diff --git a/delete.c b/delete.c
index 07bf675..d969d58 100644
--- a/delete.c
+++ b/delete.c
@@ -3,7 +3,7 @@
 void cancel(ss*stu){
   char* tmp = (char*)malloc(sizeof(char)*3);
     do{
-        char*ID = (char*)malloc(sizeof(char)*5);
+        char*ID = (char*)malloc(sizeof(char)*6);
         scanf("%s",ID);
         for(int i = 0; i < stu->nums; ++i){
             if(strcmp(stu->student[i].id,ID) == 0){
@@ -12,6 +12,7 @@ void cancel(ss*stu){
                 }
             }
         }
+        stu->nums--;
         allPrint(stu);
         printf("continue?\n");
         scanf("%s",tmp);
diff --git a/init.c b/init.c
index 80e20eb..704ec37 100644
--- a/init.c
+++ b/init.c
@@ -1,4 +1,4 @@
-#include "mysyslib.h"
+w#include "mysyslib.h"
 
  ss* init(int Nums){
      ss* stu = (ss*)malloc(sizeof(ss));
@@ -9,8 +9,8 @@
      if(!stu->student) return NULL;
 
      for(int i = 0; i < Nums; ++i){
-         stu->student[i].id = (char*)malloc(sizeof(char)*5);
-         stu->student[i].class = (char*)malloc(sizeof(char)*2);
+         stu->student[i].id = (char*)malloc(sizeof(char)*6);
+         stu->student[i].class = (char*)malloc(sizeof(char)*3);
          stu->student[i].name = (char*)malloc(sizeof(char)*10);
 
      }