From 2523bdda53a36f1788a066c8619294206e80c5ea Mon Sep 17 00:00:00 2001
From: songyc macbook <gitea@gitea>
Date: Fri, 19 Dec 2025 20:56:23 +0900
Subject: [PATCH] baekjoon 20251219

---
 code_study/Baekjoon/java/_2845.java | 14 ++++++++++++
 code_study/Baekjoon/ts/1644.ts      | 33 +++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 code_study/Baekjoon/java/_2845.java
 create mode 100644 code_study/Baekjoon/ts/1644.ts

diff --git a/code_study/Baekjoon/java/_2845.java b/code_study/Baekjoon/java/_2845.java
new file mode 100644
index 0000000..ef49e8c
--- /dev/null
+++ b/code_study/Baekjoon/java/_2845.java
@@ -0,0 +1,14 @@
+import java.util.*;
+
+public class _2845 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int L = sc.nextInt();
+        int P = sc.nextInt();
+        int N = L*P;
+
+        for(int i=0; i<5; i++) System.out.printf("%d ", sc.nextInt() - N);
+
+        sc.close();
+    }
+}
diff --git a/code_study/Baekjoon/ts/1644.ts b/code_study/Baekjoon/ts/1644.ts
new file mode 100644
index 0000000..1d6e166
--- /dev/null
+++ b/code_study/Baekjoon/ts/1644.ts
@@ -0,0 +1,33 @@
+export {};
+const N: number = Number(require("fs").readFileSync(0).toString().trim());
+
+let isPrime: boolean[] = Array(N+1).fill(true);
+isPrime[0] = false; isPrime[1] = false;
+
+for(let i=2; i*i <= N; i++) {
+    if(isPrime[i]) {
+        for(let j=i*i; j<=N; j+=i) isPrime[j] = false
+    }
+}
+
+let nums: number[] = [];
+for(let n=2; n<=N; n++) if(isPrime[n]) nums.push(n);
+
+let [L, R]: number[] = [0,0];
+let acc: number = nums[0];
+let count: number = 0;
+
+while(R < nums.length) {
+    if(acc === N) {
+        count++;
+        acc -= nums[L++];
+    }
+    else if(acc > N) {
+        acc -= nums[L++];
+    }
+    else {
+        if(++R < nums.length) acc += nums[R];
+    }
+}
+
+console.log(count);
\ No newline at end of file