diff --git a/contains-duplicate/csucom.cpp b/contains-duplicate/csucom.cpp
new file mode 100644
index 000000000..18057c2f1
--- /dev/null
+++ b/contains-duplicate/csucom.cpp
@@ -0,0 +1,32 @@
+#include <malloc.h>
+#include <string.h>
+
+bool containsDuplicate(int* nums, int numsSize) {
+    char* pflag = (char*)malloc(1000000001);
+    char* mflag = (char*)malloc(1000000001);
+    memset(pflag, 0, 1000000001);
+    memset(mflag, 0, 1000000001);
+    for (int i = 0; i < numsSize; ++i) {
+        if (nums[i] < 0) {
+            if (mflag[-nums[i]] == 1) {
+                free(pflag);
+                free(mflag);
+                return true;
+            }
+            mflag[-nums[i]] = 1;
+        }
+        else {
+            if (pflag[nums[i]] == 1) {
+                free(pflag);
+                free(mflag);
+                return true;
+            }
+            pflag[nums[i]] = 1;
+        }
+    }
+    free(pflag);
+    free(mflag);
+    return false;
+}
+
+