feat: add typescript solution to lcci problem: No.03.02.Min Stack (doocs#487)

Author: zhaocchen

lcci/03.02.Min Stack/README.md

@@ -97,6 +97,46 @@ class MinStack {
  */
 ```
 
+### **TypeScript**
+
+```ts
+class MinStack {
+    stack: number[];
+    mins: number[];
+    constructor() {
+        this.stack = [];
+        this.mins = [];
+    }
+
+    push(x: number): void {
+        this.stack.push(x);
+        this.mins.push(Math.min(this.getMin(), x));
+    }
+
+    pop(): void {
+        this.stack.pop();
+        this.mins.pop();
+    }
+
+    top(): number {
+        return this.stack[this.stack.length - 1];
+    }
+
+    getMin(): number {
+        return this.mins.length == 0 ? Infinity : this.mins[this.mins.length - 1];
+    }
+}
+
+/**
+ * Your MinStack object will be instantiated and called as such:
+ * var obj = new MinStack()
+ * obj.push(x)
+ * obj.pop()
+ * var param_3 = obj.top()
+ * var param_4 = obj.getMin()
+ */
+```
+
 ### **...**
 
 ```

lcci/03.02.Min Stack/README_EN.md

@@ -108,6 +108,46 @@ class MinStack {
  */
 ```
 
+### **TypeScript**
+
+```ts
+class MinStack {
+    stack: number[];
+    mins: number[];
+    constructor() {
+        this.stack = [];
+        this.mins = [];
+    }
+
+    push(x: number): void {
+        this.stack.push(x);
+        this.mins.push(Math.min(this.getMin(), x));
+    }
+
+    pop(): void {
+        this.stack.pop();
+        this.mins.pop();
+    }
+
+    top(): number {
+        return this.stack[this.stack.length - 1];
+    }
+
+    getMin(): number {
+        return this.mins.length == 0 ? Infinity : this.mins[this.mins.length - 1];
+    }
+}
+
+/**
+ * Your MinStack object will be instantiated and called as such:
+ * var obj = new MinStack()
+ * obj.push(x)
+ * obj.pop()
+ * var param_3 = obj.top()
+ * var param_4 = obj.getMin()
+ */
+```
+
 ### **...**
 
 ```

lcci/03.02.Min Stack/Solution.ts

@@ -0,0 +1,35 @@
+class MinStack {
+    stack: number[];
+    mins: number[];
+    constructor() {
+        this.stack = [];
+        this.mins = [];
+    }
+
+    push(x: number): void {
+        this.stack.push(x);
+        this.mins.push(Math.min(this.getMin(), x));
+    }
+
+    pop(): void {
+        this.stack.pop();
+        this.mins.pop();
+    }
+
+    top(): number {
+        return this.stack[this.stack.length - 1];
+    }
+
+    getMin(): number {
+        return this.mins.length == 0 ? Infinity : this.mins[this.mins.length - 1];
+    }
+}
+
+/**
+ * Your MinStack object will be instantiated and called as such:
+ * var obj = new MinStack()
+ * obj.push(x)
+ * obj.pop()
+ * var param_3 = obj.top()
+ * var param_4 = obj.getMin()
+ */