Interview Question

Software Engineer (Site Reliability) Interview

-Houston, TX


Given a string, return true if after jumbling/rearranging the characters of the string will it be a palindrome. and false if not. eg: given string "evlel", it can be rearranged to "level" and thus it is a palindrome, and return true. eg: 1234 cannot be rearranged to become a palindrome hence false.

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4 Answers


A palindrome is a word that has the same spelling forward and backwards. “1234” are numbers and cannot be a palindrome.

Anonymous on


“acrecar” is a palindrome by that definition of the word, “racecar”, “dad”, “pop”, “poop”. These I feel like may be better examples. “454” would be an example of a palindrome that is a number.

Anonymous on


This solution uses an unordered map to be O(n) #include #include #include int main() { std::unordered_map map; const std::string test = "aabbbaaccc"; for(size_t i = 0; i ::const_iterator it = map.begin(); it != map.end(); ++it) { if (it->second % 2 != 0) { oddNumber++; if (oddNumber > 1) { std::cout << "Not palindrome" << std::endl; return -1; } } } std::cout << "Palindrome" << std::endl; return 0; }

Lorenzo on


Count the occurrence of each character; if more than one char has odd number of occurrences, it’s false

Anonymous on

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