2541. Minimum Operations to Make Array Equal II

Given two integer arrays nums1 and nums2, sorted in non-decreasing order, return the minimum integer common to both arrays. If there is no common integer amongst nums1 and nums2, return -1.

Note that an integer is said to be common to nums1 and nums2 if both arrays have at least one occurrence of that integer.

class Solution {
public:
    int getCommon(vector<int>& nums1, vector<int>& nums2) {
        int i = 0, j = 0;
        while(i < nums1.size() and j < nums2.size()) {
            if(nums1[i] == nums2[j]) return nums1[i];
            else if(nums1[i] < nums2[j]) i++;
            else j++;
        }
        return -1;
    }
};