feat: add js solution to lc problem: No.1717

Author: rain84

solution/1700-1799/1717.Maximum Score From Removing Substrings/README.md

@@ -259,6 +259,38 @@ function maximumGain(s: string, x: number, y: number): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function maximumGain(s, x, y) {
+    let [a, b] = ['a', 'b'];
+    if (x < y) {
+        [x, y] = [y, x];
+        [a, b] = [b, a];
+    }
+
+    let [ans, cnt1, cnt2] = [0, 0, 0];
+    for (let c of s) {
+        if (c === a) {
+            cnt1++;
+        } else if (c === b) {
+            if (cnt1) {
+                ans += x;
+                cnt1--;
+            } else {
+                cnt2++;
+            }
+        } else {
+            ans += Math.min(cnt1, cnt2) * y;
+            cnt1 = 0;
+            cnt2 = 0;
+        }
+    }
+    ans += Math.min(cnt1, cnt2) * y;
+    return ans;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/1700-1799/1717.Maximum Score From Removing Substrings/README_EN.md

@@ -259,6 +259,38 @@ function maximumGain(s: string, x: number, y: number): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function maximumGain(s, x, y) {
+    let [a, b] = ['a', 'b'];
+    if (x < y) {
+        [x, y] = [y, x];
+        [a, b] = [b, a];
+    }
+
+    let [ans, cnt1, cnt2] = [0, 0, 0];
+    for (let c of s) {
+        if (c === a) {
+            cnt1++;
+        } else if (c === b) {
+            if (cnt1) {
+                ans += x;
+                cnt1--;
+            } else {
+                cnt2++;
+            }
+        } else {
+            ans += Math.min(cnt1, cnt2) * y;
+            cnt1 = 0;
+            cnt2 = 0;
+        }
+    }
+    ans += Math.min(cnt1, cnt2) * y;
+    return ans;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/1700-1799/1717.Maximum Score From Removing Substrings/Solution.js

@@ -0,0 +1,27 @@
+function maximumGain(s, x, y) {
+    let [a, b] = ['a', 'b'];
+    if (x < y) {
+        [x, y] = [y, x];
+        [a, b] = [b, a];
+    }
+
+    let [ans, cnt1, cnt2] = [0, 0, 0];
+    for (let c of s) {
+        if (c === a) {
+            cnt1++;
+        } else if (c === b) {
+            if (cnt1) {
+                ans += x;
+                cnt1--;
+            } else {
+                cnt2++;
+            }
+        } else {
+            ans += Math.min(cnt1, cnt2) * y;
+            cnt1 = 0;
+            cnt2 = 0;
+        }
+    }
+    ans += Math.min(cnt1, cnt2) * y;
+    return ans;
+}