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All you need to do is replace the character. Try this on for size.
int counter = 1;
StringBuilder sb = new StringBuilder(n);
for(int i = 0; i < n; i++){
sb.append(" ");
}
System.out.println(sb);
for (int i = 1; i <=n; i++) {
sb.setCharAt(n-counter,'#');
counter++;
System.out.println(sb);
}
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Staircase
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All you need to do is replace the character. Try this on for size.