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fix:fix file empty

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lcof/面试题64. 求1+2+...+n

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`‎lcof/面试题64. 求1+2+...+n/Solution.cpp‎`

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`@@ -0,0 +1,9 @@`
	`1`	`+class Solution`
	`2`	`+{`
	`3`	`+public:`
	`4`	`+ int sumNums(int n)`
	`5`	`+ {`
	`6`	`+ n && (n += sumNums(n - 1));`
	`7`	`+ return n;`
	`8`	`+ }`
	`9`	`+};`

`‎lcof/面试题64. 求1+2+...+n/Solution.rs‎`

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`@@ -0,0 +1,6 @@`
	`1`	`+impl Solution {`
	`2`	`+ pub fn sum_nums(mut n: i32) -> i32 {`
	`3`	`+ n!=0&&(n+=Solution::sum_nums(n-1),true).1;`
	`4`	`+ n`
	`5`	`+ }`
	`6`	`+}`

`‎lcof/面试题64. 求1+2+...+n/Solution.ts‎`

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

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