Create minimum-number-of-frogs-croaking.cpp

Author: kamyu104

C++/minimum-number-of-frogs-croaking.cpp

@@ -0,0 +1,23 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    int minNumberOfFrogs(string croakOfFrogs) {
+        static const string S = "croak";
+        vector<int> lookup(5);
+        int result = 0;
+        for (const auto& c : croakOfFrogs) {
+            int i = S.find(c);
+            ++lookup[i];
+            if (lookup[(i - 1 + lookup.size()) % lookup.size()]) {
+                --lookup[(i - 1 + lookup.size()) % lookup.size()];
+            } else if (i == 0) {
+                ++result;
+            } else {
+                return -1;
+            }
+        }
+        return result == lookup.back() ? result : -1;
+    }
+};