Week 5 - CS50cdn.cs50.net/2016/fall/lectures/5/week5.pdf · typedef struct { int front; int...

Week 5

last time

environment variables

uninitialized data

initialized data

voidswap(inta,intb){inttmp=a;a=b;b=tmp;}

voidswap(int*a,int*b){inttmp=*a;*a=*b;*b=tmp;}

typedefstruct{stringname;stringdorm;}student;

this time

https://cs.calvin.edu/activities/books/c++/ds/1e/

http://cs.calvin.edu/books/c++/ds/1e/

typedefstructnode{intn;structnode*next;}node;

delete

insert

search

insert at tail

insert at head

insert in middle

remove tail

remove head

remove in middle

delete

insert

search

boolsearch(intn,node*list){node*ptr=list;while(ptr!=NULL){if(ptr->n==n){returntrue;}ptr=ptr->next;}returnfalse;}

typedefstruct{intnumbers[CAPACITY];intsize;}stack;

typedefstruct{int*numbers;intsize;}stack;

enqueue

dequeue

typedefstruct{intfront;intnumbers[CAPACITY];intsize;}queue;

typedefstruct{intfront;int*numbers;intsize;}queue;

environment variables

uninitialized data

initialized data

Figure by Larry Nyhoff.

22 33 44 55 66 77 88

Figure from http://cs.calvin.edu/books/c++/ds/1e/.

binary search tree

typedefstructnode{intn;structnode*left;structnode*right;}node;

boolsearch(intn,node*tree){if(tree==NULL){returnfalse;}elseif(n<tree->n){returnsearch(n,tree->left);}elseif(n>tree->n){returnsearch(n,tree->right);}else{returntrue;}}

A B C D E F G H I ...65 66 67 68 69 70 71 72 73 ...

Image adapted from Wikipedia.

morse code

Figure by Larry Nyhoff.

A is 01

B is 0000

C is 0001

D is 001

E is 1

typedefstructnode{charsymbol;floatfrequency;structnode*left;structnode*right;}node;

... O(n) O(log n) O(1) …

Figure from Lewis and Denenberg’s Data Structures & Their Algorithms.

typedefstructnode{boolword;structnode*children[27];}node;

Week 5

Week 5 - CS50cdn.cs50.net/2016/fall/lectures/5/week5.pdf · typedef struct { int front; int...

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