ListNode* reverseKGroup(ListNode* head, int k) {
if(head == NULL)
return head;
ListNode myhead(-1);
myhead.next=head;
ListNode* rear=head;
for(int i=1;i<k && rear!=NULL;i++)
rear=rear->next;
if(rear==NULL)
return head;
ListNode* prev= &myhead;
ListNode* next=rear->next;
ListNode* front=head;
while(rear!=NULL){
swap(front,rear);
prev->next=rear;
front->next=next;
prev=front;
front=next;
rear=next;
for(int i=1;i<k && rear!=NULL;i++)
rear=rear->next;
if(rear!=NULL)
next=rear->next;
}
return myhead.next;
}
int main(int argc, char** argv)
{
int count=0, i=0, cmp, j, valid=0;
char key[MAX];
//run the shell till user inputs 'quit' or Ctrl-C
while(strcmp(cmdline, "quit") != 0)
{
count = 0;
//our shell's prompt
printf("afreen@myShell $ ");
//get command line input
gets(cmdline);
//tokenize the CL input delimited by " " using strtok() into args
args[count++] = strtok(cmdline, " ");
//tokenize the entire string till the next token encountered
//does not have a NULL pointer
while((args[count++] = strtok(NULL, " ")));
count--; //no of arguments (argc)
//if user wants to clear screen
if(strcmp(args[0], "clear") == 0)
{
myclear();
}
//checking for the input command
strcpy(key, args[0]);
for(i=0; i<18; i++) //look through our check array for command
{
if(strcmp(check[i], key) == 0)
{
valid = -1;
switch(i)
{
case 0: mycat(count, args);
break;
case 1: mycd(count, args);
break;
case 2: mycp(count, args);
break;
case 3: mydate(count, args);
break;
case 4: myhead(count, args);
break;
case 5: myls(count, args);
break;
case 6: myll(count, args);
break;
case 7: myln(count, args);
break;
case 8: myld(count, args);
break;
case 9: mymkdir(count, args);
break;
case 10: mymv(count, args);
break;
case 11: mypwd(count, args);
break;
case 12: myrm(count, args);
break;
case 13: myrmdir(count, args);
break;
case 14: mytail(count, args);
break;
case 15: mytime(count, args);
break;
case 16: mytouch(count, args);
break;
case 17: myuname(count, args);
break;
default: printf("%s: Command not found\n", key);
break;
}
break;
}
}
}
return 0;
}
