From 97be9743f1070583c94156a2d775353926c19ef4 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Mon, 1 Dec 2025 21:58:29 -0600
Subject: [PATCH 1/9] initial

---
 Problem1.java | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 Problem1.java

diff --git a/Problem1.java b/Problem1.java
new file mode 100644
index 0000000..59bb7a1
--- /dev/null
+++ b/Problem1.java
@@ -0,0 +1,5 @@
+public class Problem1 {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
\ No newline at end of file

From 39b97e1e672614981f03ce7072ee679cf6335e99 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Mon, 1 Dec 2025 22:16:06 -0600
Subject: [PATCH 2/9] solved 1

---
 Problem1.java            |   46 +-
 inputs/inputProblem1.txt | 4543 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 4588 insertions(+), 1 deletion(-)
 create mode 100644 inputs/inputProblem1.txt

diff --git a/Problem1.java b/Problem1.java
index 59bb7a1..efe6010 100644
--- a/Problem1.java
+++ b/Problem1.java
@@ -1,5 +1,49 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.util.ArrayList;
+
 public class Problem1 {
+
     public static void main(String[] args) {
-        System.out.println("Hello, World!");
+        ArrayList<String> allLines = new ArrayList<>();
+
+        try (BufferedReader reader = new BufferedReader(new FileReader("inputs/inputProblem1.txt"))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                allLines.add(line);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        // Call solve and print result
+        System.out.println(solve(allLines));
+    }
+
+    public static int solve(ArrayList<String> allLines) {
+        int dial = 50;
+
+        int total = 0;
+
+        for (String line : allLines) {
+            int value = Integer.parseInt(line.substring(1));
+            if (line.charAt(0)=='L'){
+                System.out.println("Turned Left: " + value);
+                dial -= value;
+            } else {
+                System.out.println("Turned Right: " + value);
+                dial += value;
+            }
+            
+            int num = (dial % 100 + 100) % 100; // Ensure num is between 0-99
+            System.out.println("Current Dial Position: " + num);
+
+            if (num == 0) {
+                total++;
+            }
+
+        }
+
+        return total;
     }
 }
\ No newline at end of file
diff --git a/inputs/inputProblem1.txt b/inputs/inputProblem1.txt
new file mode 100644
index 0000000..2de2b86
--- /dev/null
+++ b/inputs/inputProblem1.txt
@@ -0,0 +1,4543 @@
+R20
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+L11
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From d5d903aa1055681c0f4b114b04075d21ab0b78c0 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Tue, 2 Dec 2025 22:21:30 -0600
Subject: [PATCH 3/9] Fixed

---
 Problem1b.java | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Problem1b.java

diff --git a/Problem1b.java b/Problem1b.java
new file mode 100644
index 0000000..57f2943
--- /dev/null
+++ b/Problem1b.java
@@ -0,0 +1,44 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.util.ArrayList;
+
+public class Problem1b {
+
+    public static void main(String[] args) {
+        ArrayList<String> allLines = new ArrayList<>();
+
+        try (BufferedReader reader = new BufferedReader(new FileReader("inputs/inputProblem1.txt"))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                allLines.add(line);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        // Call solve and print result
+        System.out.println(solve(allLines));
+    }
+
+    public static int solve(ArrayList<String> allLines) {
+        int dial = 50;  // starting position
+        int total = 0;
+
+        for (String line : allLines) {
+            int value = Integer.parseInt(line.substring(1));
+            int direction = (line.charAt(0) == 'L') ? -1 : 1;
+
+            // Step through each click to count zeros correctly
+            for (int step = 0; step < value; step++) {
+                dial = (dial + direction + 100) % 100; // wrap around 0-99
+                if (dial == 0) {
+                    total++;
+                }
+            }
+
+            System.out.println("Current Dial Position: " + dial + " || Total: " + total);
+        }
+
+        return total;
+    }
+}
\ No newline at end of file

From c4b24c9d313d68bf4b97d10426c5a08dd8555978 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Tue, 2 Dec 2025 22:26:38 -0600
Subject: [PATCH 4/9] restructured + input for 2

