This is CS50

1.

This is CS50

2.

2/3
of CS50 students have never taken CS before

3.

what ultimately matters in this course is not so much where
you end up relative to your classmates but where
you end up relative to yourself when you began

4.

input →
→ output

5.

representation

6.

7.

0123456789

8.

01

9.

123

10.

1
123

11.

10
1
123

12.

100
10
1
123

13.

100
10
1
123
100 × 1

14.

100
10
1
123
100 × 1
+

15.

100
10
1
123
100 × 1
+
10 × 2

16.

100
10
1
123
100 × 1
+
10 × 2
+

17.

100
10
1
123
100 × 1
+
10 × 2
+
1×3

18.

100
10
1
123
100
+
20
+
3

19.

123

20.

100
10
1
000

21.

100
10
1
001

22.

100
10
1
002

23.

100
10
1
003

24.

100
10
1
004

25.

100
10
1
005

26.

100
10
1
006

27.

100
10
1
007

28.

100
10
1
008

29.

100
10
1
009

30.

100
10
1
010

31.

100
10
1
000

32.

102
101
100
000

33.

22
21
20
000

34.

4
2
1
000

35.

4
2
1
001

36.

4
2
1
010

37.

4
2
1
011

38.

4
2
1
100

39.

4
2
1
101

40.

4
2
1
110

41.

4
2
1
111

42.

bit

43.