diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..48b3086
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,5 @@
+# yaml-language-server: $schema=https://json.schemastore.org/clang-format-21.x.json
+---
+BasedOnStyle: GNU
+IndentWidth: 2
+---
diff --git a/.gitignore b/.gitignore
index b827212..ead3e7d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-output
+    output
 *.run
diff --git a/.zed/config.json b/.zed/config.json
new file mode 100644
index 0000000..a50344e
--- /dev/null
+++ b/.zed/config.json
@@ -0,0 +1,77 @@
+{
+  "icon_theme": {
+    "mode": "dark",
+    "light": "Zed (Default)",
+    "dark": "Zed (Default)",
+  },
+  "lsp": {
+    "clangd": {
+      "fetch": {
+        "pre_release": true,
+      },
+    },
+  },
+  "agent": {
+    "default_model": {
+      "provider": "zed.dev",
+      "model": "claude-sonnet-4-6",
+      "enable_thinking": true,
+      "effort": "high",
+    },
+    "favorite_models": [],
+    "model_parameters": [],
+  },
+  "auto_install_extensions": {
+    "git-firefly": true,
+    "nix": true,
+    "rust": true,
+    "toml": true,
+  },
+  "autosave": "on_focus_change",
+  "buffer_font_size": 15,
+  // "experimental.theme_overrides": {
+  //   "background": "#FDF7F9",
+  //   "border": "#F2E6EA",
+  //   "border.variant": "#00000000",
+  //   "drop_target.background": "#8165701a",
+  //   "editor.active_line.background": "#8165700f",
+  //   "editor.active_line_number": "#191013",
+  //   "editor.background": "#00000000",
+  //   "editor.gutter.background": "#00000000",
+  //   "editor.highlighted_line.background": "#8165701a",
+  //   "editor.indent_guide": "#F2E6EA",
+  //   "editor.indent_guide_active": "#E6D5DB",
+  //   "editor.line_number": "#A38F96",
+  //   "element.active": "#81657029",
+  //   "element.hover": "#8165700f",
+  //   "element.selected": "#8165701a",
+  //   "elevated_surface.background": "#FDF7F9",
+  //   "ghost_element.active": "#8165701a",
+  //   "ghost_element.background": "#00000000",
+  //   "ghost_element.hover": "#8165700f",
+  //   "ghost_element.selected": "#81657024",
+  //   "hint.background": "#F7EBEE",
+  //   "panel.background": "#00000000",
+  //   "panel.focused_border": "#00000000",
+  //   "panel.indent_guide": "#F2E6EA",
+  //   "panel.indent_guide_active": "#D9C4CC",
+  //   "panel.indent_guide_hover": "#E6D5DB",
+  //   "scrollbar.thumb.background": "#A38F9680",
+  //   "scrollbar.track.background": "#00000000",
+  //   "scrollbar.track.border": "#00000000",
+  //   "status_bar.background": "#FDF7F9",
+  //   "surface.background": "#FDF7F900",
+  //   "tab.active_background": "#8165701a",
+  //   "tab.inactive_background": "#00000000",
+  //   "tab_bar.background": "#00000000",
+  //   "terminal.background": "#00000000",
+  //   "title_bar.background": "#FDF7F9",
+  //   "toolbar.background": "#00000000",
+  // },
+  "theme": {
+    "dark": "Catppuccin Mocha (pink) - No Italics",
+    "light": "One Light",
+    "mode": "dark",
+  },
+  "ui_font_size": 16,
+}
diff --git a/04/ex01.c b/04/ex01.c
new file mode 100644
index 0000000..867149a
--- /dev/null
+++ b/04/ex01.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+
+int main() {
+    int A, B;
+    printf("정수 A : ");
+    scanf("%d", &A);
+    printf("정수 B : ");
+    scanf("%d", &B);
+   
+    if (A % B == 0) {
+        printf("정수 B 는 정수 A의 약수입니다.");
+    }
+    return 0;
+}
diff --git a/04/ex02.c b/04/ex02.c
new file mode 100644
index 0000000..f1b98b0
--- /dev/null
+++ b/04/ex02.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+    int a,b,c,d;
+
+    printf("4개의 정수 입력 : ");
+    scanf("%d %d %d %d", &a, &b, &c, &d);
+
+    if (a > b && a > c && a > d) {
+        printf("가장 큰 수 : %d", a);
+    }
+    else if (b > a && b > c && b > d) {
+        printf("가장 큰 수 : %d", b);
+    }
+    else if (c > a && c > b && c > d) {
+        printf("가장 큰 수 : %d", c);
+    }
+    else {
+        printf("가장 큰 수 : %d", d);
+    }
+}
\ No newline at end of file
diff --git a/04/ex03.c b/04/ex03.c
new file mode 100644
index 0000000..c686077
--- /dev/null
+++ b/04/ex03.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+int main() {
