From 33a38e1938fb0238fd6bee03d7cdd540c60c0151 Mon Sep 17 00:00:00 2001
From: Afroz Chakure <aaaanchakure@gmail.com>
Date: Sun, 1 Oct 2023 13:54:50 +0530
Subject: [PATCH 1/4] add longest cycle In graph changes

---
 .../Algorithms/Hard/LongestCycleInAGraph.cpp  | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 LeetCode/Algorithms/Hard/LongestCycleInAGraph.cpp

diff --git a/LeetCode/Algorithms/Hard/LongestCycleInAGraph.cpp b/LeetCode/Algorithms/Hard/LongestCycleInAGraph.cpp
new file mode 100644
index 0000000..504a081
--- /dev/null
+++ b/LeetCode/Algorithms/Hard/LongestCycleInAGraph.cpp
@@ -0,0 +1,27 @@
+class Solution {
+public:
+    int longestCycle(vector<int>& edges) {
+        int ans = -1; 
+
+        vector<pair<int, int>> memo(edges.size(), {-1, -1}); 
+
+        // Distance, Cycle Identifier (Source Identifier) 
+        // cycleTracker.push_back(vector<int>{-1, -1}); 
+
+        for(int i=0; i<edges.size(); i++) {
+            
+            for(int j=i, dist=0; j != -1; j = e[j]) {
+                auto [dist_i, from_i] = memo[j]; 
+                if(dist_i == -1) {
+                    memo[j] = {dist++, i}; 
+                } else {
+                    if(from_i == i) {
+                        res = max(res, dist - dist_i); 
+                    }
+                    break; 
+                }
+            }
+        }    
+        return ans; 
+    }
+};
\ No newline at end of file

From f0b44615c2db4898ec0fba285ae185386cdc3926 Mon Sep 17 00:00:00 2001
From: Afroz Chakure <aaaanchakure@gmail.com>
Date: Sun, 1 Oct 2023 14:22:54 +0530
Subject: [PATCH 2/4] add changes

---
 LeetCode/Algorithms/.vscode/settings.json     |  4 +-
 .../Algorithms/Easy/.vscode/settings.json     |  5 +++
 LeetCode/Algorithms/Hard/RestoreTheArray.cpp  | 45 +++++++++++++++++++
 .../ShortestPathWithAlternatingColors.cpp     |  0
 4 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 LeetCode/Algorithms/Easy/.vscode/settings.json
 create mode 100644 LeetCode/Algorithms/Hard/RestoreTheArray.cpp
 create mode 100644 Leetcode/Algorithms/Medium/ShortestPathWithAlternatingColors.cpp

diff --git a/LeetCode/Algorithms/.vscode/settings.json b/LeetCode/Algorithms/.vscode/settings.json
index 48d27d6..5d99845 100644
--- a/LeetCode/Algorithms/.vscode/settings.json
+++ b/LeetCode/Algorithms/.vscode/settings.json
@@ -13,6 +13,8 @@
         "initializer_list": "cpp",
         "regex": "cpp",
         "valarray": "cpp",
-        "ostream": "cpp"
+        "ostream": "cpp",
+        "xstring": "cpp",
+        "xlocale": "cpp"
     }
 }
\ No newline at end of file
diff --git a/LeetCode/Algorithms/Easy/.vscode/settings.json b/LeetCode/Algorithms/Easy/.vscode/settings.json
new file mode 100644
index 0000000..fe0c1eb
--- /dev/null
+++ b/LeetCode/Algorithms/Easy/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "xlocale": "cpp"
+    }
+}
\ No newline at end of file
diff --git a/LeetCode/Algorithms/Hard/RestoreTheArray.cpp b/LeetCode/Algorithms/Hard/RestoreTheArray.cpp
new file mode 100644
index 0000000..112df13
--- /dev/null
+++ b/LeetCode/Algorithms/Hard/RestoreTheArray.cpp
@@ -0,0 +1,45 @@
+class Solution {
+public:
+    int numberOfArrays(string s, int k) {
+        vector<int> dp(s.size(), -1); 
+            
+    }
+};
+
+
+arr = [1,3,4,2], 
+
+mat = 
+      0 1 
+0   [[1,4],
+1    [2,3]]
+
+mpr
+
+1 0 
+4 0 
+2 1 
+3 1 
+
+mpc 
+1 0 
+4 1
+2 0 
+3 1
+
+mpr[1] = 0
+mprc[mpr[1]] = 1 
+mpcc[mpc[1]] = 1
+
+mpr[3] = 1
+mpc[3] = 1
+
+mprc[mpr[1]] = 2
+mpcc[mpc[1]] = 2 
+
+mpr[4] = 1 
+mpc[4] = 1
+
+mprc[mpr[1]] = 3 
+mpcc[mpc[1]] = 3; 
+ 
diff --git a/Leetcode/Algorithms/Medium/ShortestPathWithAlternatingColors.cpp b/Leetcode/Algorithms/Medium/ShortestPathWithAlternatingColors.cpp
new file mode 100644
index 0000000..e69de29

