diff --git a/QUSTOJ/1750.c b/QUSTOJ/1750.c
new file mode 100644
index 0000000..8cf9f20
--- /dev/null
+++ b/QUSTOJ/1750.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+ 
+ 
+int a[1024];
+int b[1024];
+int c[1024];
+ 
+ 
+int cmp(const void* a,const void* b)
+{
+    return *(int*)a-*(int*)b;
+}
+ 
+int main()
+{
+    int n,m;
+    scanf("%d",&n);
+    for(int i=0;i<n;i++)
+    {
+        scanf("%d",&a[i]);
+    }
+    scanf("%d",&m);
+    for(int i=0;i<m;i++)
+    {
+        scanf("%d",&b[i]);
+    }
+    qsort(a,n,sizeof(int),cmp);
+    qsort(b,m,sizeof(int),cmp);
+    int ia=0;
+    int ib=0;
+    int ic=0;
+    while(ia<n&&ib<m)
+    {
+        if(a[ia]==b[ib])
+        {
+            c[ic]=a[ia];
+            ++ic;
+            ++ia,++ib;
+            continue;
+        }
+        else if(a[ia]<b[ib])
+        {
+            ++ia;
+            continue;
+        }
+        else if(a[ia]>b[ib])
+        {
+            ++ib;
+            continue;
+        }
+    }
+    if(ic<1)
+    {
+        printf("空集\n");
+        return 0;
+    }
+    for(int i=0;i<ic-1;i++)
+    {
+        printf("%d ",c[i]);
+    }
+    return printf("%d\n",c[ic-1]),0;
+}