Tasks Details
easy
1.
CountFactors
Count factors of given number n.
Task Score
100%
Correctness
100%
Performance
100%
A positive integer D is a factor of a positive integer N if there exists an integer M such that N = D * M.
For example, 6 is a factor of 24, because M = 4 satisfies the above condition (24 = 6 * 4).
Write a function:
function solution(N);
that, given a positive integer N, returns the number of its factors.
For example, given N = 24, the function should return 8, because 24 has 8 factors, namely 1, 2, 3, 4, 6, 8, 12, 24. There are no other factors of 24.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..2,147,483,647].
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used JavaScript
Time spent on task 7 minutes
Notes
not defined yet
Code: 14:14:09 UTC,
java,
autosave
Code: 14:16:03 UTC,
js,
autosave
Code: 14:16:18 UTC,
js,
autosave
Code: 14:16:48 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
for (let i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
}
Code: 14:17:18 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
for (let i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return
}
Code: 14:17:28 UTC,
js,
verify,
result: Failed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
for (let i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Analysis
expand all
Example tests
1.
0.072 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
ReferenceError: i is not defined
at solution (solution.js:15:5)
at solutionWrapper (/tmp/exec.js:394:28)
at Promise.resolve.then (/tmp/exec.js:420:24)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
at Function.Module.runMain (module.js:686:11)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
Code: 14:17:48 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:17:49 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Analysis
Code: 14:18:01 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:18:30 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
User test case 1:
[1]
User test case 2:
[2]
User test case 3:
[12]
User test case 4:
[7]
User test case 5:
[49]
User test case 6:
[15]
User test case 7:
[2147483647]
Analysis
expand all
User tests
1.
0.068 s
OK
function result: 1
function result: 1
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.068 s
OK
function result: 6
function result: 6
1.
0.068 s
OK
function result: 2
function result: 2
1.
0.068 s
OK
function result: 3
function result: 3
1.
0.068 s
OK
function result: 4
function result: 4
1.
0.072 s
OK
function result: 2
function result: 2
Code: 14:18:45 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:18:53 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
User test case 1:
[1]
User test case 2:
[2]
User test case 3:
[12]
User test case 4:
[7]
User test case 5:
[49]
User test case 6:
[15]
User test case 7:
[2147483647]
User test case 8:
[2147483646]
Analysis
expand all
User tests
1.
0.072 s
OK
function result: 1
function result: 1
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 6
function result: 6
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 3
function result: 3
1.
0.072 s
OK
function result: 4
function result: 4
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.076 s
OK
function result: 192
function result: 192
Code: 14:19:23 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:19:30 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
if (N === 1) {
return 1;
}
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
User test case 1:
[1]
User test case 2:
[2]
User test case 3:
[12]
User test case 4:
[7]
User test case 5:
[49]
User test case 6:
[15]
User test case 7:
[81]
User test case 8:
[2147483647]
User test case 9:
[2147483646]
Analysis
expand all
User tests
1.
0.072 s
OK
function result: 1
function result: 1
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 6
function result: 6
1.
0.068 s
OK
function result: 2
function result: 2
1.
0.068 s
OK
function result: 3
function result: 3
1.
0.068 s
OK
function result: 4
function result: 4
1.
0.068 s
OK
function result: 5
function result: 5
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 192
function result: 192
Code: 14:20:10 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
// if (N === 1) {
// return 1;
// }
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:20:13 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
// if (N === 1) {
// return 1;
// }
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
User test case 1:
[1]
User test case 2:
[2]
User test case 3:
[12]
User test case 4:
[7]
User test case 5:
[49]
User test case 6:
[15]
User test case 7:
[81]
User test case 8:
[2147483647]
User test case 9:
[2147483646]
Analysis
expand all
User tests
1.
0.072 s
OK
function result: 1
function result: 1
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 6
function result: 6
1.
0.072 s
OK
function result: 2
function result: 2
1.
0.072 s
OK
function result: 3
function result: 3
1.
0.072 s
OK
function result: 4
function result: 4
1.
0.072 s
OK
function result: 5
function result: 5
1.
0.076 s
OK
function result: 2
function result: 2
1.
0.076 s
OK
function result: 192
function result: 192
Code: 14:20:23 UTC,
js,
autosave
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Code: 14:20:29 UTC,
js,
verify,
result: Passed
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
User test case 1:
[1]
User test case 2:
[2]
User test case 3:
[12]
User test case 4:
[7]
User test case 5:
[49]
User test case 6:
[15]
User test case 7:
[81]
User test case 8:
[2147483647]
User test case 9:
[2147483646]
Analysis
expand all
User tests
1.
0.076 s
OK
function result: 1
function result: 1
1.
0.076 s
OK
function result: 2
function result: 2
1.
0.076 s
OK
function result: 6
function result: 6
1.
0.076 s
OK
function result: 2
function result: 2
1.
0.076 s
OK
function result: 3
function result: 3
1.
0.076 s
OK
function result: 4
function result: 4
1.
0.076 s
OK
function result: 5
function result: 5
1.
0.080 s
OK
function result: 2
function result: 2
1.
0.076 s
OK
function result: 192
function result: 192
Code: 14:20:32 UTC,
js,
final,
score:
100
// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(N) {
// write your code in JavaScript (Node.js 8.9.4)
let count = 0;
let i;
for (i = 1; i * i < N; i++) {
if (N % i === 0) {
count += 2;
}
}
if (i * i === N) {
count += 1;
}
return count;
}
Analysis summary
The solution obtained perfect score.
Analysis
Detected time complexity:
O(sqrt(N))
expand all
Correctness tests
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
4.
0.068 s
OK
5.
0.072 s
OK
6.
0.068 s
OK
7.
0.068 s
OK
8.
0.068 s
OK
9.
0.068 s
OK
10.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
1.
0.068 s
OK
expand all
Performance tests
1.
0.068 s
OK
2.
0.072 s
OK
1.
0.068 s
OK
2.
0.068 s
OK
3.
0.072 s
OK
1.
0.072 s
OK
2.
0.068 s
OK
3.
0.068 s
OK
1.
0.068 s
OK
2.
0.072 s
OK
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.072 s
OK
1.
0.072 s
OK
2.
0.072 s
OK
3.
0.072 s
OK