diff --git "a/2209040042/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.c" "b/2209040042/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.c"
new file mode 100644
index 0000000000000000000000000000000000000000..e68ff10fe92917b0f4c0ac91b2df9e7f371c1085
--- /dev/null
+++ "b/2209040042/chapter1/\344\270\244\346\225\260\344\271\213\345\222\214.c"
@@ -0,0 +1,18 @@
+int* twoSum(int* nums, int numsSize, int target, int* returnSize){
+    int i,j;
+    *returnSize=2;
+    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;
+                return a;
+            }
+        }
+    }
+    return 0;
+}
\ No newline at end of file
diff --git "a/2209040042/chapter1/\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.c" "b/2209040042/chapter1/\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.c"
new file mode 100644
index 0000000000000000000000000000000000000000..7f361ed8a3b6451a2c8b8bdf89ced11ec17d106a
--- /dev/null
+++ "b/2209040042/chapter1/\345\245\207\346\225\260\345\255\220\351\233\206\346\261\202\345\222\214.c"
@@ -0,0 +1,16 @@
+int sumOddLengthSubarrays(int* arr, int arrSize){
+   int sum=0;
+    for(int size=1;size<=arrSize;size+=2)
+        {
+            for(int start=0;start+size<=arrSize;start++)
+            {
+                int k=start;
+                for(int i=0;i<size;i++)
+                {
+                    sum+=arr[k];
+                    k++;
+                }
+            }
+        }
+        return sum;
+}
\ No newline at end of file