diff --git "a/2209040029/chapter 1/ lc chapter1 \344\270\244\346\225\260\344\271\213\345\222\214.cpp" "b/2209040029/chapter 1/ lc chapter1 \344\270\244\346\225\260\344\271\213\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..d58d585d9abeedd27cd09ceee20661049b803ef5
--- /dev/null
+++ "b/2209040029/chapter 1/ lc chapter1 \344\270\244\346\225\260\344\271\213\345\222\214.cpp"	
@@ -0,0 +1,19 @@
+int* twoSum(int* nums, int numsSize, int target, int* returnSize)
+{
+int i=0,j=0;
+int *a=(int*)malloc(sizeof(int)*2);
+for(i=0;i<numsSize;i++)
+{
+for(j=i+1;j<numsSize;j++)
+{
+ if(nums[i]+nums[j]==target)
+ {
+a[0]=i;
+a[1]=j;
+* returnSize=2;
+break;
+ }
+}
+}
+return a;
+}
\ No newline at end of file
diff --git "a/2209040029/chapter 1/lc chapter1\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.cpp" "b/2209040029/chapter 1/lc chapter1\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..381f06556efd09c64d27ea15b24360cae8b9027e
--- /dev/null
+++ "b/2209040029/chapter 1/lc chapter1\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.cpp"	
@@ -0,0 +1,15 @@
+int sumOddLengthSubarrays(int* arr, int arrSize)
+{
+    int sum=0;
+    for(int i=0;i<arrSize;i++)
+     {  int n=(arrSize-i)%2==0?(arrSize-i)-1:arrSize-i;
+        for(int size=1;size<=n;size+=2)
+        {
+            for(int j=0;j<size;j++)
+            {
+                sum+=arr[i+j];
+            }
+        }
+    }
+    return sum;
+}
\ No newline at end of file