From c3b1a23c6149e8dd6cd1eeabc4c6a07bf19ebcfc Mon Sep 17 00:00:00 2001
From: rl544 <111494264+rl544@users.noreply.github.com>
Date: Sun, 18 Dec 2022 02:05:33 +0900
Subject: [PATCH] =?UTF-8?q?uploaded=20at=202022.=2012.=2018.=20=EC=98=A4?=
 =?UTF-8?q?=EC=A0=84=202:05:32?=
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---
 programmers/평행/solution.java | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 programmers/평행/solution.java

diff --git a/programmers/평행/solution.java b/programmers/평행/solution.java
new file mode 100644
index 0000000..f47de0d
--- /dev/null
+++ b/programmers/평행/solution.java
@@ -0,0 +1,21 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/120875
+
+import java.util.HashMap;
+class Solution {
+    public int solution(int[][] dots) {
+        int answer = 0;
+        HashMap<Double, Integer> hash = new HashMap<>();
+        for(int a = 0; a < dots.length-1; a++){
+            for(int b = a+1; b < dots.length; b++){
+                hash.put((double) (dots[a][1]-dots[b][1])/(dots[a][0]-dots[b][0]),hash.getOrDefault((double) (dots[a][1]-dots[b][1])/(dots[a][0]-dots[b][0]),0)+1);
+            }
+        }
+        for(double key : hash.keySet()){
+            if(hash.get(key)>1) {
+                answer = 1;
+                break;
+            }
+        }
+        return answer;
+    }
+}
\ No newline at end of file