Python to c conversion. Pls do convert this code to c language

[trupvicky]

from collections import deque, Counter

class Solution:
    def smallestRange(self, nums: List[List[int]]) -> List[int]:

        new = []
        # merge each list and keep track of original list
        for i in range(len(nums)):
            for j in nums[i]:
                new.append((j, i))
        # sort so each sliding window represents a range
        new.sort()

        d = deque()
        c = Counter()

        res = [-float('inf'), float('inf')]
        # iterate over sliding windows that contain each list
        for i in new:
            d.append(i)
            c[i[1]] += 1
            while len(c) == len(nums):
                res = min(res, [d[0][0], d[-1][0]], key = lambda x: x[1] - x[0])
                a, b = d.popleft()
                c[b] -= 1
                if not c[b]: del c[b]
        return res

[dev7060]

Please do have a look on posting guidelines.