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// 2024. Maximize the Confusion of an Exam
#include <math.h>
#include <stdio.h>
#include <string.h>
/*
* a teacher is writing a test with 'n' true/false questions. with 'T' denoting
* true, and 'F' denoting false. he wants to confuse the students by maximising
* the number of consecutive questions with the same answer (multiple trues or
* multiple falses in a row) you are given a string 'answer_key', where
* 'answer_key[i]' is the original answer to the i'th question. in addition, you
* are given an integer 'k', the following operation:
* - change the answer key for any question to 'T' or 'F'
* return the maximum number of consecutive 'T's or 'F's in the answer key after
* performing the operation at most 'k' times
*/
int maxConsecutiveAnswers(char *answer_key, int k) {
int n = strlen(answer_key), left = 0, right = 0, t = 0, f = 0, ans = 0;
while (right < n) {
if (answer_key[right] == 'T') {
t++;
ans = fmax(ans, t);
} else {
f++;
ans = fmax(ans, f);
}
right++;
if ((right - left) > ans + k) {
if (answer_key[left] == 'T')
t--;
else
f--;
left++;
}
}
return right - left;
}
int main() {
char ak1[] = {"TTFF"}, ak2[] = {"TFFT"}, ak3[] = {"TTFTTFTT"};
printf("%d\n", maxConsecutiveAnswers(ak1, 2)); // expect: 4
printf("%d\n", maxConsecutiveAnswers(ak2, 1)); // expect: 3
printf("%d\n", maxConsecutiveAnswers(ak3, 1)); // expect: 5
}
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