patternMinor
Attempt to write a function with cubed log runtime complexity $O(\log^3 n)$
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logwithruntimefunctionwriteattemptcubedcomplexity
Problem
I'm learning Data Structures and Algorithms now, I have a practical question that asked to write a function with O(log3n), which means log(n)log(n)log(n).
I have come with this solution, but it seems not correct. Please help me out.
public void run(int n) {
for (int i = 1; i < n; i *= 2) {
for (int j = 1; j < n; j *= 2) {
for (int k = 1; k < n; k *= 2) {
System.out.println("hi");
}
}
}
}I have come with this solution, but it seems not correct. Please help me out.
Solution
The following trivially is in the complexity class $O(\log^3 n)$:
But here is a solution with average and worst case of $O(\log^3 n)$:
public void run (int n) {
return;
}But here is a solution with average and worst case of $O(\log^3 n)$:
// O(log(n)), n = |orderedVals|
int findClosest (int needle, int[] orderedVals) {
// binary search for closest value and return it
}
// O(log(n)^3), n = |orderedVals|
int weirdSum (int initialNeedle, int[] orderedVals) {
int sum = 0;
int needle1 = initialNeedle;
int needle2 = findClosest(needle1, vals);
for (int i = 0; i < needle2; ++i) {
int needle3 = findClosest(needle2, vals);
for (int j = 0; i < needle3; ++j) {
sum += findClosest(needle2, vals);
}
}
return sum;
}Code Snippets
public void run (int n) {
return;
}// O(log(n)), n = |orderedVals|
int findClosest (int needle, int[] orderedVals) {
// binary search for closest value and return it
}
// O(log(n)^3), n = |orderedVals|
int weirdSum (int initialNeedle, int[] orderedVals) {
int sum = 0;
int needle1 = initialNeedle;
int needle2 = findClosest(needle1, vals);
for (int i = 0; i < needle2; ++i) {
int needle3 = findClosest(needle2, vals);
for (int j = 0; i < needle3; ++j) {
sum += findClosest(needle2, vals);
}
}
return sum;
}Context
StackExchange Computer Science Q#2411, answer score: 4
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