paizaラーニングレベルアップ問題集の「約数の個数」「約数の列挙」をやってみました。

問題

約数の個数

約数の列挙

方針

$i=1,\dots,N$について、$N\%i=0$ならば$i$は$N$の約数です。

C

約数の個数

#include <stdio.h>

int main() {
	int n;
	scanf("%d", &n);
	int count = 0;
	for (int i = 1; i <= n; i++) if (n % i == 0) count++;
	printf("%d\n", count);
	return 0;
}

約数の列挙

#include <stdio.h>

int main() {
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) if (n % i == 0) printf("%d\n", i);
	return 0;
}

C++

約数の個数

#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	int count = 0;
	for (int i = 1; i <= n; i++) if (n % i == 0) count++;
	cout << count << endl;
	return 0;
}

約数の列挙

#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) if (n % i == 0) cout << i << endl;
	return 0;
}

C#

約数の個数

using System;

class Program
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());
		int count = 0;
		for (int i = 1; i <= n; i++) if (n % i == 0) count++;
		Console.WriteLine(count);
	}
}

約数の列挙

using System;

class Program
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());
		int count = 0;
		for (int i = 1; i <= n; i++) if (n % i == 0) Console.WriteLine(i);
	}
}

Go

約数の個数

package main
import "fmt"

func main() {
	var n int
	fmt.Scan(&n)
	count := 0
	for i := 1; i <= n; i++ {
		if n % i == 0 {
			count++
		}
	}
	fmt.Println(count)
}

約数の列挙

package main
import "fmt"

func main() {
	var n int
	fmt.Scan(&n)
	for i := 1; i <= n; i++ {
		if n % i == 0 {
			fmt.Println(i)
		}
	}
}

Java

約数の個数

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		int count = 0;
		for (int i = 1; i <= n; i++) if (n % i == 0) count++;
		System.out.println(count);
	}
}

約数の列挙

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		for (int i = 1; i <= n; i++) if (n % i == 0) System.out.println(i);
	}
}

JavaScript

約数の個数

const n = Number(require("fs").readFileSync("/dev/stdin", "utf8"));
let count = 0;
for (var i = 1; i <= n; i++) if (n % i === 0) count++;
console.log(count);

約数の列挙

const n = Number(require("fs").readFileSync("/dev/stdin", "utf8"));
for (var i = 1; i <= n; i++) if (n % i === 0) console.log(i);

Kotlin

約数の個数

fun main() {
	val n = readLine()!!.toInt()
	var count = 0
	for (i in 1..n) if (n % i == 0) count++
	println(count)
}

約数の列挙

fun main() {
	val n = readLine()!!.toInt()
	for (i in 1..n) if (n % i == 0) println(i)
}

PHP

約数の個数

<?php
	$n = intval(fgets(STDIN));
	$count = 0;
	for ($i = 1; $i <= $n; $i++) if ($n % $i === 0) $count++;
	echo $count, PHP_EOL;
?>

約数の列挙

<?php
	$n = intval(fgets(STDIN));
	for ($i = 1; $i <= $n; $i++) if ($n % $i === 0) echo $i, PHP_EOL;
?>

Perl

約数の個数

my $n = int(<STDIN>);
my $count = 0;
for my $i (1..$n) {
	if ($n % $i == 0) {
		$count++;
	}
}
print "$count$/";

約数の列挙

my $n = int(<STDIN>);
for my $i (1..$n) {
	if ($n % $i == 0) {
		print "$i$/";
	}
}

Python3

約数の個数

N = int(input())
count = 0
for i in range(1, N + 1):
	if N % i == 0:
		count += 1
print(count)

約数の列挙

N = int(input())
for i in range(1, N + 1):
	if N % i == 0:
		print(i)

Ruby

約数の個数

N = gets.to_i
count = 0
(1..N).each do |i|
	if N % i == 0
		count += 1
	end
end
p count

約数の列挙

N = gets.to_i
(1..N).each do |i|
	if N % i == 0
		p i
	end
end

Scala

約数の個数

import scala.io.StdIn._

object Main extends App{
	val n = readInt()
	var count = 0
	for (i <- 1 to n) if (n % i == 0) count += 1
	println(count)
}

約数の列挙

import scala.io.StdIn._

object Main extends App{
	val n = readInt()
	for (i <- 1 to n) if (n % i == 0) println(i)
}

Swift

約数の個数

let n = Int(readLine()!)!
var count = 0
for i in 1...n {
	if n % i == 0 {
		count += 1
	}
}
print(count)

約数の列挙

let n = Int(readLine()!)!
for i in 1...n {
	if n % i == 0 {
		print(i)
	}
}