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-rw-r--r--largest_3_digit_string.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/largest_3_digit_string.c b/largest_3_digit_string.c
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+++ b/largest_3_digit_string.c
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+// 2264. Largest 3-Same-Digit Number in String
+#include "leetcode.h"
+
+/*
+ * given a string 'num' representing a large integer, an integer is good if it
+ * meets the following conditions: if it is a substring of 'num' with length
+ * '3', it consists of only one unique digit. return the maximum good integer as
+ * a string or an empty string "" if no such integer.
+ */
+
+char *largestGoodInterger(char *num) {
+ int n = strlen(num), chr = 'a', cnt = 1;
+ for (int i = 1; i < n; i++) {
+ if (num[i] == num[i - 1]) {
+ cnt++;
+ if (i < n - 1)
+ continue;
+ }
+ if (cnt >= 3) {
+ if (chr == 'a')
+ chr = num[i - 1];
+ else
+ chr = fmax(chr, num[i - 1]);
+ }
+ cnt = 1;
+ }
+ if (chr == 'a')
+ return "";
+ else {
+ char *ans = malloc(4);
+ ans[3] = '\0';
+ ans[0] = chr;
+ ans[1] = chr;
+ ans[2] = chr;
+ return ans;
+ }
+}
+
+int main() {
+ char *n1 = "6777133339", *n2 = "2300019", *n3 = "42352338";
+ printf("%s\n", largestGoodInterger(n1)); // expect: 777
+ printf("%s\n", largestGoodInterger(n2)); // expect: 000
+ printf("%s\n", largestGoodInterger(n3)); // expect: NULL
+}