From 7aa02403f747ab67deb8abbce4636b55bb2a68ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=82=98=EC=84=B8=EB=B9=88?=
 <94737768+sebbbin@users.noreply.github.com>
Date: Tue, 20 Feb 2024 00:29:50 +0900
Subject: [PATCH 1/2] 240219

---
 ...1\341\206\275\341\204\200\341\205\265.cpp" | 27 ++++++++++++++++
 ...3\341\206\257\341\204\200\341\205\265.cpp" | 32 +++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 "\341\204\211\341\205\251\341\204\211\341\205\256 \341\204\216\341\205\241\341\206\275\341\204\200\341\205\265.cpp"
 create mode 100644 "\341\204\213\341\205\265\341\204\211\341\205\241\341\206\274\341\204\222\341\205\241\341\206\253 \341\204\206\341\205\256\341\206\253\341\204\214\341\205\241 \341\204\206\341\205\241\341\206\253\341\204\203\341\205\263\341\206\257\341\204\200\341\205\265.cpp"

diff --git "a/\341\204\211\341\205\251\341\204\211\341\205\256 \341\204\216\341\205\241\341\206\275\341\204\200\341\205\265.cpp" "b/\341\204\211\341\205\251\341\204\211\341\205\256 \341\204\216\341\205\241\341\206\275\341\204\200\341\205\265.cpp"
new file mode 100644
index 0000000..89b9024
--- /dev/null
+++ "b/\341\204\211\341\205\251\341\204\211\341\205\256 \341\204\216\341\205\241\341\206\275\341\204\200\341\205\265.cpp"	
@@ -0,0 +1,27 @@
+#include <string>
+#include <vector>
+#include <cmath>
+
+using namespace std;
+
+int solution(int n) {
+    int answer = 0;
+    int prime [n+1];
+    for(int i=2; i<=n; i++){
+        prime[i]=i;
+    }
+    for(int i=2; i<=sqrt(n); i++){
+        if(prime[i]==0)
+            continue;
+        // i*k (k<i) 까지의 수는 이미 검사했으므로 j는 i*i 부터 검사해준다.
+        for (int j = i * i; j <= n; j += i)
+        { prime[j] = 0;}
+    }
+    for (int i = 2; i <= n; i++)
+    {
+        if (prime[i] != 0)
+          answer++;
+    }
+    
+    return answer;
+}
\ No newline at end of file
diff --git "a/\341\204\213\341\205\265\341\204\211\341\205\241\341\206\274\341\204\222\341\205\241\341\206\253 \341\204\206\341\205\256\341\206\253\341\204\214\341\205\241 \341\204\206\341\205\241\341\206\253\341\204\203\341\205\263\341\206\257\341\204\200\341\205\265.cpp" "b/\341\204\213\341\205\265\341\204\211\341\205\241\341\206\274\341\204\222\341\205\241\341\206\253 \341\204\206\341\205\256\341\206\253\341\204\214\341\205\241 \341\204\206\341\205\241\341\206\253\341\204\203\341\205\263\341\206\257\341\204\200\341\205\265.cpp"
new file mode 100644
index 0000000..cb366ff
--- /dev/null
+++ "b/\341\204\213\341\205\265\341\204\211\341\205\241\341\206\274\341\204\222\341\205\241\341\206\253 \341\204\206\341\205\256\341\206\253\341\204\214\341\205\241 \341\204\206\341\205\241\341\206\253\341\204\203\341\205\263\341\206\257\341\204\200\341\205\265.cpp"	
@@ -0,0 +1,32 @@
+#include <string>
+#include <vector>
+
+using namespace std;
+
+string solution(string s) {
+    string answer = "";
+    int idx =0;
+    for(int i=0; i<s.size(); i++){
+        if(s[i]==' '){
+            answer.push_back(' ');
+            idx =0;
+            continue;
+        }
+        if(idx%2==0){
+            if(s[i] >= 'a' && s[i] <= 'z')
+            { answer.push_back(s[i]- 'a' + 'A');}
+        else
+        {answer.push_back(s[i]);
+        }
+        }
+        else{
+           if(s[i] >= 'A' && s[i] <= 'Z')
+            { answer.push_back(s[i]- 'A' + 'a');}
+        else
+        {answer.push_back(s[i]);
+        }
+        }
+         idx++;
+    }
+    return answer;
+}
\ No newline at end of file

From 4991b4585042e1dba5a777831812caf994d74e18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=82=98=EC=84=B8=EB=B9=88?=
 <94737768+sebbbin@users.noreply.github.com>
Date: Tue, 20 Feb 2024 00:30:21 +0900
Subject: [PATCH 2/2] 240220

---
 ...1\341\206\267\341\204\222\341\205\251.cpp" | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 "\341\204\211\341\205\265\341\204\214\341\205\245 \341\204\213\341\205\241\341\206\267\341\204\222\341\205\251.cpp"

diff --git "a/\341\204\211\341\205\265\341\204\214\341\205\245 \341\204\213\341\205\241\341\206\267\341\204\222\341\205\251.cpp" "b/\341\204\211\341\205\265\341\204\214\341\205\245 \341\204\213\341\205\241\341\206\267\341\204\222\341\205\251.cpp"
new file mode 100644
index 0000000..d739277
--- /dev/null
+++ "b/\341\204\211\341\205\265\341\204\214\341\205\245 \341\204\213\341\205\241\341\206\267\341\204\222\341\205\251.cpp"	
@@ -0,0 +1,32 @@
+#include <string>
+#include <vector>
+#include <iostream>
+
+using namespace std;
+
+string solution(string s, int n) {
+    string answer = "";
+    for(int i=0; i<s.size(); i++){
+    if(s[i]==' '){
+            answer.push_back(' ');
+            continue;
+    }
+    if(s[i]>96){
+        if(s[i]+n>122){
+            answer.push_back(s[i]+n-26);
+        }
+        else{
+            answer.push_back(s[i]+n);
+        }
+    }
+    else {
+        if(s[i]+n>90){
+            answer.push_back(s[i]+n-26);
+        }
+        else{
+            answer.push_back(s[i]+n);
+        }
+    }
+    }
+    return answer;
+}
\ No newline at end of file