From f48043121567310713967805b927f371d15cdb51 Mon Sep 17 00:00:00 2001
From: sh0723 <pshpark12345@naver.com>
Date: Fri, 31 Jul 2026 13:07:48 +0900
Subject: [PATCH] =?UTF-8?q?1911=20:=20=ED=9D=99=EA=B8=B8=20=EB=B3=B4?=
 =?UTF-8?q?=EC=88=98=ED=95=98=EA=B8=B0=20solve?=
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---
 src/week5/BOJ1911/BOJ1911_V1.cpp | 42 ++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/week5/BOJ1911/BOJ1911_V1.cpp

diff --git a/src/week5/BOJ1911/BOJ1911_V1.cpp b/src/week5/BOJ1911/BOJ1911_V1.cpp
new file mode 100644
index 0000000..8881a62
--- /dev/null
+++ b/src/week5/BOJ1911/BOJ1911_V1.cpp
@@ -0,0 +1,42 @@
+#include <bits/stdc++.h>
+using namespace std;
+vector<pair<int, int>> inp;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+    int N,L;
+    cin >> N >> L;
+
+    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 =0, ed=0;
+    for (pair<int, int> curr : inp) {
+        int cnt = 0;
+        if (ed >= curr.second) continue;
+
+        if (ed < curr.first) {
+            st = curr.first;
+        } else {
+            st = ed;
+        }
+        ed = curr.second;
+
+        cnt += (ed-st)/L;
+        if ((ed-st)%L) cnt+=1;
+        ret += cnt;
+        ed = st + L * cnt;
+    }
+    cout << ret;
+
+    return 0;
+}
\ No newline at end of file