Write in a certain order by exhaustive method: ① Baili 7; 25 is in hundreds; In the hundreds, just write all the three digits that can be composed. When writing these three numbers, write them in a certain order, and don't omit or repeat them. At the same time, 375 has no maximum common factor and minimum common multiple. Because the greatest common divisor and the least common multiple are two different meanings.
Find the k pair with the smallest sum, and give two integer arrays nums 1 and nums2 in ascending order. One integer k defines a pair of values (u, v), in which the first element comes from nums 1 and the second element comes from nums2.