Add solution and test-cases for problem 991

leetcode/901-1000/0991.Broken-Calculator/README.md

@@ -1,28 +1,36 @@
 # [991.Broken Calculator][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+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: a = "11", b = "1"
-Output: "100"
+Input: startValue = 2, target = 3
+Output: 2
+Explanation: Use double operation and then decrement operation {2 -> 4 -> 3}.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Broken Calculator
-```go
 ```
+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}.
+```
 
 ## 结语
 

leetcode/901-1000/0991.Broken-Calculator/Solution.go

@@ -1,5 +1,14 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(startValue, target int) int {
+	ans := 0
+	for target > startValue {
+		ans++
+		if target&1 == 1 {
+			target++
+			continue
+		}
+		target /= 2
+	}
+	return ans + startValue - target
 }

leetcode/901-1000/0991.Broken-Calculator/Solution_test.go

@@ -9,31 +9,31 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name          string
+		start, target int
+		expect        int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 2, 3, 2},
+		{"TestCase2", 5, 8, 2},
+		{"TestCase3", 3, 10, 3},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.start, c.target)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.start, c.target)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }