diff --git "a/2225010064/chapter1/lc_1\344\270\244\346\225\260\344\271\213\345\222\214.cpp" "b/2225010064/chapter1/lc_1\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..2781a7955cd4be482a7592c919fd5a4f8d37f89e
--- /dev/null
+++ "b/2225010064/chapter1/lc_1\344\270\244\346\225\260\344\271\213\345\222\214.cpp"
@@ -0,0 +1,17 @@
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+    int i,j;
+        for(i=0;i<nums.size()-1;i++)
+        {
+            for(j=i+1;j<nums.size();j++)
+            {
+                if(nums[i]+nums[j]==target)
+                {
+                   return {i,j};
+                }
+            }
+        }
+        return {i,j};
+    };
+};
\ No newline at end of file
diff --git "a/2225010064/chapter1/lc_\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/2225010064/chapter1/lc_\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..ed8fd56c76af4344ce59b96b032a76a779cb3aba
--- /dev/null
+++ "b/2225010064/chapter1/lc_\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 +1,24 @@
+int arrSum(int* arr, int start, int end){
+	int i, res = 0;
+	for(i = start; i < start + end; i++)
+	{
+		res += arr[i];
+	}
+	
+	return res;
+}
+int sumOddLengthSubarrays(int* arr, int arrSize){
+    int i = 0;
+    int j = 0;
+    int k = 0;
+    int ans = 0;
+
+    for(i = 1; i <= arrSize; i += 2){
+        for(j = 0; j < i; j += i){
+            for(k = j; k < arrSize - i + 1;k++){
+                ans += arrSum(arr, k ,i);
+            }
+        }
+    }
+    return ans;
+}
\ No newline at end of file