diff --git a/QUSTOJ/1720.c b/QUSTOJ/1720.c
new file mode 100644
index 0000000..70065b3
--- /dev/null
+++ b/QUSTOJ/1720.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char buff[64];
+
+int cnt[10];
+
+int main()
+{
+    int n;
+    scanf("%d",&n);
+    for(int i=1;i<=n;i++)
+    {
+        sprintf(buff,"%d",i);
+        int len=strlen(buff);
+        for(int j=0;j<len;j++)
+        {
+            ++cnt[buff[j]-'0'];
+        }
+    }
+    for(int i=0;i<9;i++)
+    {
+        printf("%d ",cnt[i]);
+    }
+    printf("%d\n",cnt[9]);
+    return 0;
+}