Class Solution
- java.lang.Object
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- g0901_1000.s0964_least_operators_to_express_number.Solution
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public class Solution extends Object
964 - Least Operators to Express Number.Hard
Given a single positive integer
x
, we will write an expression of the formx (op1) x (op2) x (op3) x ...
where each operatorop1
,op2
, etc. is either addition, subtraction, multiplication, or division (+
,-
,*
, or/)
. For example, withx = 3
, we might write3 * 3 / 3 + 3 - 3
which is a value of 3.When writing such an expression, we adhere to the following conventions:
- The division operator (
/
) returns rational numbers. - There are no parentheses placed anywhere.
- We use the usual order of operations: multiplication and division happen before addition and subtraction.
- It is not allowed to use the unary negation operator (
-
). For example, “x - x
” is a valid expression as it only uses subtraction, but “-x + x
” is not because it uses negation.
We would like to write an expression with the least number of operators such that the expression equals the given
target
. Return the least number of operators used.Example 1:
Input: x = 3, target = 19
Output: 5
Explanation: 3 * 3 + 3 * 3 + 3 / 3.
The expression contains 5 operations.
Example 2:
Input: x = 5, target = 501
Output: 8
Explanation: 5 * 5 * 5 * 5 - 5 * 5 * 5 + 5 / 5.
The expression contains 8 operations.
Example 3:
Input: x = 100, target = 100000000
Output: 3
Explanation: 100 * 100 * 100 * 100. The expression contains 3 operations.
Constraints:
2 <= x <= 100
1 <= target <= 2 * 108
- The division operator (
-
-
Constructor Summary
Constructors Constructor Description Solution()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
leastOpsExpressTarget(int x, int target)
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