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292 lines (195 loc) · 4.9 KB
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package Lec9;
import java.lang.reflect.Array;
import java.util.ArrayList;
import javax.swing.plaf.synth.SynthSeparatorUI;
public class RecursionGet {
public static void main(String[] args) {
// TODO Auto-generated method stub
// System.out.println(keyPad("145"));
// System.out.println(permutation("abc"));
// System.out.println(boardPath(0, 10));
// System.out.println(mazePath(0, 0, 2, 2).size());
// System.out.println(mazePathMM(0, 0, 2, 2));
System.out.println(mazePathMM(0, 0, 3, 3));
System.out.println(coinToss(3));
}
public static ArrayList<String> subseq(String str) {
if (str.length() == 0) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
char ch = str.charAt(0);
String ros = str.substring(1);
ArrayList<String> rr = subseq(ros);
ArrayList<String> mr = new ArrayList<>();
for (String val : rr) {
mr.add(val);
mr.add(ch + val);
}
return mr;
}
public static ArrayList<String> subseqASCII(String str) {
if (str.length() == 0) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
char ch = str.charAt(0);
String ros = str.substring(1);
ArrayList<String> rr = subseqASCII(ros);
ArrayList<String> mr = new ArrayList<>();
for (String val : rr) {
mr.add(val);
mr.add(ch + val);
mr.add((int) ch + val);
}
return mr;
}
public static ArrayList<String> keyPad(String str) {
if (str.length() == 0) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
char ch = str.charAt(0);
String ros = str.substring(1);
ArrayList<String> rr = keyPad(ros);
String code = getCode(ch);
ArrayList<String> mr = new ArrayList<>();
for (int i = 0; i < code.length(); i++) {
char temp = code.charAt(i);
for (String val : rr) {
mr.add(temp + val);
}
}
return mr;
}
public static String getCode(char ch) {
if (ch == '1')
return "abc";
else if (ch == '2')
return "def";
else if (ch == '3')
return "ghi";
else if (ch == '4')
return "jk";
else if (ch == '5')
return "lmno";
else if (ch == '6')
return "pqr";
else if (ch == '7')
return "stu";
else if (ch == '8')
return "vwx";
else if (ch == '9')
return "yz";
else if (ch == '0')
return "@#";
else
return "";
}
public static ArrayList<String> permutation(String str) {
if (str.length() == 0) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
char ch = str.charAt(0);
String ros = str.substring(1);
ArrayList<String> rr = permutation(ros);
ArrayList<String> mr = new ArrayList<>();
for (String val : rr) {
for (int i = 0; i <= val.length(); i++) {
String temp = val.substring(0, i) + ch + val.substring(i);
mr.add(temp);
}
}
return mr;
}
public static ArrayList<String> boardPath(int curr, int end) {
if (curr == end) {
ArrayList<String> br = new ArrayList<>();
br.add("\n");
return br;
}
if (curr > end) {
ArrayList<String> br = new ArrayList<>();
return br;
}
ArrayList<String> mr = new ArrayList<>();
for (int dice = 1; dice <= 6 && curr + dice <= end; dice++) {
ArrayList<String> rr1 = boardPath(curr + dice, end);
for (String val : rr1) {
mr.add(dice + val);
}
}
return mr;
}
public static ArrayList<String> mazePath(int cr, int cc, int er, int ec) {
if (cr == er && cc == ec) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
ArrayList<String> mr = new ArrayList<>();
if (cc + 1 <= ec) {
ArrayList<String> rrH = mazePath(cr, cc + 1, er, ec);
for (String val : rrH) {
mr.add("H" + val);
}
}
if (cr + 1 <= er) {
ArrayList<String> rrV = mazePath(cr + 1, cc, er, ec);
for (String val : rrV) {
mr.add("V" + val);
}
}
return mr;
}
public static ArrayList<String> mazePathMM(int cr, int cc, int er, int ec) {
if (cr == er && cc == ec) {
ArrayList<String> br = new ArrayList<>();
br.add("\n");
return br;
}
if (cr > er || cc > ec) {
ArrayList<String> br = new ArrayList<>();
return br;
}
ArrayList<String> mr = new ArrayList<>();
for (int m = 1; m <= ec; m++) {
ArrayList<String> rrH = mazePathMM(cr, cc + m, er, ec);
for (String val : rrH) {
mr.add("H" + m + val);
}
}
for (int m = 1; m <= er; m++) {
ArrayList<String> rrV = mazePathMM(cr + m, cc, er, ec);
for (String val : rrV) {
mr.add("V" + m + val);
}
}
for (int m = 1; m <= er && m <= ec; m++) {
ArrayList<String> rrD = mazePathMM(cr + m, cc + m, er, ec);
for (String val : rrD) {
mr.add("D" + m + val);
}
}
return mr;
}
public static ArrayList<String> coinToss(int n) {
if (n == 0) {
ArrayList<String> br = new ArrayList<>();
br.add("");
return br;
}
ArrayList<String> rr = coinToss(n - 1);
ArrayList<String> mr = new ArrayList<>();
for (String val : rr) {
mr.add("H" + val);
mr.add("T" + val);
}
return mr;
}
}