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// 2616. Minimize the Maximum Difference of Pairs
#include <stdio.h>
#include <stdlib.h>
/*
* given a 0-indexed integer array 'nums' and an integer 'p'. find 'p' pairs of
* indices of 'nums' such that the maximum difference amongst all the pairs is
* minimised. also, ensure no index appears more than once amongst that 'p'
* pairs. note that for a pair of elements at the index 'i' and 'j'. the
* difference of this pair is '|nums[i] - nums[j]|', where '|x|' represents the
* absolute value of 'x'. return the minimum maximum difference among all 'p'
* pairs. we define the maximum of an empty set to be zero.
*/
int cmp(const void *a, const void *b) { return *(int *)a - *(int *)b; }
int minimizeMax(int *nums, int nums_size, int p) {
qsort(nums, nums_size, sizeof(int), cmp);
int i, j, left = 0, right = nums[nums_size - 1] - nums[0];
while (left < right) {
int mid = (left + right) / 2;
int cnt = 0;
for (int i = 0; i + 1 < nums_size; ++i)
if (mid >= nums[i + 1] - nums[i])
++cnt, ++i;
if (cnt >= p)
right = mid;
else
left = mid + 1;
}
return left;
}
int main() {
int n1[] = {10, 1, 2, 7, 1, 3}, n2[] = {4, 2, 1, 2};
printf("%d\n", minimizeMax(n1, 6, 2)); // expect: 1
printf("%d\n", minimizeMax(n2, 4, 1)); // expect: 0
}
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