From c2ea3dfe327875fb525fa2e7483d74d975005d50 Mon Sep 17 00:00:00 2001
From: Won Joon Thomas Choi <113500771+724thomas@users.noreply.github.com>
Date: Mon, 12 Oct 2026 07:55:46 +0900
Subject: [PATCH] Create 4056. Number of Intersecting Interval Pairs I.py

---
 ...Number of Intersecting Interval Pairs I.py | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 leetcode3/4056. Number of Intersecting Interval Pairs I.py

diff --git a/leetcode3/4056. Number of Intersecting Interval Pairs I.py b/leetcode3/4056. Number of Intersecting Interval Pairs I.py
new file mode 100644
index 00000000..6bfac376
--- /dev/null
+++ b/leetcode3/4056. Number of Intersecting Interval Pairs I.py	
@@ -0,0 +1,20 @@
+class Solution:
+    def countIntersectingIntervals(self, intervals: list[list[int]]) -> int:
+        
+        def check_intersect(point1, point2):
+            s1, e1 = point1
+            s2, e2 = point2
+
+            if e1 < s2:
+                return False
+            if e2 < s1:
+                return False
+            return True
+        
+        n = len(intervals)
+        ans = 0
+        for i in range(n):
+            for j in range(i+1, n):
+                if check_intersect(intervals[i], intervals[j]):
+                    ans+=1
+        return ans