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

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

|1844|[Replace All Digits with Characters](https://leetcode.com/problems/replace-all-digits-with-characters//)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1844.java)||Easy|String|

|1845|[Seat Reservation Manager](https://leetcode.com/problems/seat-reservation-manager/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1845.java)||Medium|Heap, Design|

|1844|[Replace All Digits with Characters](https://leetcode.com/problems/replace-all-digits-with-characters/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1844.java)||Easy|String|

|1837|[Sum of Digits in Base K](https://leetcode.com/problems/sum-of-digits-in-base-k/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1837.java)||Easy|Math, Bit Manipulation|

|1833|[Maximum Ice Cream Bars](https://leetcode.com/problems/maximum-ice-cream-bars/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1833.java)||Medium|Array, Sort|

|1832|[Check if the Sentence Is Pangram](https://leetcode.com/problems/check-if-the-sentence-is-pangram/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1832.java)||Easy|String|

packagecom.fishercoder.solutions;

publicclass_1845 {

publicstaticclassSolution1 {

classSeatManager {

boolean[]seats;

intnext;

publicSeatManager(intn) {

seats =newboolean[n +1];

next =1;

}

publicintreserve() {

seats[next] =true;

inttmp =next;

while (next <seats.length &&seats[next]) {

next++;

}

returntmp;

}

publicvoidunreserve(intseatNumber) {

seats[seatNumber] =false;

if (next >seatNumber) {

next =seatNumber;

}

}

}

}

}