diff --git "a/src/main/kotlin/byeonghee/week53/\352\265\254\352\260\204 \355\225\251 \352\265\254\355\225\230\352\270\260 5.kt" "b/src/main/kotlin/byeonghee/week53/\352\265\254\352\260\204 \355\225\251 \352\265\254\355\225\230\352\270\260 5.kt"
new file mode 100644
index 00000000..5ef8addf
--- /dev/null
+++ "b/src/main/kotlin/byeonghee/week53/\352\265\254\352\260\204 \355\225\251 \352\265\254\355\225\230\352\270\260 5.kt"	
@@ -0,0 +1,34 @@
+package byeonghee.week53
+
+class 소병희_구간합구하기5 {
+    companion object {
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val (n, m) = readLine().split(" ").map { it.toInt() }
+            val table = Array(n + 1) { IntArray(n + 1) }
+            val sb = StringBuilder()
+
+            repeat(n) { i ->
+                readLine().split(" ").forEachIndexed { j, v ->
+                    table[i+1][j+1] = table[i+1][j] + v.toInt()
+                }
+            }
+
+            repeat(n) { i ->
+                repeat(n) { j ->
+                    table[i+1][j+1] += table[i][j+1]
+                }
+            }
+
+            repeat(m) {
+                val (r1, c1, r2, c2) = readLine().split(" ").map { it.toInt() }
+                sb.appendLine(table[r2][c2] + table[r1-1][c1-1] - table[r1-1][c2] - table[r2][c1-1])
+            }
+
+            println(sb)
+        }
+    }
+}
+
+fun main() {
+    소병희_구간합구하기5.solve()
+}
\ No newline at end of file
diff --git "a/src/main/kotlin/byeonghee/week53/\353\217\204\353\204\233\352\263\274 \353\247\211\353\214\200 \352\267\270\353\236\230\355\224\204.kt" "b/src/main/kotlin/byeonghee/week53/\353\217\204\353\204\233\352\263\274 \353\247\211\353\214\200 \352\267\270\353\236\230\355\224\204.kt"
new file mode 100644
index 00000000..d9e1f490
--- /dev/null
+++ "b/src/main/kotlin/byeonghee/week53/\353\217\204\353\204\233\352\263\274 \353\247\211\353\214\200 \352\267\270\353\236\230\355\224\204.kt"	
@@ -0,0 +1,27 @@
+package byeonghee.week53
+
+class 소병희_도넛과막대그래프 {
+    fun solution(edges: Array<IntArray>): IntArray {
+        val answer = IntArray(4)
+        val inDegree = IntArray(1_000_001)
+        val outDegree = IntArray(1_000_001)
+
+        for((from, to) in edges) {
+            outDegree[from]++
+            inDegree[to]++
+        }
+
+        var v = 1
+        while(inDegree[v] > 0 || outDegree[v] > 0) {
+            if (inDegree[v] == 0 && outDegree[v] >= 2) answer[0] = v
+            else if (outDegree[v] == 0) answer[2]++
+            else if (inDegree[v] >= 2 && outDegree[v] == 2) answer[3]++
+
+            v++
+        }
+
+        answer[1] = outDegree[answer[0]] - answer[2] - answer[3]
+
+        return answer
+    }
+}
\ No newline at end of file
diff --git "a/src/main/kotlin/byeonghee/week53/\354\236\221\354\227\205.kt" "b/src/main/kotlin/byeonghee/week53/\354\236\221\354\227\205.kt"
new file mode 100644
index 00000000..aee9601a
--- /dev/null
+++ "b/src/main/kotlin/byeonghee/week53/\354\236\221\354\227\205.kt"
@@ -0,0 +1,39 @@
+package byeonghee.week53
+
+class 소병희_작업 {
+    companion object {
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val (n, m) = readLine().split(" ").map { it.toInt() }
+            val preJob = Array(n + 1) { ArrayDeque<Int>() }
+
+            repeat(m) {
+                val (pre, cur) = readLine().split(" ").map { it.toInt() }
+                preJob[cur].add(pre)
+            }
+
+            val x = readLine().toInt()
+            var answer = 0
+            val visited = BooleanArray(n+1)
+            val q = ArrayDeque<Int>(x)
+            q.add(x)
+            visited[x] = true
+
+            while(q.isNotEmpty()) {
+                val cur = q.removeFirst()
+                preJob[cur].forEach {
+                    if (visited[it].not()) {
+                        q.add(it)
+                        visited[it] = true
+                        answer++
+                    }
+                }
+            }
+
+            println(answer)
+        }
+    }
+}
+
+fun main() {
+    소병희_작업.solve()
+}
\ No newline at end of file
diff --git "a/src/main/kotlin/byeonghee/week53/\355\202\244 \354\210\234\354\204\234.kt" "b/src/main/kotlin/byeonghee/week53/\355\202\244 \354\210\234\354\204\234.kt"
new file mode 100644
index 00000000..f338b298
--- /dev/null
+++ "b/src/main/kotlin/byeonghee/week53/\355\202\244 \354\210\234\354\204\234.kt"	
@@ -0,0 +1,46 @@
+package byeonghee.week53
+
+class 소병희_키순서 {
+    companion object {
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val (n, m) = readLine().split(" ").map { it.toInt() }
+            val adj = Array(n) { IntArray(n) }
+
+            repeat(m) {
+                val (low, high) = readLine().split(" ").map { it.toInt() - 1 }
+                adj[low][high] = 1
+                adj[high][low] = -1
+            }
+
+            for(mid in 0 until n) for(a in 0 until n) for(b in 0 until n) {
+                val compare = adj[a][mid] + adj[mid][b]
+                when (compare) {
+                    2 -> {
+                        adj[a][b] = 1
+                        adj[b][a] = -1
+                    }
+
+                    -2 -> {
+                        adj[a][b] = -1
+                        adj[b][a] = 1
+                    }
+                }
+            }
+
+            var answer = 0
+            for(a in 0 until n) {
+                var cnt = 1
+                for(b in 0 until n) {
+                    if (adj[a][b] != 0) cnt++
+                }
+                if (cnt == n) answer++
+            }
+
+            println(answer)
+        }
+    }
+}
+
+fun main() {
+    소병희_키순서.solve()
+}
\ No newline at end of file