+    int a,b,c;
+
+    printf("3개의 정수 입력 : ");
+    scanf("%d %d %d", &a, &b, &c);
+
+    // 입력한 3개의 숫자중 같은 숫자 갯수 출려r
+    if (a == b && b == c) {
+        printf("입력한 3개의 숫자 중 같은 숫자 : 3개");
+    }
+    else if (a == b || a == c || b == c) {
+        printf("입력한 3개의 숫자 중 같은 숫자 : 2개");
+    }
+    else {
+        printf("입력한 3개의 숫자 중 같은 숫자 : 0개");
+    }
+}
\ No newline at end of file
diff --git a/04/ex04.c b/04/ex04.c
new file mode 100644
index 0000000..b7d0b40
--- /dev/null
+++ b/04/ex04.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+    int a,b;
+
+    printf("정수 2개 입력 : ");
+    scanf("%d %d", &a, &b);
+
+    if (a % 2 == 0 && b % 2 == 0) {
+        printf("짝수의 개수 : 2개\n");
+        printf("홀수의 개수 : 0개");
+    }
+    else if (a % 2 == 0 || b % 2 == 0) {
+        printf("짝수의 개수 : 1개\n");
+        printf("홀수의 개수 : 1개");
+    }
+    else {
+        printf("짝수의 개수 : 0개\n");
+        printf("홀수의 개수 : 2개");
+    }
+}
\ No newline at end of file
diff --git a/04/ex05.c b/04/ex05.c
new file mode 100644
index 0000000..9a10c26
--- /dev/null
+++ b/04/ex05.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main() {
+    int a,b,c;
+
+    printf("삼각형 세 변의 값 입력: ");
+    scanf("%d %d %d", &a, &b, &c);
+
+    if (a + b > c && a + c > b && b + c > a) {
+        printf("삼각형 가능 여부 : yes");
+    } 
+    else {
+        printf("삼각형 가능 여부 : no");
+    }
+}
\ No newline at end of file
diff --git a/04/ex06.c b/04/ex06.c
new file mode 100644
index 0000000..047f480
--- /dev/null
+++ b/04/ex06.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main() {
+    int a,b;
+
+    printf("정수 2개 입력\n");
+    printf("정수 A: ");
+    scanf("%d", &a);
+    printf("정수 B: ");
+    scanf("%d", &b);
+
+    if (a > b) {
+        printf("정수 A가 정수 B보다 크다.");
+    } else if (a == b){
+        printf("정수 A와 정수 B가 같다.");
+    }
+    else {
+        printf("정수 B가 정수 A보다 크다.");
+    }
+}
diff --git a/04/ex07.c b/04/ex07.c
new file mode 100644
index 0000000..0eed8f8
--- /dev/null
+++ b/04/ex07.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main() {
+    int pw;
+
+    printf("비밀번호 입력 : ");
+    scanf("%d", &pw);
+
+    if (pw == 1234) {
+        printf("비밀번호가 맞습니다.");
+    }
+    else {
+        printf("비밀번호가 틀립니다.");
+    }
+}
diff --git a/04/ex08.c b/04/ex08.c
new file mode 100644
index 0000000..1e1af16
--- /dev/null
+++ b/04/ex08.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int main() {
+    int month;
+    printf("월(Month) 입력 : ");
+    scanf("%d", &month);
+
+    switch (month) {
+        case 1:
+        case 3:
+        case 5:
+        case 7:
+        case 8:
+        case 10:
+        case 12:
+            printf("%d월은 31일까지 있습니다", month);
+            break;
+        case 4:
+        case 6:
+        case 9:
+        case 11:
+            printf("%d월은 30일까지 있습니다", month);
+            break;
+        case 2:
+            printf("%d월은 28일까지 있습니다", month);
+            break;
+        default:
+            printf("잘못된 월입니다.");
+            break;
+    }
+}
diff --git a/04/ex09.c b/04/ex09.c
new file mode 100644
index 0000000..cee6913
--- /dev/null
+++ b/04/ex09.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+int main() {
+    int year, month, days;
+
+    printf("<윤년 계산>\n");
+    printf("년도 입력(year) : ");
+    scanf("%d", &year);
+    printf("월(Month) 입력 : ");
+    scanf("%d", &month);
+
+    int isLeap = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
+
+    switch (month) {
+        case 1: case 3: case 5: case 7:
+        case 8: case 10: case 12:
+            days = 31;
+            break;
+        case 4: case 6:
+        case 9: case 11:
+            days = 30;
+            break;
+        case 2:
+            days = isLeap ? 29 : 28;
+            break;
+        default:
+            printf("잘못된 월입니다. (1~12 사이 입력)\n");
+            return 1;
+    }
+
+    printf("%d년 %d월은 %d일까지 있습니다.\n", year, month, days);
+
+    return 0;
+}
diff --git a/04/ex10.c b/04/ex10.c
new file mode 100644
index 0000000..2ec4cca
--- /dev/null
+++ b/04/ex10.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+
+int main() {
