-
Notifications
You must be signed in to change notification settings - Fork 0
/
67. Add Binary.ts
60 lines (49 loc) · 1.42 KB
/
67. Add Binary.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
function addBinary(a: string, b: string): string {
let result = "";
let carry = "0";
const larger = (a.length >= b.length) ? a : b;
let smaller = (a.length < b.length) ? a : b;
const diffLength = larger.length - smaller.length;
// make length of smaller string be equal to the larger string
let diff = "0".repeat(diffLength);
smaller = diff + smaller;
for (let i = larger.length-1; i >= 0; i--) {
const sumResult = sumBinaryWithCarry(larger[i], smaller[i], carry);
result = sumResult.result + result;
carry = sumResult.resultCarry;
}
if(carry === "1") {
result = carry + result;
}
return result;
}
function sumBinaryWithCarry(
firstDigit: string,
secondDigit: string,
carry: string
): SumCasesResult {
let result = "0";
let resultCarry = "0";
if (firstDigit === "1" && secondDigit === "1" && carry === "1") {
result = "1";
resultCarry = "1";
} else if (firstDigit === "0" && secondDigit === "0" && carry === "0") {
result = "0";
resultCarry = "0";
} else if (
(firstDigit === "0" && secondDigit === "1" && carry === "1") ||
(firstDigit === "1" && secondDigit === "0" && carry === "1") ||
(firstDigit === "1" && secondDigit === "1" && carry === "0")
) {
result = "0";
resultCarry = "1";
} else {
result = "1";
resultCarry = "0";
}
return { result, resultCarry };
}
interface SumCasesResult {
result: string;
resultCarry: string;
}