feat: add solutions to lc problem: No.2011

yanglbme · yanglbme · commit 86f4cc1097ea · 2022-12-22T17:20:29.000+08:00
No.2011.Final Value of Variable After Performing Operations
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/README.md b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/README.md
@@ -69,6 +69,12 @@ X--：X 减 1 ，X = 1 - 1 = 0
 
 <!-- 这里可写通用的实现逻辑 -->
 
+**方法一：模拟**
+
+遍历数组 `operations`，对于每个操作 $operations[i]$，如果包含 `'+'`，那么答案加 $1$，否则答案减 $1$。
+
+时间复杂度为 $O(n)$，空间复杂度 $O(1)$。其中 $n$ 为数组 `operations` 的长度。
+
 <!-- tabs:start -->
 
 ### **Python3**
@@ -89,7 +95,7 @@ class Solution:
 class Solution {
     public int finalValueAfterOperations(String[] operations) {
         int ans = 0;
-        for (String s : operations) {
+        for (var s : operations) {
             ans += (s.charAt(1) == '+' ? 1 : -1);
         }
         return ans;
@@ -104,7 +110,7 @@ class Solution {
 public:
     int finalValueAfterOperations(vector<string>& operations) {
         int ans = 0;
-        for (auto s : operations) ans += (s[1] == '+' ? 1 : -1);
+        for (auto& s : operations) ans += (s[1] == '+' ? 1 : -1);
         return ans;
     }
 };
@@ -113,19 +119,34 @@ public:
 ### **Go**
 
 ```go
-func finalValueAfterOperations(operations []string) int {
-    ans := 0
-    for _, s := range operations {
-        if s[1] == '+' {
-            ans += 1
-        } else {
-            ans -= 1
-        }
-    }
-    return ans
+func finalValueAfterOperations(operations []string) (ans int) {
+	for _, s := range operations {
+		if s[1] == '+' {
+			ans += 1
+		} else {
+			ans -= 1
+		}
+	}
+	return
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {string[]} operations
+ * @return {number}
+ */
+var finalValueAfterOperations = function (operations) {
+    let ans = 0;
+    for (const s of operations) {
+        ans += s[1] === '+' ? 1 : -1;
+    }
+    return ans;
+};
+```
+
 ### **TypeScript**
 
 ```ts
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/README_EN.md b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/README_EN.md
@@ -79,7 +79,7 @@ class Solution:
 class Solution {
     public int finalValueAfterOperations(String[] operations) {
         int ans = 0;
-        for (String s : operations) {
+        for (var s : operations) {
             ans += (s.charAt(1) == '+' ? 1 : -1);
         }
         return ans;
@@ -94,7 +94,7 @@ class Solution {
 public:
     int finalValueAfterOperations(vector<string>& operations) {
         int ans = 0;
-        for (auto s : operations) ans += (s[1] == '+' ? 1 : -1);
+        for (auto& s : operations) ans += (s[1] == '+' ? 1 : -1);
         return ans;
     }
 };
@@ -103,19 +103,34 @@ public:
 ### **Go**
 
 ```go
-func finalValueAfterOperations(operations []string) int {
-    ans := 0
-    for _, s := range operations {
-        if s[1] == '+' {
-            ans += 1
-        } else {
-            ans -= 1
-        }
-    }
-    return ans
+func finalValueAfterOperations(operations []string) (ans int) {
+	for _, s := range operations {
+		if s[1] == '+' {
+			ans += 1
+		} else {
+			ans -= 1
+		}
+	}
+	return
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {string[]} operations
+ * @return {number}
+ */
+var finalValueAfterOperations = function (operations) {
+    let ans = 0;
+    for (const s of operations) {
+        ans += s[1] === '+' ? 1 : -1;
+    }
+    return ans;
+};
+```
+
 ### **TypeScript**
 
