feat: add solutions to lc problem: No.2981

Author: rain84

solution/2900-2999/2981.Find Longest Special Substring That Occurs Thrice I/README.md

@@ -269,4 +269,76 @@ function maximumLength(s: string): number {
 
 <!-- solution:end -->
 
+<!-- solution:start -->
+
+### Solution 2: Counting
+
+<!-- tabs:start -->
+
+#### TypeScript
+
+```ts
+function maximumLength(s: string): number {
+    const cnt = new Map<string, number>();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}
+```
+
+### JavaScript
+
+```js
+function maximumLength(s) {
+    const cnt = new Map();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
 <!-- problem:end -->

solution/2900-2999/2981.Find Longest Special Substring That Occurs Thrice I/README_EN.md

@@ -267,4 +267,76 @@ function maximumLength(s: string): number {
 
 <!-- solution:end -->
 
+<!-- solution:start -->
+
+### Solution 2: Counting
+
+<!-- tabs:start -->
+
+#### TypeScript
+
+```ts
+function maximumLength(s: string): number {
+    const cnt = new Map<string, number>();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}
+```
+
+### JavaScript
+
+```js
+function maximumLength(s) {
+    const cnt = new Map();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
 <!-- problem:end -->

solution/2900-2999/2981.Find Longest Special Substring That Occurs Thrice I/Solution2.js

@@ -0,0 +1,26 @@
+function maximumLength(s) {
+    const cnt = new Map();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}

solution/2900-2999/2981.Find Longest Special Substring That Occurs Thrice I/Solution2.ts

@@ -0,0 +1,26 @@
+function maximumLength(s: string): number {
+    const cnt = new Map<string, number>();
+    const n = s.length;
+    let [c, ch] = [0, ''];
+
+    for (let i = 0; i < n + 1; i++) {
+        if (ch === s[i]) {
+            c++;
+        } else {
+            let j = 1;
+            while (c) {
+                const char = ch.repeat(j++);
+                cnt.set(char, (cnt.get(char) ?? 0) + c);
+                c--;
+            }
+
+            ch = s[i];
+            c = 1;
+        }
+    }
+
+    const vals = [...cnt.entries()].filter(([, c]) => c >= 3).map(([x]) => x.length);
+    const res = Math.max(...vals);
+
+    return res === Number.NEGATIVE_INFINITY ? -1 : res;
+}