add PROGRAMMERS-17687

Author: codejsha

README.md

@@ -24,6 +24,7 @@
 | PROGRAMMERS-17677         | [java](programmers/problem17677)   | [뉴스 클러스터링 (News Clustering)](https://school.programmers.co.kr/learn/courses/30/lessons/17677)                                  |
 | PROGRAMMERS-17680         | [java](programmers/problem17680)   | [캐시 (Cache)](https://school.programmers.co.kr/learn/courses/30/lessons/17680)                                                       |
 | PROGRAMMERS-17684         | [java](programmers/problem17684)   | [압축 (Compression)](https://school.programmers.co.kr/learn/courses/30/lessons/17684)                                                 |
+| PROGRAMMERS-17687         | [java](programmers/problem17687)   | [n진수 게임 (n-base Game)](https://school.programmers.co.kr/learn/courses/30/lessons/17687)                                           |
 | PROGRAMMERS-42577         | [java](programmers/problem42577)   | [전화번호 목록 (List of Phone Numbers)](https://school.programmers.co.kr/learn/courses/30/lessons/42577)                              |
 | PROGRAMMERS-42578         | [python](programmers/problem42578) | [의상 (Clothes)](https://school.programmers.co.kr/learn/courses/30/lessons/42578)                                                     |
 | PROGRAMMERS-42586         | [java](programmers/problem42586)   | [기능개발 (Function Development)](https://school.programmers.co.kr/learn/courses/30/lessons/42586)                                    |

programmers/problem17687/NBaseGame.java

@@ -0,0 +1,42 @@
+package problem17687;
+
+public class NBaseGame {
+    public static void main(String[] args) {
+        var sol = new NBaseGame();
+        var n1 = 16;
+        var t1 = 16;
+        var m1 = 2;
+        var p1 = 1;
+        var expected1 = "0111";
+        var result1 = sol.solution(n1, t1, m1, p1);
+        System.out.println("expected: " + expected1 + ", result: " + result1);
+    }
+
+    /**
+     * find n-th output of p
+     *
+     * @param n base
+     * @param t number
+     * @param m players
+     * @param p tube (target player)
+     * @return output
+     */
+    public String solution(int n, int t, int m, int p) {
+        var sb = new StringBuilder();
+
+        int index = 0;
+        while (sb.length() < m * t) {
+            sb.append(Integer.toString(index, n).toUpperCase());
+            index++;
+        }
+
+        var answer = new StringBuilder();
+        int pIndex = p - 1;
+        for (int i = 0; i < t; i++) {
+            answer.append(sb.charAt(pIndex));
+            pIndex += m;
+        }
+
+        return answer.toString();
+    }
+}