Create maximum-good-people-based-on-statements.cpp

Author: kamyu104

C++/maximum-good-people-based-on-statements.cpp

@@ -0,0 +1,31 @@
+// Time:  O(n^2 * 2^n)
+// Space: O(1)
+
+// brute force, bitmask
+class Solution {
+public:
+    int maximumGood(vector<vector<int>>& statements) {
+        auto check = [&statements](int mask) {
+            for (int i = 0; i < size(statements); ++i) {
+                if (((mask >> i) & 1) == 0) {
+                    continue;
+                } 
+                for (int j = 0; j < size(statements[i]); ++j) {
+                    if (statements[i][j] != 2 && ((mask >> j) & 1) != statements[i][j]) {
+                        return false;
+                    }
+                }
+            }
+            return true;
+        };
+
+        const int total = 1 << size(statements);
+        int result = 0;
+        for (int mask = 0; mask < total; ++mask) {
+            if (check(mask)) {
+                result = max(result, __builtin_popcount(mask));
+            }
+        }
+        return result;
+    }
+};