[D2] Title: 지그재그 숫자, Time: 92 ms, Memory: 25,984 KB -BaekjoonHub

Author: SHIMHUN

SWEA/D2/1986. 지그재그 숫자/README.md

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+# [D2] 지그재그 숫자 - 1986 
+
+[문제 링크](https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AV5PxmBqAe8DFAUq) 
+
+### 성능 요약
+
+메모리: 25,984 KB, 시간: 92 ms, 코드길이: 533 Bytes
+
+### 제출 일자
+
+2025-09-26 17:42
+
+
+
+> 출처: SW Expert Academy, https://swexpertacademy.com/main/code/problem/problemList.do

SWEA/D2/1986. 지그재그 숫자/지그재그 숫자.java

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+import java.util.*;
+
+class Solution
+{
+	public static void main(String args[]) throws Exception
+	{
+		Scanner sc = new Scanner(System.in);
+		int T;
+		T=sc.nextInt();
+        StringBuilder sb = new StringBuilder();
+
+		for(int test_case = 1; test_case <= T; test_case++)
+		{
+			int N = sc.nextInt();
+            int sum = 0;
+            for(int i=1; i<=N; i++){
+            	if(i%2 == 0 ) sum-=i;
+                else sum+=i;
+            }
+            sb.append("#" + test_case+ " " +sum + "\n");
+		}
+        System.out.println(sb);
+	}
+}