import java.util.Scanner;
public class Main {
public static void main(String[] arg) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
sc.close();
int A = a*2-1;
int K = 1;
int B = a-1;
for(int i =1; i<=A; i++) {
if(i<=a){
for(int k =0; k<K; k++) {
System.out.print("*");
}
}
else {
for(int k=0; k<B; k++) {
System.out.print("*");
}
}
B--;
K++;
System.out.print("\n");
}
}
}
//https://codeup.kr/problem.php?id=1357 The problem is that the number of stars is increasing, but the B value is decreasing and the star is decreasing, but it is not decreasing. I'd appreciate it if you could explain why.
java loops
When input value is 5
A = 9
K = 1
B = 4
for i = 1; i <= A; i++
if i <= 5
for k = 0; k < K; k++
print "*"
else
for k = 0, k < B, k++
print "*"
B--
K++
print "\n"
So if you look at it, B keeps decreasing from 4 and then becomes -1 when you enter else. So fork = 0, k < B, k++ doesn't work at all.
Fix the point of decreasing B.
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