Package g0901_1000.s0991_broken_calculator

Class Solution

java.lang.Object
g0901_1000.s0991_broken_calculator.Solution
public class Solution extends Object
991 - Broken Calculator.

Medium

There is a broken calculator that has the integer startValue on its display initially. In one operation, you can:

  • multiply the number on display by 2, or
  • subtract 1 from the number on display.

Given two integers startValue and target, return the minimum number of operations needed to display target on the calculator.

Example 1:

Input: startValue = 2, target = 3

Output: 2

Explanation: Use double operation and then decrement operation {2 -> 4 -> 3}.

Example 2:

Input: startValue = 5, target = 8

Output: 2

Explanation: Use decrement and then double {5 -> 4 -> 8}.

Example 3:

Input: startValue = 3, target = 10

Output: 3

Explanation: Use double, decrement and double {3 -> 6 -> 5 -> 10}.

Constraints:

  • 1 <= x, y <= 109

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • brokenCalc

      public int brokenCalc(int startValue, int target)