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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
}
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