---
 inputs/inputProblem2.txt             |  1 +
 Problem1.java => src/Problem1.java   |  2 +
 Problem1b.java => src/Problem1b.java |  2 +
 src/Problem2.java                    | 56 ++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 inputs/inputProblem2.txt
 rename Problem1.java => src/Problem1.java (98%)
 rename Problem1b.java => src/Problem1b.java (98%)
 create mode 100644 src/Problem2.java

diff --git a/inputs/inputProblem2.txt b/inputs/inputProblem2.txt
new file mode 100644
index 0000000..69b5adc
--- /dev/null
+++ b/inputs/inputProblem2.txt
@@ -0,0 +1 @@
+9191906840-9191941337,7671-13230,2669677096-2669816099,2-12,229599-392092,48403409-48523311,96763-229430,1919163519-1919240770,74928-96389,638049-668065,34781-73835,736781-819688,831765539-831907263,5615884-5749554,14101091-14196519,7134383-7169141,413340-625418,849755289-849920418,7745350-7815119,16717-26267,4396832-4549887,87161544-87241541,4747436629-4747494891,335-549,867623-929630,53-77,1414-3089,940604-1043283,3444659-3500714,3629-7368,79-129,5488908-5597446,97922755-98097602,182-281,8336644992-8336729448,24-47,613-1077
diff --git a/Problem1.java b/src/Problem1.java
similarity index 98%
rename from Problem1.java
rename to src/Problem1.java
index efe6010..4f0b0ad 100644
--- a/Problem1.java
+++ b/src/Problem1.java
@@ -1,3 +1,5 @@
+package src;
+
 import java.io.BufferedReader;
 import java.io.FileReader;
 import java.util.ArrayList;
diff --git a/Problem1b.java b/src/Problem1b.java
similarity index 98%
rename from Problem1b.java
rename to src/Problem1b.java
index 57f2943..92dddc2 100644
--- a/Problem1b.java
+++ b/src/Problem1b.java
@@ -1,3 +1,5 @@
+package src;
+
 import java.io.BufferedReader;
 import java.io.FileReader;
 import java.util.ArrayList;
diff --git a/src/Problem2.java b/src/Problem2.java
new file mode 100644
index 0000000..e493346
--- /dev/null
+++ b/src/Problem2.java
@@ -0,0 +1,56 @@
+package src;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Problem2 {
+
+    public static void main(String[] args) {
+        String filePath = "inputs/inputProblem2.txt";
+
+        try {
+            String input = readFileAsString(filePath);
+            List<Long> numbers = parseRanges(input);
+
+            for (Long num : numbers) {
+                System.out.println(num);
+            }
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static String readFileAsString(String filePath) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                sb.append(line.trim()); // remove extra spaces/newlines
+            }
+        }
+        return sb.toString();
+    }
+
+    public static List<Long> parseRanges(String input) {
+        List<Long> result = new ArrayList<>();
+        String[] ranges = input.split(",");
+
+        for (String range : ranges) {
+            String[] parts = range.split("-");
+            if (parts.length != 2) {
+                throw new IllegalArgumentException("Invalid range: " + range);
+            }
+            long start = Long.parseLong(parts[0]);
+            long end = Long.parseLong(parts[1]);
+            result.add(start);
+            result.add(end);
+        }
+
+        return result;
+    }
+    
+}
\ No newline at end of file

From 33da6eb1b0ea6643c1770f42d1b719ebecf57c8d Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Tue, 2 Dec 2025 22:50:02 -0600
Subject: [PATCH 5/9] solved 2

---
 src/Problem2.java | 53 ++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 41 insertions(+), 12 deletions(-)

diff --git a/src/Problem2.java b/src/Problem2.java
index e493346..7141fb5 100644
--- a/src/Problem2.java
+++ b/src/Problem2.java
@@ -13,44 +13,73 @@ public class Problem2 {
 
         try {
             String input = readFileAsString(filePath);
-            List<Long> numbers = parseRanges(input);
-
-            for (Long num : numbers) {
-                System.out.println(num);
-            }
+            List<long[]> ranges = parseRanges(input);
+            long tally = solve(ranges);
+            System.out.println("Sum of invalid IDs: " + tally);
 
