diff --git a/0001-two-sum/0001-two-sum.c b/0001-two-sum/0001-two-sum.c
new file mode 100644
index 0000000..f475f8b
--- /dev/null
+++ b/0001-two-sum/0001-two-sum.c
@@ -0,0 +1,24 @@
+/**
+ * Note: The returned array must be malloced, assume caller calls free().
+ */
+int* twoSum(int* nums, int numsSize, int target, int* returnSize) {
+
+    int* res = (int *)malloc(sizeof(int)*2);
+    *returnSize = 2;
+
+    for(int i=0; i<numsSize; i++){
+        for(int j=i+1; j<numsSize; j++){
+            int a = nums[i];
+            int b = nums[j];
+
+            if(a+b == target){
+                res[0]=i;
+                res[1]=j;
+                return res;
+            }
+        }
+    }
+
+    return res;
+    
+}
\ No newline at end of file