diff --git "a/2224020087/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp" "b/2224020087/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..a46398c00c696f5160c2aa417447e99aa34ebe72
--- /dev/null
+++ "b/2224020087/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
@@ -0,0 +1,14 @@
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+        int n = nums.size();
+        for (int i = 0; i < n; ++i) {
+            for (int j = i + 1; j < n; ++j) {
+                if (nums[i] + nums[j] == target) {
+                    return {i, j};
+                }
+            }
+        }
+        return {};
+    }
+};
\ No newline at end of file
diff --git "a/2224020087/chapter1/\346\211\200\346\234\211\345\245\207\346\225\260\351\225\277\345\272\246\347\232\204\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214.cpp" "b/2224020087/chapter1/\346\211\200\346\234\211\345\245\207\346\225\260\351\225\277\345\272\246\347\232\204\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..71613f189faeb792685230a908c4672b853813a3
--- /dev/null
+++ "b/2224020087/chapter1/\346\211\200\346\234\211\345\245\207\346\225\260\351\225\277\345\272\246\347\232\204\345\255\220\346\225\260\347\273\204\347\232\204\345\222\214.cpp"
@@ -0,0 +1,16 @@
+class Solution {
+public:
+    int sumOddLengthSubarrays(vector<int>& arr) {
+        int sum = 0;
+        int n = arr.size();
+        for (int start = 0; start < n; start++) {
+            for (int length = 1; start + length <= n; length += 2) {
+                int end = start + length - 1;
+                for (int i = start; i <= end; i++) {
+                    sum += arr[i];
+                }
+            }
+        }
+        return sum;
+    }
+};
\ No newline at end of file