+    int a,b;
+    char operator;
+
+    printf("<두 개의 정수와 사칙연산자 입력>\n");
+    printf("정수 2개 입력 : ");
+    scanf("%d %d", &a, &b);
+    printf("연산자입력(+, -, *, /) : ");
+    scanf(" %c", &operator);
+
+    printf("%d %c %d를 수행합니다.\n", a, operator, b);
+    printf("결과 : ");
+
+    switch (operator) {
+        case '+':
+            printf("%d", a + b);
+            break;
+        case '-':
+            printf("%d", a - b);
+            break;
+        case '*':
+            printf("%d", a * b);
+            break;
+        case '/':
+            printf("%.1lf", a / (double)b);
+            break;
+        default:
+            printf("잘못된 연산자입니다.\n");
+            break;
+    }
+}
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..4fec967
--- /dev/null
+++ b/index.js
@@ -0,0 +1,59 @@
+const readline = require('readline');
+
+const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout
+});
+
+rl.on('line', (line) => {
+    if (!line) return;
+    const k = BigInt(line);
+
+    let a, b, c, op1, op2;
+
+    // k = a^2 + b^2 - c^2 구조로 풀기
+    // k - a^2 = b^2 - c^2 = (b-c)(b+c)
+    
+    // 계산의 편의를 위해 a=1 또는 a=2를 선택
+    // 1. a=1 선택
+    a = 1n;
+    let target = k - (a * a);
+    
+    // target이 홀수라면: (n+1)^2 - n^2 = 2n + 1 = target
+    // 2n = target - 1 => n = (target - 1) / 2
+    if (target % 2n !== 0n) {
+        let n = (target - 1n) / 2n;
+        b = n + 1n;
+        c = n;
+        op1 = '+';
+        op2 = '-';
+    } 
+    // target이 짝수라면: a=2로 변경하여 target을 홀수로 만듦
+    else {
+        a = 2n;
+        target = k - (a * a);
+        let n = (target - 1n) / 2n;
+        b = n + 1n;
+        c = n;
+        op1 = '+';
+        op2 = '-';
+    }
+
+    // 만약 c가 0이 되는 경우 (target이 1인 경우) 등 예외 처리
+    // 문제 조건 1 <= a, b, c를 맞추기 위해 조정
+    if (c === 0n) {
+        // k = a^2 + b^2 - c^2 가 안되면 다른 조합 시도 (k는 충분히 큼)
+        // 보통 k가 1 이상이므로 위 로직에서 a, b, c >= 1을 만족하는 해가 대부분 존재함
+        // k=1인 경우: 1 = 1^2 + 1^2 - 1^2 (1 + 1 - 1)
+        if (k === 1n) {
+            console.log("1 + 1 - 1");
+        } else {
+            // 일반적인 출력
+            console.log(`${a} ${op1} ${b} ${op2} ${c}`);
+        }
+    } else {
+        console.log(`${a} ${op1} ${b} ${op2} ${c}`);
+    }
+    
+    rl.close();
+});
diff --git a/layer7/awesome.c b/layer7/awesome.c
new file mode 100644
index 0000000..af04a0a
--- /dev/null
+++ b/layer7/awesome.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int factorial(int n) {
+    if (n <= 1) return 1;
+
+    return n * factorial(n-1);
+}
+
+int main() {
+    int n;
+    scanf("%d", &n);
+    printf("%d", factorial(n));
+    return 0;
+}
diff --git a/layer7/fantastic.c b/layer7/fantastic.c
new file mode 100644
index 0000000..32d1af6
--- /dev/null
+++ b/layer7/fantastic.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main() {
+
+    return 0;
+}
diff --git a/layer7/sans.c b/layer7/sans.c
new file mode 100644
index 0000000..14c8f13
--- /dev/null
+++ b/layer7/sans.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+int main() {
+    int count;
+    scanf("%d", &count);
+    int n[count];
+
+    // for (int i = 0; i < count; i++) {
+    //     scanf("%d", &n[i]);
+    // }
+
+    // for (int i = 0; i <= count; i++) {
+    //     int sum = 0;
+    //     for (int j = 0; j <= i; j++) {
+    //         sum += n[j];
+    //     }
+    //     if (i == count){
+    //         printf("\n");
+    //         continue;
+    //     }
+    //     printf("%d ", sum);
+    // }
+    //
+    int sum = 0;
+    for (int i = 0; i < count; i++) {
+        scanf("%d", &n[i]);
+        sum += n[i];
+        n[i] = sum;
+    }
+
+    for (int i = 0; i < count; i++) printf("%d ", n[i]);
+    printf("\n");
+
+    return 0;
+}
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@@ -0,0 +1,15 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  packages = with pkgs; [
+    gcc
+    gdb
+    gnumake
+    pkg-config
+    icu
+  ];
+
+  shellHook = ''
+    # Work around .NET tools failing on systems where ICU cannot be resolved.
+    export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1
+  '';
+}
\ No newline at end of file