diff --git "a/leetcode3/\354\227\274\355\230\234\354\240\225/3833. Count Dominant Indices.java" "b/leetcode3/\354\227\274\355\230\234\354\240\225/3833. Count Dominant Indices.java"
new file mode 100644
index 00000000..dc257113
--- /dev/null
+++ "b/leetcode3/\354\227\274\355\230\234\354\240\225/3833. Count Dominant Indices.java"	
@@ -0,0 +1,19 @@
+// nums[0] ~ nums[length -1] 합으로 평균을 구함
+// O(n)
+
+class Solution {
+    public int dominantIndices(int[] nums) {
+        if (nums.length == 1) return 0;
+
+        int sum = 0;
+        for (int i = 0; i<nums.length; i++) sum += nums[i];
+
+        int cnt = 0;
+        for (int i = 0; i<nums.length-1; i++) {
+            sum -= nums[i];
+            float avg = sum / (nums.length - i - 1);
+            if (nums[i] > avg) cnt++;
+        }
+        return cnt;
+    }
+}
diff --git "a/leetcode3/\354\227\274\355\230\234\354\240\225/877. Stone Game.java" "b/leetcode3/\354\227\274\355\230\234\354\240\225/877. Stone Game.java"
new file mode 100644
index 00000000..f50c98f7
--- /dev/null
+++ "b/leetcode3/\354\227\274\355\230\234\354\240\225/877. Stone Game.java"	
@@ -0,0 +1,5 @@
+class Solution {
+    public boolean stoneGame(int[] piles) {
+        return true;
+    }
+}