feat: add TypeScript solution to lc problem: No.1208

Author: rain84

solution/1200-1299/1208.Get Equal Substrings Within Budget/README.md

@@ -322,6 +322,28 @@ func abs(x int) int {
 }
 ```
 
+#### TypeScript
+
+```ts
+function equalSubstring(s: string, t: string, maxCost: number): number {
+    const getCost = (i: number) => Math.abs(s[i].charCodeAt(0) - t[i].charCodeAt(0));
+    const n = s.length;
+    let res = 0;
+    let l = 0;
+    let r = -1;
+    let cost = 0;
+
+    while (++r < n) {
+        cost += getCost(r);
+
+        if (cost <= maxCost) res = Math.max(res, r - l + 1);
+        else cost -= getCost(l++);
+    }
+
+    return res;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/1200-1299/1208.Get Equal Substrings Within Budget/README_EN.md

@@ -319,6 +319,28 @@ func abs(x int) int {
 }
 ```
 
+#### TypeScript
+
+```ts
+function equalSubstring(s: string, t: string, maxCost: number): number {
+    const getCost = (i: number) => Math.abs(s[i].charCodeAt(0) - t[i].charCodeAt(0));
+    const n = s.length;
+    let res = 0;
+    let l = 0;
+    let r = -1;
+    let cost = 0;
+
+    while (++r < n) {
+        cost += getCost(r);
+
+        if (cost <= maxCost) res = Math.max(res, r - l + 1);
+        else cost -= getCost(l++);
+    }
+
+    return res;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/1200-1299/1208.Get Equal Substrings Within Budget/Solution2.ts

@@ -0,0 +1,17 @@
+function equalSubstring(s: string, t: string, maxCost: number): number {
+    const getCost = (i: number) => Math.abs(s[i].charCodeAt(0) - t[i].charCodeAt(0));
+    const n = s.length;
+    let res = 0;
+    let l = 0;
+    let r = -1;
+    let cost = 0;
+
+    while (++r < n) {
+        cost += getCost(r);
+
+        if (cost <= maxCost) res = Math.max(res, r - l + 1);
+        else cost -= getCost(l++);
+    }
+
+    return res;
+}