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Diffstat (limited to 'break_palindrom.c')
-rw-r--r-- | break_palindrom.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/break_palindrom.c b/break_palindrom.c new file mode 100644 index 0000000..2a1f428 --- /dev/null +++ b/break_palindrom.c @@ -0,0 +1,27 @@ +// 1328. Break a Palindrome +#include "leetcode.h" + +/* + * given a palindrome string of lowercase english letters 'palindrome' replace + * exactly one character with any lowercase english letter so that the resulting + * string is not a palindrome and that it is the lexicographically smallest one + * possible. return the resulting string. if there is no way to replace a + * character to make it not a palindrome, return an empty string. + */ + +char *breakPalindrome(char *palindrome) { + int n = strlen(palindrome); + for (int i = 0; i < n / 2; ++i) + if (palindrome[i] != 'a') { + palindrome[i] = 'a'; + return palindrome; + } + palindrome[n - 1] = 'b'; + return n < 2 ? "" : palindrome; +} + +int main() { + char p1[] = "abccba", p2[] = "a"; + printf("%s\n", breakPalindrome(p1)); // expect: aaccba + printf("%s\n", breakPalindrome(p2)); // expect: null +} |