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+// 3442. Maximum Difference Between Even and Odd Frequency I
+#include "leetcode.h"
+
+/*
+ * you are given a string 's' consisting of lowercase english letters. your task
+ * is to find the minimum difference 'diff = a1 - a2' between the frequency of
+ * characters 'a1' and 'a2' in the string such that 'a1' has an odd frequency in
+ * the string, and 'a2' has an even frequency in the string. return this maximum
+ * difference.
+ */
+
+int maxDifference(char *s) {
+ int *freq = (int *)calloc(26, sizeof(int)), n = strlen(s);
+ for (int i = 0; i < n; i++)
+ freq[s[i] - 'a']++;
+ int max = INT_MIN, min = INT_MAX;
+ for (int i = 0; i < 26; i++) {
+ if (max < freq[i] && freq[i] % 2)
+ max = freq[i];
+ if (min > freq[i] && !(freq[i] % 2) && freq[i])
+ min = freq[i];
+ }
+ free(freq);
+ return max - min;
+}
+
+int main() {
+ char *s1 = "aaaaabbc", *s2 = "abcabcab";
+ printf("%d\n", maxDifference(s1)); // expect: 3
+ printf("%d\n", maxDifference(s2)); // expect: 1
+}