diff options
-rw-r--r-- | min_deletions_balance_str.c | 29 | ||||
-rw-r--r-- | min_deletions_balance_str.py | 31 |
2 files changed, 60 insertions, 0 deletions
diff --git a/min_deletions_balance_str.c b/min_deletions_balance_str.c new file mode 100644 index 0000000..6daeda1 --- /dev/null +++ b/min_deletions_balance_str.c @@ -0,0 +1,29 @@ +// 1653. Minimum Deletions to Make String Balanced +#include "leetcode.h" + +/* + * you are given a string 's' consisting of only characters 'a' and 'b'. you can + * delete any number of characters in 's' to make 's' balanced. 's' is balanced + * if there is no pair of indices '(i, j)' such that 'i < j' and 's[i] = b' and + * 's[j] = a'. return the minimum number of deletions needed to make 's' + * balanced. + */ + +int minimumDeletions(char *s) { + int cnt = 0, ans = 0; + for (int i = 0; s[i] != '\0'; i++) { + if (s[i] == 'b') { + cnt++; + } else if (cnt) { + ans++; + cnt--; + } + } + return ans; +} + +int main() { + char *s1 = "aababbab", *s2 = "bbaaaaabb"; + printf("%d\n", minimumDeletions(s1)); // expect: 2 + printf("%d\n", minimumDeletions(s2)); // expect: 2 +} diff --git a/min_deletions_balance_str.py b/min_deletions_balance_str.py new file mode 100644 index 0000000..674b1aa --- /dev/null +++ b/min_deletions_balance_str.py @@ -0,0 +1,31 @@ +# 1653. Minimum Deletions to Make String Balanced + +""" +you are given a string 's' consisting of only characters 'a' and 'b'. you can +delete any number of characters in 's' to make 's' balanced. 's' is balanced +if there is no pair of indices '(i, j)' such that 'i < j' and 's[i] = b' and +'s[j] = a'. return the minimum number of deletions needed to make 's' +balanced. +""" + + +class Solution(object): + def minimumDeletions(self, s): + """ + :type s: str + :rtype: int + """ + a, b, cnt = s.count("a"), 0, len(s) + for c in s: + if c == "b": + cnt = min(cnt, a + b) + b += 1 + else: + a -= 1 + return min(cnt, b) + + +if __name__ == "__main__": + obj = Solution() + print(obj.minimumDeletions("aababbab")) + print(obj.minimumDeletions("bbaaaaabb")) |