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‎Algorithms/0964.least-operators-to-express-number/README.md

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# [964. Least Operators to Express Number](https://leetcode.com/problems/least-operators-to-express-number/)
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Given a single positive integer `x`, we will write an expression of the form `x (op1) x (op2) x (op3) x ...` where each operator `op1`, `op2`, etc. is either addition, subtraction, multiplication, or division `(+, -, *, or /)`. For example, with `x = 3`, we might write `3 * 3 / 3 + 3 - 3` which is a value of 3.
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When writing such an expression, we adhere to the following conventions:
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1. The division operator (/) returns rational numbers.
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1. There are no parentheses placed anywhere.
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1. We use the usual order of operations: multiplication and division happens before addition and subtraction.
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1. It's 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.
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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.
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Example 1:
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```text
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Input: x = 3, target = 19
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Output: 5
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Explanation: 3 * 3 + 3 * 3 + 3 / 3. The expression contains 5 operations.
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```
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Example 2:
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```text
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Input: x = 5, target = 501
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Output: 8
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Explanation: 5 * 5 * 5 * 5 - 5 * 5 * 5 + 5 / 5. The expression contains 8 operations.
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```
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Example 3:
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```text
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Input: x = 100, target = 100000000
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Output: 3
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Explanation: 100 * 100 * 100 * 100. The expression contains 3 operations.
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```
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Note:
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- 2 <= x <= 100
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- 1 <= target <= 2 * 10^8

‎Algorithms/0964.least-operators-to-express-number/least-operators-to-express-number.go

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package problem0964
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func leastOpsExpressTarget(x int, target int) int {
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return 0
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}

‎Algorithms/0964.least-operators-to-express-number/least-operators-to-express-number_test.go

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package problem0964
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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// tcs is testcase slice
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var tcs = []struct {
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x int
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target int
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ans int
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}{
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{
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3,
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19,
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5,
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},
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{
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5,
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501,
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8,
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},
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{
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100,
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100000000,
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3,
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},
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// 可以有多个 testcase
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}
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func Test_leastOpsExpressTarget(t *testing.T) {
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ast := assert.New(t)
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for _, tc := range tcs {
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ast.Equal(tc.ans, leastOpsExpressTarget(tc.x, tc.target), "输入:%v", tc)
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}
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}
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func Benchmark_leastOpsExpressTarget(b *testing.B) {
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for i := 0; i < b.N; i++ {
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for _, tc := range tcs {
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leastOpsExpressTarget(tc.x, tc.target)
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}
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}
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}

‎leetcode.json

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{
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"Username": "aQuaYi",
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"Ranking": 890,
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"Updated": "2019-03-25T21:30:04.280505817+08:00",
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"Ranking": 881,
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"Updated": "2019-03-26T21:06:02.431826249+08:00",
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"Record": {
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