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 
+    // Solve by generating only repeated IDs
+    public static long solve(List<long[]> ranges) {
+        long sum = 0;
+
+        for (long[] range : ranges) {
+            long start = range[0];
+            long end = range[1];
+
+            for (long num = start; num <= end; num++) {
+                String numStr = String.valueOf(num);
+                int len = numStr.length();
+
+                if (len % 2 != 0) continue;
+
+                boolean repeated = false;
+                for (int prefixLen = 1; prefixLen <= len / 2; prefixLen++) {
+                    if (len % prefixLen != 0) continue; // must divide evenly
+
+                    String prefix = numStr.substring(0, prefixLen);
+                    String repeatedNum = prefix + prefix;
+                    if (repeatedNum.equals(numStr)) {
+                        repeated = true;
+                        break;
+                    }
+                }
+
+                if (repeated) sum += num;
+            }
+        }
+
+        return sum;
+    }
+
     public static String readFileAsString(String filePath) throws IOException {
         StringBuilder sb = new StringBuilder();
         try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
             String line;
             while ((line = reader.readLine()) != null) {
-                sb.append(line.trim()); // remove extra spaces/newlines
+                sb.append(line.trim());
             }
         }
         return sb.toString();
     }
 
-    public static List<Long> parseRanges(String input) {
-        List<Long> result = new ArrayList<>();
+    public static List<long[]> parseRanges(String input) {
+        List<long[]> result = new ArrayList<>();
         String[] ranges = input.split(",");
 
         for (String range : ranges) {
-            String[] parts = range.split("-");
+            String[] parts = range.trim().split("-");
             if (parts.length != 2) {
                 throw new IllegalArgumentException("Invalid range: " + range);
             }
             long start = Long.parseLong(parts[0]);
             long end = Long.parseLong(parts[1]);
-            result.add(start);
-            result.add(end);
+            result.add(new long[]{start, end});
         }
 
         return result;
     }
-    
 }
\ No newline at end of file

From c87b3ce3673ab083bb3cd6583d510345b22ffc87 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Tue, 2 Dec 2025 22:51:47 -0600
Subject: [PATCH 6/9] solved 2b

---
 src/Problem2b.java | 87 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 src/Problem2b.java

diff --git a/src/Problem2b.java b/src/Problem2b.java
new file mode 100644
index 0000000..52e9268
--- /dev/null
+++ b/src/Problem2b.java
@@ -0,0 +1,87 @@
+package src;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Problem2b {
+
+    public static void main(String[] args) {
+        String filePath = "inputs/inputProblem2.txt";
+
+        try {
+            String input = readFileAsString(filePath);
+            List<long[]> ranges = parseRanges(input);
+            long tally = solve(ranges);
+            System.out.println("Sum of invalid IDs: " + tally);
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+    public static long solve(List<long[]> ranges) {
+        long sum = 0;
+
+        for (long[] range : ranges) {
+            long start = range[0];
+            long end = range[1];
+
+            for (long num = start; num <= end; num++) {
+                String numStr = String.valueOf(num);
+                int len = numStr.length();
+
+                boolean repeated = false;
+
+                for (int prefixLen = 1; prefixLen <= len / 2; prefixLen++) {
+                    if (len % prefixLen != 0) continue;
+
+                    String prefix = numStr.substring(0, prefixLen);
+                    int times = len / prefixLen;
+                    StringBuilder sb = new StringBuilder();
+                    for (int t = 0; t < times; t++) {
+                        sb.append(prefix);
+                    }
+
+                    if (sb.toString().equals(numStr)) {
+                        repeated = true;
+                        break;
+                    }
+                }
+
+                if (repeated) sum += num;
+            }
+        }
+
+        return sum;
+    }
+
+    public static String readFileAsString(String filePath) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                sb.append(line.trim());
+            }
+        }
+        return sb.toString();
+    }
+
+    public static List<long[]> parseRanges(String input) {
+        List<long[]> result = new ArrayList<>();
+        String[] ranges = input.split(",");
+
+        for (String range : ranges) {
+            String[] parts = range.trim().split("-");
+            if (parts.length != 2) {
+                throw new IllegalArgumentException("Invalid range: " + range);
+            }
+            long start = Long.parseLong(parts[0]);
+            long end = Long.parseLong(parts[1]);
+            result.add(new long[]{start, end});
+        }
+
+        return result;
+    }
+}
\ No newline at end of file

