Merge pull request #51 from AlgoLeadMe/16-YIM2UL2ET

16-YIM2UL2ET

YIM2UL2ET/README.md

@@ -17,4 +17,5 @@
 | 13차시 | 2024.04.01 |  BFS  | [BOJ 7569](https://www.acmicpc.net/problem/7569)  | [BOJ 7569 풀이](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/42) |
 | 14차시 | 2024.04.04 |  우선순위 큐  | [BOJ 11286](https://www.acmicpc.net/problem/11286)  | [BOJ 11286 풀이](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/43) |
 | 15차시 | 2024.04.09 |  구현  | [BOJ 14719](https://www.acmicpc.net/problem/14719)  | [BOJ 14719 풀이](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/48) |
+| 16차시 | 2024.04.09 |  구현  | [BOJ 15927](https://www.acmicpc.net/problem/15927)  | [BOJ 15927 풀이](https://github.com/AlgoLeadMe/AlgoLeadMe-7/pull/51) |
 ---

YIM2UL2ET/애드 혹/16차시 - BOJ 15927.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <algorithm>
+
+bool isOneChar(std::string str) {
+    int size = str.size();
+    for (int i = 1; i < size; i++) {
+        if (str[i-1] != str[i]) return false;
+    }
+    return true;
+}
+
+int main(void) {
+    std::string str, rstr;
+    std::cin >> str, rstr = str;
+    std::reverse(rstr.begin(), rstr.end());
+
+    if (isOneChar(str)) std::cout << -1;
+    else if (str == rstr) std::cout << str.size()-1;
+    else std::cout << str.size();
+
+    return 0;
+}