From c3743b563b5330c6f441d29239ff0775a43143e0 Mon Sep 17 00:00:00 2001
From: songyc macbook <gitea@gitea>
Date: Sun, 26 Oct 2025 17:10:15 +0900
Subject: [PATCH] 20251026 baekjoon

---
 code_study/Baekjoon/c/2420.c          |  9 ++++
 code_study/Baekjoon/java/_2420.java   | 11 +++++
 code_study/Baekjoon/python/2420.py    |  1 +
 code_study/Baekjoon/swift/11779.swift | 65 +++++++++++++++++++++++++++
 code_study/Baekjoon/swift/2420.swift  |  5 +++
 code_study/Baekjoon/ts/2420.ts        |  5 +++
 6 files changed, 96 insertions(+)
 create mode 100644 code_study/Baekjoon/c/2420.c
 create mode 100644 code_study/Baekjoon/java/_2420.java
 create mode 100644 code_study/Baekjoon/python/2420.py
 create mode 100644 code_study/Baekjoon/swift/11779.swift
 create mode 100644 code_study/Baekjoon/swift/2420.swift
 create mode 100644 code_study/Baekjoon/ts/2420.ts

diff --git a/code_study/Baekjoon/c/2420.c b/code_study/Baekjoon/c/2420.c
new file mode 100644
index 0000000..7c550ea
--- /dev/null
+++ b/code_study/Baekjoon/c/2420.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    long long a, b;
+    scanf("%lld %lld",&a, &b);
+    printf("%lld\n",llabs(a-b));
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/java/_2420.java b/code_study/Baekjoon/java/_2420.java
new file mode 100644
index 0000000..87fb13f
--- /dev/null
+++ b/code_study/Baekjoon/java/_2420.java
@@ -0,0 +1,11 @@
+import java.util.*;
+
+public class _2420 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        long a = sc.nextLong();
+        long b = sc.nextLong();
+        System.out.println(Math.abs(a-b));
+        sc.close();
+    }
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2420.py b/code_study/Baekjoon/python/2420.py
new file mode 100644
index 0000000..82e1337
--- /dev/null
+++ b/code_study/Baekjoon/python/2420.py
@@ -0,0 +1 @@
+print(abs((lambda n: n[0]-n[1])(list(map(int, input().split())))))
\ No newline at end of file
diff --git a/code_study/Baekjoon/swift/11779.swift b/code_study/Baekjoon/swift/11779.swift
new file mode 100644
index 0000000..7fd4a3a
--- /dev/null
+++ b/code_study/Baekjoon/swift/11779.swift
@@ -0,0 +1,65 @@
+if let n = Int(readLine() ?? ""),
+   let m = Int(readLine() ?? "")
+{
+    var graph: [[(v: Int, w: Int)]] = Array(repeating: [], count: n+1)
+
+    for _ in 0..<m {
+        if let input = readLine(),
+           let nums = input.split(separator: " ").compactMap({Int($0)}) as? [Int],
+           nums.count == 3
+        {
+            let u = nums[0]
+            let v = nums[1]
+            let w = nums[2]
+            graph[u].append((v: v, w: w))
+        }
+    }
+    
+    if let input = readLine(),
+       let start_end = input.split(separator: " ").compactMap({Int($0)}) as? [Int],
+       start_end.count == 2
+    {
+        let start = start_end[0]
+        let end = start_end[1]
+        
+        var prev = Array(repeating: 0, count: n+1)
+        var qu: [(now: Int, distance: Int)] = []
+        var distance: [Int] = Array(repeating: Int.max, count: n+1)
+        
+        qu.append((now: start, distance: 0))
+        distance[start] = 0
+        
+        while !qu.isEmpty {
+            let current = qu.removeFirst()
+            
+            if distance[current.now] < current.distance {
+                continue
+            }
+            
+            for next in graph[current.now] {
+                if distance[next.v] > distance[current.now] + next.w {
+                    distance[next.v] = distance[current.now] + next.w
+                    prev[next.v] = current.now
+                    qu.append((now: next.v, distance: distance[next.v]))
+                }
+            }
+        }
+        
+        var path: [Int] = []
+        path.append(end)
+        
+        while true {
+            let temp = path[path.count-1]
+            if prev[temp] == 0 {
+                break
+            }
+            path.append(prev[temp])
+        }
+        
+        path.reverse()
+        
+        print(distance[end])
+        print(path.count)
+        print(path.map({String($0)}).joined(separator: " "))
+    }
+}
diff --git a/code_study/Baekjoon/swift/2420.swift b/code_study/Baekjoon/swift/2420.swift
new file mode 100644
index 0000000..b6594d8
--- /dev/null
+++ b/code_study/Baekjoon/swift/2420.swift
@@ -0,0 +1,5 @@
+if let input = readLine(),
+   let nums = input.split(separator: " ").map({Int64($0)}) as? [Int64]
+{
+    print(abs(nums[0]-nums[1]))
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/ts/2420.ts b/code_study/Baekjoon/ts/2420.ts
new file mode 100644
index 0000000..37a0ff4
--- /dev/null
+++ b/code_study/Baekjoon/ts/2420.ts
@@ -0,0 +1,5 @@
+export {};
+console.log(Math.abs(require("fs").readFileSync(0)
+                .toString().trim().split(" ").map(Number)
+                .reduce((acc,v,i) => i===0 ? acc-v : acc+v,0)
+));
\ No newline at end of file