docs: update readme

Author: codejsha

README.md

@@ -5,6 +5,7 @@
 | Problem | Language | Title |
 | :------------------------ | :------------------------------------------------------------ | :------------------------------------------------------------------------------------------------------------------------------------ |
 | PROGRAMMERS-1844 |[python](coding-test-python-practice/src/problem1844)|[게임 맵 최단거리 (The Shortest Distance on Game Map)](https://school.programmers.co.kr/learn/courses/30/lessons/1844)|
+| PROGRAMMERS-12904 |[c++](coding-test-cpp-practice/src/problem12904)|[가장 긴 팰린드롬 (Longest Palindrome)](https://school.programmers.co.kr/learn/courses/30/lessons/12904)|
 | PROGRAMMERS-12909 :star:|[java](coding-test-java-practice/src/main/java/problem12909)|[올바른 괄호 (A Correct Parentheses)](https://school.programmers.co.kr/learn/courses/30/lessons/12909)|
 | PROGRAMMERS-12911 |[java](coding-test-java-practice/src/main/java/problem12911)|[다음 큰 숫자 (Next Big Number)](https://school.programmers.co.kr/learn/courses/30/lessons/12911)|
 | PROGRAMMERS-12913 |[java](coding-test-java-practice/src/main/java/problem12913)|[땅따먹기 (Hopscotch)](https://school.programmers.co.kr/learn/courses/30/lessons/12913)|
@@ -54,5 +55,7 @@
 | PROGRAMMERS-92335 |[java](coding-test-java-practice/src/main/java/problem92335)|[k진수에서 소수 개수 구하기 (Counting Primes in k-Base)](https://school.programmers.co.kr/learn/courses/30/lessons/92335)|
 | PROGRAMMERS-131127 |[java](coding-test-java-practice/src/main/java/problem131127)|[할인 행사 (Discount Events)](https://school.programmers.co.kr/learn/courses/30/lessons/131127)|
 | PROGRAMMERS-131701 :star:|[java](coding-test-java-practice/src/main/java/problem131701)|[연속 부분 수열 합의 개수 (Number of Consecutive Subsequence Sums)](https://school.programmers.co.kr/learn/courses/30/lessons/131701)|
+| PROGRAMMERS-132265 |[c++](coding-test-cpp-practice/src/problem132265)|[롤케이크 자르기 (Cutting Roll Cake)](https://school.programmers.co.kr/learn/courses/30/lessons/132265)|
 | PROGRAMMERS-138476 |[java](coding-test-java-practice/src/main/java/problem138476)|[귤 고르기 (Picking Tangerines)](https://school.programmers.co.kr/learn/courses/30/lessons/138476)|
+| PROGRAMMERS-154538 |[c++](coding-test-cpp-practice/src/problem154538)|[숫자 변환하기 (Number Conversion)](https://school.programmers.co.kr/learn/courses/30/lessons/154538)|
 | PROGRAMMERS-154539 |[java](coding-test-java-practice/src/main/java/problem154539)|[뒤에 있는 큰 수 찾기 (Find the Larger Number Behind)](https://school.programmers.co.kr/learn/courses/30/lessons/154539)|