/C06041 - Xâu con lớn nhất
<Problem>
https://code.ptit.edu.vn/student/question/C06041#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
#include <ctype.h>
int main() {
char s[100001];
gets(s);
int len = strlen(s);
int p = 0;
while (p < len) {
char c = s[p];
for (int i = p; i < len; i++) {
if (c < s[i]) {
c = s[i];
}
}
for (int i = p; i < len; i++) {
if (c == s[i]) {
printf("%c", s[i]);
p = i + 1;
}
}
}
return 0;
}