ).
Thus,
(1) Rowwise cell (1,A) is assigned,
so columnwise cell (2,A),(3,A),(5,A) crossed off.
(2) Rowwise cell (2,B) is assigned, so columnwise cell (4,B)
crossed off.
(3) Columnwise cell (4,C) is assigned, so rowwise cell (4,D),(4,E)
crossed off.
Here, Number of assignments = 3,
number of rows = 5
Which is not equal, so solution is not optimal.
Step 4: Draw a set of horizontal and vertical lines to cover all the '0s' by following the substeps as mentioned below:
a. Tick(✓) mark all the rows in
which no assigned 0.
b. Examine Tick(✓) marked rows, If any 0 cell occurs in that row,
then tick(✓) mark that column.
c. Examine Tick(✓) marked columns, If any assigned 0 exists in that
columns, then tick(✓) mark that row.
d. Repeat this process until no more rows or columns can be
marked.
e. Draw a straight line for each unmarked rows and marked
columns.
Thus,
(1) Mark(✓) row 3 since it has no
assignment
(2) Mark(✓) row 5 since it has no assignment
(3) Mark(✓) column A since row 3 has 0 in this column
(4) Mark(✓) row 1 since column A has an assignment in this row
1.
(5) Since no other rows or columns can be marked, therefore draw
straight lines through the unmarked rows 2,4 and marked columns
A
Hence, we get:
Step 5:
Develop the new revised table by
selecting the smallest element, among the cells not covered by any
line (say k = 1)
Subtract k = 1 from every element in the cell not covered by a
line.
Add k = 1 to every element in the intersection cell of two
lines.
Step 6: Here, make the assignments by following step 3:
(1) Rowwise cell (1,A) is assigned,
so columnwise cell (3,A),(5,A) crossed off.
(2) Rowwise cell (2,B) is assigned, so columnwise cell (4,B)
crossed off.
(3) Rowwise cell (3,C) is assigned, so columnwise cell (4,C)
crossed off.
(4) Rowwise cell (5,E) is assigned, so columnwise cell (4,E)
crossed off.
(5) Rowwise cell (4,D) is assigned
Hence, we get:
Here, Number of assignments = 5,
number of rows = 5
Which is equal, so the solution is optimal
Hence, the optimal solution=
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