diff --git "a/live8/test90/\353\254\270\354\240\2341/\353\260\261\355\225\234\352\262\260.py" "b/live8/test90/\353\254\270\354\240\2341/\353\260\261\355\225\234\352\262\260.py"
new file mode 100644
index 00000000..6737e6e5
--- /dev/null
+++ "b/live8/test90/\353\254\270\354\240\2341/\353\260\261\355\225\234\352\262\260.py"
@@ -0,0 +1,30 @@
+def main():
+    n = int(input())
+
+    array = list(map(int, input().strip().split()))[:n]
+
+    x = int(input())
+
+    array.sort()
+
+    count = 0
+    left, right = 0, n - 1
+
+    while left < right:
+        sum = array[left] + array[right]
+
+        if sum == x:
+            count += 1
+            left += 1
+            right -= 1
+        elif sum < x:
+            left += 1
+        else:
+            right -= 1
+
+
+    print(count)
+
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
diff --git "a/live8/test90/\353\254\270\354\240\2342/\353\260\261\355\225\234\352\262\260.py" "b/live8/test90/\353\254\270\354\240\2342/\353\260\261\355\225\234\352\262\260.py"
new file mode 100644
index 00000000..69c60906
--- /dev/null
+++ "b/live8/test90/\353\254\270\354\240\2342/\353\260\261\355\225\234\352\262\260.py"
@@ -0,0 +1,27 @@
+from itertools import *
+
+
+def main():
+
+    # 백트래킹을 이용한 방법
+    N, M = map(int, input().split())
+
+    def backtrack(start, sequence):
+        if len(sequence) == M:
+            print(' '.join(map(str, sequence)))
+            return
+
+        for i in range(start, N+1):
+            backtrack(i+1, sequence+[i])
+
+    backtrack(1, [])
+
+    # combinations를 이용한 방법
+    N, M = map(int, input().split())
+
+    for c in combinations(range(1, N+1), M):
+        print(' '.join(map(str, c)))
+
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
diff --git "a/live8/test90/\353\254\270\354\240\2343/\353\260\261\355\225\234\352\262\260.py" "b/live8/test90/\353\254\270\354\240\2343/\353\260\261\355\225\234\352\262\260.py"
new file mode 100644
index 00000000..0ac15efd
--- /dev/null
+++ "b/live8/test90/\353\254\270\354\240\2343/\353\260\261\355\225\234\352\262\260.py"
@@ -0,0 +1,17 @@
+def solution(n, computers):
+    visited = [False] * n
+
+    def dfs(v):
+        visited[v] = True
+        for i in range(n):
+            if computers[v][i] == 1 and not visited[i]:
+                dfs(i)
+
+    count = 0
+
+    for i in range(n):
+        if not visited[i]:
+            dfs(i)
+            count += 1
+
+    return count
\ No newline at end of file