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Let Ti ( mj , N) the cost to solve a significant problem using the mj method. The average cost:
Tavg(N) = (1/n) * sum Ti (mj,N), i =1 to n The cost in the worst case: Tworst (N) = max Ti
(mj,N), i =1 to n The cost in the best case: Tbest (N) = min Ti (mj, N), i = 1 to n Obviously Tavg
(N) Tworst (N). Similarly, Tavg (N) Tbest (N). Is it possible that Tworst = O ( N^2 log N ) and
Tworst = (1) , Tavg = O(N^2) , Tavg = (log N) , Tbest = O ( N log N) and Tbest = ( N)? Give a
formal proof it's IMPOSSIBLE , or give Tworst , Tavg Tbest and FUNCTIONS that meet the
conditions. Thank you
Solution
A function T(N) is O(F(N)) if for some constant c and for all values of N greater than some value
n0:
T(N) <= c * F(N)
The idea is that T(N) is the exact complexity of a method or algorithm as a function of the
problem size N and that F(N) is an upper-bound on that complexity (i.e., the actual time/space or
whatever for a problem of size N will be no worse than F(N)). In practice, we want the smallest
F(N) -- the least upper bound on the actual complexity.
For example, consider T(N) = 3 * N2 + 5. We can show that T(N) is O(N2) by choosing c = 4
and n0 = 2. This is because for all values of N greater than 2:
3 * N2 + 5 <= 4 * N2
T(N) is not O(N) because whatever constant c and value n0 you choose, I can always find a
value of N greater than n0 so that 3 * N2 + 5 is greater than c * N.
Im not familiar with this concept so i cant give you the exact answer, i hope you understand and
im sorry.
Let Ti ( mj - N) the cost to solve a significant problem using the mj.docx

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Let Ti ( mj - N) the cost to solve a significant problem using the mj.docx

  • 1. Let Ti ( mj , N) the cost to solve a significant problem using the mj method. The average cost: Tavg(N) = (1/n) * sum Ti (mj,N), i =1 to n The cost in the worst case: Tworst (N) = max Ti (mj,N), i =1 to n The cost in the best case: Tbest (N) = min Ti (mj, N), i = 1 to n Obviously Tavg (N) Tworst (N). Similarly, Tavg (N) Tbest (N). Is it possible that Tworst = O ( N^2 log N ) and Tworst = (1) , Tavg = O(N^2) , Tavg = (log N) , Tbest = O ( N log N) and Tbest = ( N)? Give a formal proof it's IMPOSSIBLE , or give Tworst , Tavg Tbest and FUNCTIONS that meet the conditions. Thank you Solution A function T(N) is O(F(N)) if for some constant c and for all values of N greater than some value n0: T(N) <= c * F(N) The idea is that T(N) is the exact complexity of a method or algorithm as a function of the problem size N and that F(N) is an upper-bound on that complexity (i.e., the actual time/space or whatever for a problem of size N will be no worse than F(N)). In practice, we want the smallest F(N) -- the least upper bound on the actual complexity. For example, consider T(N) = 3 * N2 + 5. We can show that T(N) is O(N2) by choosing c = 4 and n0 = 2. This is because for all values of N greater than 2: 3 * N2 + 5 <= 4 * N2 T(N) is not O(N) because whatever constant c and value n0 you choose, I can always find a value of N greater than n0 so that 3 * N2 + 5 is greater than c * N. Im not familiar with this concept so i cant give you the exact answer, i hope you understand and im sorry.