AlgorithmStudy_Java/src/hackerrank/Staircase.java at master · flanoer/AlgorithmStudy_Java

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package hackerrank;

public class Staircase {

static void staircase(int n) {

//sol1

for (int i = 1; i <= n; i++) {

System.out.print(new String(new char[n - i]).replace("\0", " "));

System.out.println(new String(new char[i]).replace("\0", "#"));

}

//sol2

System.out.println("---sol2");

int star = 1, space = n - 1;

while (n > 0) {

for (int i = 0; i < space; i++) {

System.out.print(" ");

}

for (int i = 0; i < star; i++) {

System.out.print("#");

}

star = star + 1;

space = space - 1;

--n;

System.out.println("");

}

//sol3

System.out.println("---sol3");

StringBuilder sb = new StringBuilder(n);

String fmt = "%" + n + "s\n";

for (int i = 1; i <= n; i++) {

sb.append('#');

System.out.printf(fmt, sb);

}

public static void main(String[] args) {

staircase(6);

}