1단계 2739번 구구단
import java.util.Scanner;
class Main{
public static void main(String []args){
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
for(int i=1; i<10; i++){
System.out.println(a+" * "+i+" = "+a*i);
}
}
}
2단계 10950번 A + b - 3
import java.util.Scanner;
class Main{
public static void main(String []args){
Scanner sc = new Scanner(System.in);
int c = sc.nextInt();
int a[] = new int[c];
int b[] = new int[c];
for(int i=0; i<c; i++){
a[i]= sc.nextInt();
b[i]= sc.nextInt();
}
for(int i=0; i<c; i++){
System.out.println(a[i]+b[i]);
}
}
}
3단계 8393번 합
import java.util.Scanner;
class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int tot = 0;
for(int i=n; i>0; i--)
tot += i;
System.out.println(tot);
}
}