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// 2311. Longest Binary Subsequence Less Than or Equal to K
#include "leetcode.h"
/*
* you are given a binary string 's' and a positive integer 'k'. return the
* length of the longest subsequence of 's' that makes up a binary number less
* than or equal to 'k'. note the subsequence can contain leading zeros, the
* empty string is considered to be equal to 0, and a subsequence is a string
* that can be derived from another string by deleting some or no characters
* without changing the order of the remaining characters.
*/
int longestSubsequence(char *s, int k) {
int ans = 0, cost = 1, n = strlen(s);
for (int i = n - 1; i >= 0; --i) {
if (s[i] == '0' || cost <= k) {
k -= cost * (s[i] - '0');
ans++;
}
if (cost <= k)
cost *= 2;
}
return ans;
}
int main() {
char *s1 = "1001010", *s2 = "00101001";
printf("%d\n", longestSubsequence(s1, 5)); // expect: 5
printf("%d\n", longestSubsequence(s2, 1)); // expect: 6
}
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