Create minimum-absolute-sum-difference.cpp

Author: kamyu104

C++/minimum-absolute-sum-difference.cpp

@@ -0,0 +1,28 @@
+// Time:  O(nlogn)
+// Space: O(n)
+
+class Solution {
+public:
+    int minAbsoluteSumDiff(vector<int>& nums1, vector<int>& nums2) {
+        static const int MOD = 1e9 + 7;
+
+        vector<int> sorted_nums1(cbegin(nums1), cend(nums1));
+        sort(begin(sorted_nums1), end(sorted_nums1));
+        int result = 0, max_change = 0;
+        for (int i = 0; i < size(nums2); ++i) {
+            int diff = abs(nums1[i] - nums2[i]);
+            result = (result + diff) % MOD;
+            if (diff < max_change) {
+                continue;
+            }
+            const auto cit = lower_bound(cbegin(sorted_nums1), cend(sorted_nums1), nums2[i]);
+            if (cit != cend(sorted_nums1)) {
+                max_change = max(max_change, diff - abs(*cit - nums2[i]));
+            }
+            if (cit != cbegin(sorted_nums1)) {
+                max_change = max(max_change, diff - abs(*prev(cit) - nums2[i]));
+            }
+        }
+        return (result - max_change + MOD) % MOD;
+    }
+};