Create 3701. Compute Alternating Sum.java

Author: cyzlcyzl

leetcode3/염혜정/3701. Compute Alternating Sum.java

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+// 짝수는 더하고 홀수는 빼기
+// o(n)
+
+class Solution {
+    public int alternatingSum(int[] nums) {
+        int sum = 0;
+        for (int i = 0; i<nums.length; i++) {
+            if (i%2 == 0) sum += nums[i];
+            else sum -= nums[i];
+        }
+        return sum;
+    }
+}