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public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int n = in.nextInt();
StringBuilder builder = new StringBuilder();
for (int i = 0; i <n ; i++)
builder.append(" ");
int j = 0;
for (int i = 1; i <=n; i++) {
builder.replace(builder.length()-i,
builder.length() - j, "#");
System.out.println(builder);
j++;
}
}
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Staircase
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Just that simple with JAVA StringBuilder