feat: add solution to lc problem: No.3484 (doocs#4731)

Author: yanglbme

solution/3400-3499/3484.Design Spreadsheet/README.md

@@ -312,6 +312,42 @@ impl Spreadsheet {
 }
 ```
 
+#### C#
+
+```cs
+public class Spreadsheet {
+    private Dictionary<string, int> d = new Dictionary<string, int>();
+
+    public Spreadsheet(int rows) {
+    }
+
+    public void SetCell(string cell, int value) {
+        d[cell] = value;
+    }
+
+    public void ResetCell(string cell) {
+        d.Remove(cell);
+    }
+
+    public int GetValue(string formula) {
+        int ans = 0;
+        foreach (string cell in formula.Substring(1).Split('+')) {
+            ans += char.IsDigit(cell[0]) ? int.Parse(cell)
+                                         : (d.ContainsKey(cell) ? d[cell] : 0);
+        }
+        return ans;
+    }
+}
+
+/**
+ * Your Spreadsheet object will be instantiated and called as such:
+ * Spreadsheet obj = new Spreadsheet(rows);
+ * obj.SetCell(cell,value);
+ * obj.ResetCell(cell);
+ * int param_3 = obj.GetValue(formula);
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/3400-3499/3484.Design Spreadsheet/README_EN.md

@@ -310,6 +310,42 @@ impl Spreadsheet {
 }
 ```
 
+#### C#
+
+```cs
+public class Spreadsheet {
+    private Dictionary<string, int> d = new Dictionary<string, int>();
+
+    public Spreadsheet(int rows) {
+    }
+
+    public void SetCell(string cell, int value) {
+        d[cell] = value;
+    }
+
+    public void ResetCell(string cell) {
+        d.Remove(cell);
+    }
+
+    public int GetValue(string formula) {
+        int ans = 0;
+        foreach (string cell in formula.Substring(1).Split('+')) {
+            ans += char.IsDigit(cell[0]) ? int.Parse(cell)
+                                         : (d.ContainsKey(cell) ? d[cell] : 0);
+        }
+        return ans;
+    }
+}
+
+/**
+ * Your Spreadsheet object will be instantiated and called as such:
+ * Spreadsheet obj = new Spreadsheet(rows);
+ * obj.SetCell(cell,value);
+ * obj.ResetCell(cell);
+ * int param_3 = obj.GetValue(formula);
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/3400-3499/3484.Design Spreadsheet/Solution.cs

@@ -0,0 +1,31 @@
+public class Spreadsheet {
+    private Dictionary<string, int> d = new Dictionary<string, int>();
+
+    public Spreadsheet(int rows) {
+    }
+
+    public void SetCell(string cell, int value) {
+        d[cell] = value;
+    }
+
+    public void ResetCell(string cell) {
+        d.Remove(cell);
+    }
+
+    public int GetValue(string formula) {
+        int ans = 0;
+        foreach (string cell in formula.Substring(1).Split('+')) {
+            ans += char.IsDigit(cell[0]) ? int.Parse(cell)
+                                         : (d.ContainsKey(cell) ? d[cell] : 0);
+        }
+        return ans;
+    }
+}
+
+/**
+ * Your Spreadsheet object will be instantiated and called as such:
+ * Spreadsheet obj = new Spreadsheet(rows);
+ * obj.SetCell(cell,value);
+ * obj.ResetCell(cell);
+ * int param_3 = obj.GetValue(formula);
+ */