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Make Palindrome

CF
600C1800· expert2s256 MB⌨ stdin/stdout
#constructive algorithms#greedy#strings

Examples

Sample 1of 2
Input
aabc
Output
abba
Sample 2of 2
Input
aabcd
Output
abcba
600C.cpp
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Ln 11·137 BGNU C++20 (64)