diff --git "a/src/3week/jaewon/\354\243\274\354\260\250 \354\232\224\352\270\210 \352\263\204\354\202\260.kt" "b/src/3week/jaewon/\354\243\274\354\260\250 \354\232\224\352\270\210 \352\263\204\354\202\260.kt"
new file mode 100644
index 0000000..59e18b8
--- /dev/null
+++ "b/src/3week/jaewon/\354\243\274\354\260\250 \354\232\224\352\270\210 \352\263\204\354\202\260.kt"	
@@ -0,0 +1,42 @@
+class jaewon_Solution {
+    fun solution(fees: IntArray, records: Array<String>): IntArray {
+        var answer: IntArray = intArrayOf()
+        val keys = records.groupBy{it.split(" ")[1]}
+        val blank = keys.keys.associateWith{0}.toMutableMap()
+
+        keys.values.forEach{ key ->
+            val times = key.map{(it.split(" ")[0].split(":"))}.flatten().toMutableList()
+            if(times.size%4 != 0){
+                times.add("23")
+                times.add("59")
+            }
+            var i = 0
+            var total = 0
+            repeat(times.size/4){
+                // 입출차 셋트
+                var h = (times[i+2].toInt()-times[i].toInt()) * 60
+                var m = times[i+3].toInt()-times[i+1].toInt()
+                total += h+m
+                i+=4
+            }
+            blank[key[0].split(" ")[1]] = total
+        }
+
+        answer = blank.mapValues{
+            val v = it.value
+            var temp = 0
+            if(fees[0] < v){
+                val add = if((v-fees[0])%fees[2] != 0) (v-fees[0])/fees[2]+1 else (v-fees[0])/fees[2]
+                temp = add*fees[3]
+            }
+            fees[1] + temp
+        }.toList().sortedBy{it.first}.map{it.second}.toIntArray()
+        return answer
+    }
+}
+
+fun main(){
+    jaewon_Solution().solution(
+        intArrayOf(180,5000,10,600), arrayOf("05:34 5961 IN", "06:00 0000 IN", "06:34 0000 OUT", "07:59 5961 OUT", "07:59 0148 IN", "18:59 0000 IN", "19:09 0148 OUT", "22:59 5961 IN", "23:00 5961 OUT")
+    )
+}
\ No newline at end of file
diff --git "a/src/3week/jaewon/\355\212\270\353\246\254\354\235\230 \353\266\200\353\252\250 \354\260\276\352\270\260.kt" "b/src/3week/jaewon/\355\212\270\353\246\254\354\235\230 \353\266\200\353\252\250 \354\260\276\352\270\260.kt"
new file mode 100644
index 0000000..78daa80
--- /dev/null
+++ "b/src/3week/jaewon/\355\212\270\353\246\254\354\235\230 \353\266\200\353\252\250 \354\260\276\352\270\260.kt"	
@@ -0,0 +1,32 @@
+import java.lang.StringBuilder
+import java.util.LinkedList
+
+fun main(){
+    val n = readln().toInt()
+    val tree  = Array(n+1){ LinkedList<Int>()}
+    val visited = BooleanArray(n+1){ false }
+    val parents = IntArray(n+1){-1}
+    //인접리스트 만들기
+    repeat(n-1){
+        val (a,b) = readln().split(" ").map { it.toInt() }
+        tree[a].add(b)
+        tree[b].add(a)
+    }
+
+    fun dfs(n: Int){
+        for(num in tree[n]){
+            if(!visited[num]) {
+                visited[num] = true
+                parents[num] = n
+                dfs(num)
+            }
+        }
+    }
+
+    dfs(1)
+    val answer = StringBuilder()
+    for (i in 2..n){
+        answer.append("${parents[i]}\n")
+    }
+    println(answer.toString())
+}
\ No newline at end of file
diff --git "a/src/3week/jaewon/\355\232\214\354\235\230\354\213\244 \353\260\260\354\240\225.kt" "b/src/3week/jaewon/\355\232\214\354\235\230\354\213\244 \353\260\260\354\240\225.kt"
new file mode 100644
index 0000000..173ae9f
--- /dev/null
+++ "b/src/3week/jaewon/\355\232\214\354\235\230\354\213\244 \353\260\260\354\240\225.kt"	
@@ -0,0 +1,33 @@
+
+class jaewon회의실배정 {
+
+    data class TimeTable(val start : Int, val end : Int)
+
+    fun solution(){
+        val n = readln().toInt()
+        val timeTable = mutableListOf<TimeTable>()
+        var endTime = 0
+        var count = 0
+
+        repeat(n){
+            val (start,end) = readln().split(" ").map { it.toInt() }
+            timeTable.add(TimeTable(start, end))
+        }
+
+        timeTable
+            .sortedWith( compareBy<TimeTable> { it.end }.thenBy { -(it.end - it.start) })
+            .forEach {
+                if (it.start >= endTime){
+                    count++
+                    endTime = it.end
+                }
+            }
+
+        println(count)
+    }
+}
+
+fun main(){
+    jaewon회의실배정().solution()
+}
+