| # | Title | Solutions | Video | Difficulty | Tag

|-----|----------------|---------------|--------|-------------|-------------

|1694|[Reformat Phone Number](https://leetcode.com/problems/reformat-phone-number/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1694.java)||Easy|String|

|1690|[Stone Game VII](https://leetcode.com/problems/stone-game-vii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1690.java)||Medium|DP|

|1688|[Count of Matches in Tournament](https://leetcode.com/problems/count-of-matches-in-tournament/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1688.java)||Easy|Backtracking|

|1685|[Sum of Absolute Differences in a Sorted Array](https://leetcode.com/problems/sum-of-absolute-differences-in-a-sorted-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1685.java)||Medium|Math, Greedy|

packagecom.fishercoder.solutions;

publicclass_1694 {

publicstaticclassSolution1 {

publicStringreformatNumber(Stringnumber) {

StringBuildersb =newStringBuilder();

for (charc :number.toCharArray()) {

if (Character.isDigit(c)) {

sb.append(c);

}

}

Stringcleaned =sb.toString();

sb.setLength(0);

for (inti =0;i <cleaned.length(); ) {

if (i +4 ==cleaned.length()) {

sb.append(cleaned.substring(i,i +2));

sb.append("-");

sb.append(cleaned.substring(i +2));

break;

}elseif (i +3 <=cleaned.length()) {

sb.append(cleaned.substring(i,i +3));

sb.append("-");

i +=3;

}else {

sb.append(cleaned.substring(i));

break;

}

}

if (sb.charAt(sb.length() -1) =='-') {

sb.setLength(sb.length() -1);

}

returnsb.toString();

}

}

}

packagecom.fishercoder;

importcom.fishercoder.solutions._1694;

importorg.junit.BeforeClass;

importorg.junit.Test;

importstaticorg.junit.Assert.assertEquals;

publicclass_1694Test {

privatestatic_1694.Solution1solution1;

publicstaticvoidsetup() {

solution1 =new_1694.Solution1();

}

publicvoidtest1() {

assertEquals("123-456",solution1.reformatNumber("1-23-45 6"));

}

publicvoidtest2() {

assertEquals("123-45-67",solution1.reformatNumber("123 4-567"));

}

publicvoidtest3() {

assertEquals("123-456-78",solution1.reformatNumber("123 4-5678"));

}

publicvoidtest4() {

assertEquals("12",solution1.reformatNumber("12"));

}

publicvoidtest5() {

assertEquals("175-229-353-94-75",solution1.reformatNumber("--17-5 229 35-39475 "));

}

}