From c58a92afdc34a92586887de4f72fc1408f920d7d Mon Sep 17 00:00:00 2001
From: sh0723 <pshpark12345@naver.com>
Date: Tue, 1 Sep 2026 15:46:35 +0900
Subject: [PATCH] =?UTF-8?q?2170=20:=20=EC=84=A0=EA=B8=8B=EA=B8=B0=20solve?=
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---
 src/week5/BOJ2170/BOJ2170_V1.cpp | 39 ++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/week5/BOJ2170/BOJ2170_V1.cpp

diff --git a/src/week5/BOJ2170/BOJ2170_V1.cpp b/src/week5/BOJ2170/BOJ2170_V1.cpp
new file mode 100644
index 0000000..cb225df
--- /dev/null
+++ b/src/week5/BOJ2170/BOJ2170_V1.cpp
@@ -0,0 +1,39 @@
+#include <bits/stdc++.h>
+using namespace std;
+int N;
+vector<pair<int, int>> inp;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+    cin >> N;
+
+    for (int i=0; i<N; i++) {
+        int st,ed;
+        cin >> st >> ed;
+        inp.push_back({st,ed});
+    }
+
+    sort(inp.begin(), inp.end());
+
+    int ret=0;
+    int st=inp[0].first,ed=inp[0].second;
+
+    for (int i=1; i<N; i++) {
+        if (inp[i].first > ed) {
+            ret += (ed-st);
+            st = inp[i].first;
+            ed = inp[i].second;
+        } else {
+            if (ed < inp[i].second) ed = inp[i].second;
+        }
+    }
+
+    ret += (ed-st);
+
+    cout << ret << '\n';
+
+    return 0;
+}
\ No newline at end of file