From 9fd5c2b616b0c115ee1db96b082ca6c9558682f1 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Wed, 3 Dec 2025 22:21:01 -0600
Subject: [PATCH 7/9] solved 3a

---
 inputs/inputProblem3.txt | 200 +++++++++++++++++++++++++++++++++++++++
 src/Problem3.java        |  41 ++++++++
 2 files changed, 241 insertions(+)
 create mode 100644 inputs/inputProblem3.txt
 create mode 100644 src/Problem3.java

diff --git a/inputs/inputProblem3.txt b/inputs/inputProblem3.txt
new file mode 100644
index 0000000..c9d8612
--- /dev/null
+++ b/inputs/inputProblem3.txt
@@ -0,0 +1,200 @@
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diff --git a/src/Problem3.java b/src/Problem3.java
new file mode 100644
index 0000000..f53ad48
--- /dev/null
+++ b/src/Problem3.java
@@ -0,0 +1,41 @@
+package src;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class Problem3 {
+
+    public static void main(String[] args) {
+        String filePath = "inputs/inputProblem3.txt";
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            long total = 0;
+            while ((line = reader.readLine()) != null) {
+                total += maxTwoDigit(line);
+            }
+            System.out.println(total);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static int maxTwoDigit(String digits) {
+        int maxDigit = -1;
+        int maxValue = 0;
+        for (char c : digits.toCharArray()) {
+            int digit = c - '0';
+            if (maxDigit >= 0) {
+                int value = maxDigit * 10 + digit;
+                if (value > maxValue) {
+                    maxValue = value;
+                }
+            }
+            if (digit > maxDigit) {
+                maxDigit = digit;
+            }
+        }
+
+        return maxValue;
+    }
+}
\ No newline at end of file

From 318edb6310f86f571b2e5703f47430bfbdd92460 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Wed, 3 Dec 2025 22:23:56 -0600
Subject: [PATCH 8/9] solved 3b

---
 src/Problem3b.java | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/Problem3b.java

diff --git a/src/Problem3b.java b/src/Problem3b.java
new file mode 100644
index 0000000..d17bccd
--- /dev/null
+++ b/src/Problem3b.java
@@ -0,0 +1,39 @@
+package src;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class Problem3b {
+
+    public static void main(String[] args) {
+        String filePath = "inputs/inputProblem3.txt";
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            long total = 0;
+            while ((line = reader.readLine()) != null) {
+                String maxDigits = maxKDigitsString(line, 12);
+                total += Long.parseLong(maxDigits);
+            }
+            System.out.println("Total maximum joltage: " + total);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static String maxKDigitsString(String digits, int k) {
+        int n = digits.length();
+        char[] stack = new char[k];
+        int top = 0;
+        for (int i = 0; i < n; i++) {
+            char c = digits.charAt(i);
+            while (top > 0 && stack[top - 1] < c && (top - 1 + (n - i)) >= k) {
+                top--;
+            }
+            if (top < k) {
+                stack[top++] = c;
+            }
+        }
+        return new String(stack, 0, k);
+    }
+}
\ No newline at end of file

From bcf108f604bab02e9ac57de83abf4d7b2661f7f8 Mon Sep 17 00:00:00 2001
From: KeshavAnandCode <keshavanandofficial@gmail.com>
Date: Wed, 3 Dec 2025 22:24:44 -0600
Subject: [PATCH 9/9] fixed 3b solution

---
 src/Problem3b.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Problem3b.java b/src/Problem3b.java
index d17bccd..67563b4 100644
--- a/src/Problem3b.java
+++ b/src/Problem3b.java
@@ -15,7 +15,7 @@ public class Problem3b {
                 String maxDigits = maxKDigitsString(line, 12);
                 total += Long.parseLong(maxDigits);
             }
-            System.out.println("Total maximum joltage: " + total);
+            System.out.println(total);
         } catch (IOException e) {
             e.printStackTrace();
         }