 ```ts
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.cpp b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.cpp
@@ -2,7 +2,7 @@ class Solution {
 public:
     int finalValueAfterOperations(vector<string>& operations) {
         int ans = 0;
-        for (auto s : operations) ans += (s[1] == '+' ? 1 : -1);
+        for (auto& s : operations) ans += (s[1] == '+' ? 1 : -1);
         return ans;
     }
 };
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.go b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.go
@@ -1,11 +1,10 @@
-func finalValueAfterOperations(operations []string) int {
-    ans := 0
-    for _, s := range operations {
-        if s[1] == '+' {
-            ans += 1
-        } else {
-            ans -= 1
-        }
-    }
-    return ans
+func finalValueAfterOperations(operations []string) (ans int) {
+	for _, s := range operations {
+		if s[1] == '+' {
+			ans += 1
+		} else {
+			ans -= 1
+		}
+	}
+	return
 }
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.java b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.java
@@ -1,7 +1,7 @@
 class Solution {
     public int finalValueAfterOperations(String[] operations) {
         int ans = 0;
-        for (String s : operations) {
+        for (var s : operations) {
             ans += (s.charAt(1) == '+' ? 1 : -1);
         }
         return ans;
diff --git a/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.js b/solution/2000-2099/2011.Final Value of Variable After Performing Operations/Solution.js
@@ -0,0 +1,11 @@
+/**
+ * @param {string[]} operations
+ * @return {number}
+ */
+var finalValueAfterOperations = function (operations) {
+    let ans = 0;
+    for (const s of operations) {
+        ans += s[1] === '+' ? 1 : -1;
+    }
+    return ans;
+};
diff --git a/solution/CONTEST_README.md b/solution/CONTEST_README.md
@@ -11,8 +11,8 @@
 
 | 段位  | 比例   | 段位名   | 国服分数线    | 勋章                                                                    |
 | ----- | ------ | -------- | --------- | --------------------------------------------------------------------------- |
-| LV3 | 5%  | Guardian | &ge;2240.55 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Guardian.gif" style="width: 80px;" /></p> |
-| LV2 | 20% | Knight   | &ge;1877.14 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Knight.gif" style="width: 80px;" /></p>   |
+| LV3 | 5%  | Guardian | &ge;2241.57 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Guardian.gif" style="width: 80px;" /></p> |
+| LV2 | 20% | Knight   | &ge;1876.81 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Knight.gif" style="width: 80px;" /></p>   |
 | LV1 | 75% | -        | -         | -                                                                           |
 
 力扣竞赛 **全国排名前 10** 的用户，全站用户名展示为品牌橙色。
diff --git a/solution/contest.py b/solution/contest.py
@@ -127,8 +127,8 @@ def generate_contest_list():
 
 | 段位  | 比例   | 段位名   | 国服分数线    | 勋章                                                                    |
 | ----- | ------ | -------- | --------- | --------------------------------------------------------------------------- |
-| LV3 | 5%  | Guardian | &ge;2240.55 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Guardian.gif" style="width: 80px;" /></p> |
-| LV2 | 20% | Knight   | &ge;1877.14 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Knight.gif" style="width: 80px;" /></p>   |
+| LV3 | 5%  | Guardian | &ge;2241.57 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Guardian.gif" style="width: 80px;" /></p> |
+| LV2 | 20% | Knight   | &ge;1876.81 | <p><img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/images/Knight.gif" style="width: 80px;" /></p>   |
 | LV1 | 75% | -        | -         | -                                                                           |
 
 力扣竞赛 **全国排名前 10** 的用户，全站用户名展示为品牌橙色。

Original file line number	Diff line number	Diff line change
`@@ -2,7 +2,7 @@ class Solution {`
`2`	`2`	`public:`
`3`	`3`	`int finalValueAfterOperations(vector<string>& operations) {`
`4`	`4`	`int ans = 0;`
`5`		`- for (auto s : operations) ans += (s[1] == '+' ? 1 : -1);`
	`5`	`+ for (auto& s : operations) ans += (s[1] == '+' ? 1 : -1);`
`6`	`6`	`return ans;`
`7`	`7`	`}`
`8`	`8`	`};`
Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,7 @@`
`1`	`1`	`class Solution {`
`2`	`2`	`public int finalValueAfterOperations(String[] operations) {`
`3`	`3`	`int ans = 0;`
`4`		`- for (String s : operations) {`
	`4`	`+ for (var s : operations) {`
`5`	`5`	`ans += (s.charAt(1) == '+' ? 1 : -1);`
`6`	`6`	`}`
`7`	`7`	`return ans;`