[JAVA] [100%] FrogJmp (src & jUnit)

Painless

FrogJmp

Count the minimum number of jumps from position X to Y.

Task description

A little frog wants to go to the other side of the road. The frog is currently in position X and wants to reach a position above Y. The little frog always jumps a certain distance D.

Count the minimum number of jumps a small frog must make to reach its goal.

Write a function:

class Solution {public int solution（int X、int Y、int D）; }

It returns the minimum number of jumps from position X to positions above Y, given the three integers X, Y, and D.

For example:

   X = 10
   Y = 85
   D = 30

The function should return 3 because the frog is placed like this:

• Position 10 + 30 = 40 after the first jump
• Position 10 + 30 + 30 = 70 after the second jump
• After the third jump, position 10 + 30 + 30 + 30 = 100

Write a ** efficient ** algorithm for the following assumptions:

• X, Y, and D are integers in the range [1..1,000,000,000].
• X≤Y。

solve

Program FrogJmpSolution.java

FrogJmpSolution.java

    public int solution(int X, int Y, int D) {
        return (int) Math.ceil ((double) (Y - X) / D);
    }

Detected time complexity:
O(1)

jUnit FrogJmpSolutionTest.java

Report Candidate Report: trainingBFBAZF-EXF