From 13e8269b2238dcd882a62f3787b0d1c70724dc80 Mon Sep 17 00:00:00 2001
From: Afroz Chakure <aaaanchakure@gmail.com>
Date: Sun, 1 Oct 2023 21:51:42 +0530
Subject: [PATCH 3/4] Create ReverseWordsInAString3.cpp

---
 .../Easy/ReverseWordsInAString3.cpp           | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 LeetCode/Algorithms/Easy/ReverseWordsInAString3.cpp

diff --git a/LeetCode/Algorithms/Easy/ReverseWordsInAString3.cpp b/LeetCode/Algorithms/Easy/ReverseWordsInAString3.cpp
new file mode 100644
index 0000000..a76f239
--- /dev/null
+++ b/LeetCode/Algorithms/Easy/ReverseWordsInAString3.cpp
@@ -0,0 +1,19 @@
+class Solution {
+public:
+    string reverseWords(string s) {
+        stringstream ss(s); 
+
+        string t; 
+        string result = ""; 
+
+        while(getline(ss, t, ' ')) {
+            reverse(t.begin(), t.end()); 
+            result += t + ' ';
+        }
+        return result.substr(0, result.size() - 1); 
+    }
+
+};
+
+// Time Complexity - O(N) 
+// Space Complexity - O(1)
\ No newline at end of file

From e2ab97444ac943b3a105d4b238dbac10ef7ed300 Mon Sep 17 00:00:00 2001
From: Afroz Chakure <aaaanchakure@gmail.com>
Date: Sun, 29 Oct 2023 23:55:22 +0530
Subject: [PATCH 4/4] add completed solutions

---
 LeetCode/Algorithms/Hard/PaintingTheWalls.cpp | 25 +++++++++++++++++++
 LeetCode/Algorithms/Hard/PoorPigs.cpp         | 25 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 LeetCode/Algorithms/Hard/PaintingTheWalls.cpp
 create mode 100644 LeetCode/Algorithms/Hard/PoorPigs.cpp

diff --git a/LeetCode/Algorithms/Hard/PaintingTheWalls.cpp b/LeetCode/Algorithms/Hard/PaintingTheWalls.cpp
new file mode 100644
index 0000000..5b24060
--- /dev/null
+++ b/LeetCode/Algorithms/Hard/PaintingTheWalls.cpp
@@ -0,0 +1,25 @@
+// Memoization 
+// Time Complexity - O(N^2)
+// Space Complexity - O(N^2)
+
+class Solution {
+public:
+    int paintWalls(vector<int>& cost, vector<int>& time) {
+        
+        return dfs(cost, time, cost.size(), 0); 
+    }
+
+    int dfs(vector<int> &cost, vector<int> &time, int remain, int i) {
+        if(remain <= 0) {
+            return 0; 
+        }
+
+        if(i == cost.size()) {
+            return INT_MAX;
+        }
+
+        int pain = dfs(cost, time, remain - 1 - time[i], i + 1); 
+        int skip = dfs(cost, time, remain, i+1); 
+        return min(pain, skip); 
+    }
+};
diff --git a/LeetCode/Algorithms/Hard/PoorPigs.cpp b/LeetCode/Algorithms/Hard/PoorPigs.cpp
new file mode 100644
index 0000000..23766bd
--- /dev/null
+++ b/LeetCode/Algorithms/Hard/PoorPigs.cpp
@@ -0,0 +1,25 @@
+class Solution {
+public:
+    int poorPigs(int buckets, int minutesToDie, int minutesToTest) {
+        if(buckets-- == 1) {
+            return 0; 
+        }
+
+        // 60 / 15 + 1 = 5 
+        int base = minutesToTest / minutesToDie + 1; 
+
+        // buckets = 5
+        // buckets = 25, take 5 
+        // buckets = buckets>25 and buckets < 125 
+        int res = 0; 
+        while(buckets > 0) {
+            buckets = buckets / base; 
+            res += 1; 
+        }
+        return res; 
+    }   
+};
+
+// Time Complexity - O(log(1000)) ~ O(1)
+// Space Complexity - O(1)
+// Refer to solution from Suchit Dedeja for it 
\ No newline at end of file