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// 1318. Minimum Flips to Make a OR b Equal to c
#include <stdio.h>
#include <stdlib.h>
/*
* given three positive numbers 'a, b, c'. return the minimum flips required in
* some bits of 'a | b == c'. flip operation consists of changing any single bit
* 1 to 0 or changing the bit 0 to 1 in their binary representation
*/
int minFlips(int a, int b, int c) {
int *digit = calloc(31, sizeof(int));
int idx = 0;
while (a) {
digit[idx] += (a & 1);
a >>= 1;
idx++;
}
idx = 0;
while (b) {
digit[idx] += (b & 1);
b >>= 1;
idx++;
}
int ans = 0;
for (int i = 0; i < 31; i++) {
if ((c >> i) & 1)
ans += (digit[i] == 0);
else
ans += digit[i];
}
return ans;
}
int main() {
printf("%d\n", minFlips(2, 6, 5)); // expect: 3
printf("%d\n", minFlips(4, 2, 7)); // expect: 1
printf("%d\n", minFlips(1, 2, 3)); // expect: 0
}
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