aboutsummaryrefslogtreecommitdiff
path: root/largest_3_digit_string.c
diff options
context:
space:
mode:
Diffstat (limited to 'largest_3_digit_string.c')
-rw-r--r--largest_3_digit_string.c45
1 files changed, 15 insertions, 30 deletions
diff --git a/largest_3_digit_string.c b/largest_3_digit_string.c
index 9c9ed41..baba195 100644
--- a/largest_3_digit_string.c
+++ b/largest_3_digit_string.c
@@ -1,5 +1,7 @@
// 2264. Largest 3-Same-Digit Number in String
#include "leetcode.h"
+#include <stdlib.h>
+#include <string.h>
/*
* given a string 'num' representing a large integer, an integer is good if it
@@ -8,37 +10,20 @@
* 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;
- }
+char *largestGoodInteger(char *num) {
+ static char *patterns[] = {"999", "888", "777", "666", "555",
+ "444", "333", "222", "111", "000"};
+ for (int i = 0; i < 10; i++)
+ if (strstr(num, patterns[i]))
+ return patterns[i];
+ return "";
}
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
+ char *n1 = "6777133339", *lgi1 = largestGoodInteger(n1);
+ char *n2 = "2300019", *lgi2 = largestGoodInteger(n2);
+ char *n3 = "42352338", *lgi3 = largestGoodInteger(n3);
+ printf("%s\n", lgi1); // expect: 777
+ printf("%s\n", lgi2); // expect: 000
+ printf("%s\n", lgi3); // expect: NULL
}