fix:fix file empty

Author: ScarboroughCoral

lcof/面试题64. 求1+2+…+n/Solution.cpp

@@ -0,0 +1,9 @@
+class Solution
+{
+public:
+  int sumNums(int n)
+  {
+    n && (n += sumNums(n - 1));
+    return n;
+  }
+};

lcof/面试题64. 求1+2+…+n/Solution.rs

@@ -0,0 +1,6 @@
+impl Solution {
+  pub fn sum_nums(mut n: i32) -> i32 {
+      n!=0&&(n+=Solution::sum_nums(n-1),true).1;
+      n
+  }
+}

lcof/面试题64. 求1+2+…+n/Solution.ts

@@ -0,0 +1,3 @@
+var sumNums = function (n: number): number {
+  return n && n + sumNums(n - 1);
+};