diff --git a/main.ipynb b/main.ipynb
index 0a91670..3dcb09d 100644
--- a/main.ipynb
+++ b/main.ipynb
@@ -7,41 +7,96 @@
    "metadata": {},
    "outputs": [
     {
-     "ename": "IndexError",
-     "evalue": "list index out of range",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[31m---------------------------------------------------------------------------\u001b[39m",
-      "\u001b[31mIndexError\u001b[39m                                Traceback (most recent call last)",
-      "\u001b[36mCell\u001b[39m\u001b[36m \u001b[39m\u001b[32mIn[9]\u001b[39m\u001b[32m, line 6\u001b[39m\n\u001b[32m      2\u001b[39m \n\u001b[32m      3\u001b[39m count = []\n\u001b[32m      4\u001b[39m \n\u001b[32m      5\u001b[39m \u001b[38;5;28;01mfor\u001b[39;00m num \u001b[38;5;28;01min\u001b[39;00m nums:\n\u001b[32m----> \u001b[39m\u001b[32m6\u001b[39m     count[num] += \u001b[32m1\u001b[39m\n\u001b[32m      7\u001b[39m \n\u001b[32m      8\u001b[39m     \u001b[38;5;66;03m# 2. Делаем префиксную сумму\u001b[39;00m\n\u001b[32m      9\u001b[39m \u001b[38;5;28;01mfor\u001b[39;00m i \u001b[38;5;28;01min\u001b[39;00m range(\u001b[32m1\u001b[39m, \u001b[32m101\u001b[39m):\n",
-      "\u001b[31mIndexError\u001b[39m: list index out of range"
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2\n"
      ]
     }
    ],
    "source": [
-    "nums = [8,1,2,2,3,123,43,5,3,1,5,8,3,965,8,546,456,34,12,3]\n",
+    "gifts = [25,64,9,4,100]\n",
+    "k = 4\n",
     "\n",
-    "count = []\n",
+    "gift_s = sorted(gifts, inv)\n",
     "\n",
-    "for num in nums:\n",
-    "    if num in count:\n",
-    "        \n",
-    "    count[num] += 1\n",
-    "    \n",
-    "for i in range(1, 101):\n",
-    "    count[i] += count[i-1]\n",
-    "\n",
-    "result = []\n",
-    "for num in nums:\n",
-    "    if num == 0:\n",
-    "        result.append(0)\n",
-    "    else:\n",
-    "        result.append(count[num - 1])\n",
-    "\n",
-    "\n",
-    "\n",
-    "print(result)"
+    "for i \n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "903924a0",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'abc'"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "words = [\"alice\",\"bob\",\"charlie\"]\n",
+    "\n",
+    "s = \"\".join(i[:1] for i in words)\n",
+    "s"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "63d7c061",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0\n"
+     ]
+    }
+   ],
+   "source": [
+    "s = \"l|*e*et|c**o|*de|\"\n",
+    "\n",
+    "is_count = False\n",
+    "n = 0\n",
+    "for i in s:\n",
+    "    if i == '|' and is_count == False:\n",
+    "        is_count = True\n",
+    "    else:\n",
+    "        is_count = False\n",
+    "\n",
+    "    if i == '*' and is_count:\n",
+    "        n += 1\n",
+    "\n",
+    "\n",
+    "print(n)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5dcedb17",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'a'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": []
   }
  ],
  "metadata": {
@@ -60,7 +115,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.14.2"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,
diff --git a/solutions/lc2315.py b/solutions/lc2315.py
new file mode 100644
index 0000000..413e6a8
--- /dev/null
+++ b/solutions/lc2315.py
@@ -0,0 +1,14 @@
+class Solution:
+    def countAsterisks(self, s: str) -> int:
+        is_count = True
+        n = 0
+        for i in s:
+            if i == '|' and is_count == False:
+                is_count = True
+            elif i == '|' and is_count:
+                is_count = False
+
+            if i == '*' and is_count:
+                n += 1
+
+        return n
diff --git a/solutions/lc2828.py b/solutions/lc2828.py
new file mode 100644
index 0000000..d04ec5e
--- /dev/null
+++ b/solutions/lc2828.py
@@ -0,0 +1,3 @@
+class Solution:
+    def isAcronym(self, words: List[str], s: str) -> bool:
+        return True if s == "".join(i[:1] for i in words) else False
diff --git a/solutions/lc3931.py b/solutions/lc3931.py
new file mode 100644
index 0000000..50a96fb
--- /dev/null
+++ b/solutions/lc3931.py
@@ -0,0 +1,6 @@
+class Solution:
+    def isAdjacentDiffAtMostTwo(self, s: str) -> bool:
+        for i in range(1, len(s)):
+            if abs(int(s[i]) - int(s[i - 1])) > 2:
+                return False
+        return True
diff --git a/solutions/lc961.py b/solutions/lc961.py
new file mode 100644
index 0000000..4906ef7
--- /dev/null
+++ b/solutions/lc961.py
@@ -0,0 +1,9 @@
+class Solution:
+    def repeatedNTimes(self, nums: List[int]) -> int:
+        temp = []
+
+        for i in nums:
+            if i in temp:
+                return i
+            else:
+                temp.append(i)