Create image-overlap.cpp

Author: kamyu104

C++/image-overlap.cpp

@@ -0,0 +1,26 @@
+// Time:  O(n^4)
+// Space: O(n^2)
+
+class Solution {
+public:
+    int largestOverlap(vector<vector<int>>& A, vector<vector<int>>& B) {
+        vector<int> count(pow(2 * A.size() - 1, 2));
+        for (int i = 0; i < A.size(); ++i) {
+            for (int j = 0; j < A[i].size(); ++j) {
+                if  (!A[i][j]) {
+                    continue;
+                }
+                for (int m = 0; m < B.size(); ++m) {
+                   for (int n = 0; n < B[m].size(); ++n) {
+                        if (!B[m][n]) {
+                            continue;
+                        }
+                        ++count[(A.size() - 1 + i - m) * (2 * A.size() - 1) +
+                                 A.size() - 1 + j - n];
+                   }
+                }
+            }
+        }
+        return *max_element(count.cbegin(), count.cend());
+    }
+};