diff --git "a/2209040003/chap1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp" "b/2209040003/chap1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..78cc2c155765c4ee88409fa3fe64f2807d172929
--- /dev/null
+++ "b/2209040003/chap1/\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
@@ -0,0 +1,14 @@
+int* twoSum(int* nums, int numsSize, int target, int* returnSize) {
+    for (int i = 0; i < numsSize; ++i) {
+        for (int j = i + 1; j < numsSize; ++j) {
+            if (nums[i] + nums[j] == target) {
+                int* ret = malloc(sizeof(int) * 2);
+                ret[0] = i, ret[1] = j;
+                *returnSize = 2;
+                return ret;
+            }
+        }
+    }
+    *returnSize = 0;
+    return NULL;
+}
\ No newline at end of file
diff --git "a/2209040003/chap1/\345\245\207\346\225\260\344\271\213\345\222\214.cpp" "b/2209040003/chap1/\345\245\207\346\225\260\344\271\213\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..c3d9ef970247b40037e6c10082f37c8a540aa186
--- /dev/null
+++ "b/2209040003/chap1/\345\245\207\346\225\260\344\271\213\345\222\214.cpp"
@@ -0,0 +1,12 @@
+int sumOddLengthSubarrays(int* arr, int arrSize) {
+    int sum = 0;
+    for (int start = 0; start < arrSize; start++) {
+        for (int length = 1; start + length <= arrSize; 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