Merge pull request #317 from verifiedHuman18/day3-q002

Added solution for Day3/q002

Author: zonedoutdg

Problems/Mathematics/Day-03/sol/Ayush_Saha/Solution2.class

@@ -0,0 +1,63 @@
+/* 
+FOREWORD:
+I took help from the internet in designing the recursive method `continuedFraction`. I hope that's ok.
+From this post in particular: https://stackoverflow.com/questions/48094595/convert-fraction-to-continued-fraction.
+That said, I am proud to say that I came up with the idea of continued fraction on my own.
+*/
+
+// Link to Submission: https://codeforces.com/contest/343/submission/355493183
+
+/*
+PROBLEM STATEMENT:
+You have unlimited unit resistors. You are given the Req.
+Find the minimum number of unit resistors you need to build a circuit using series and parallel configuration to achieve the Req.
+*/
+
+/*
+EXPLANATION:
+A fraction can either be proper or improper.
+For improper fractions we can convert it to mixed form i.e for a > b, we can write
+    a / b = k + (r / b), where r is a % b and k is floor(a / b).
+    r / b is a proper fraction so the next steps are same for both.
+Proper fractions mean the resistors are arranged in parallel.
+The simplest proper fraction to work with is of the type 1 / b, which means b resistors arranged in parallel.
+The first step of the converting a proper fraction to it's continued fraction form is to convert it into an improper fraction.
+So a / b becomes 1 / (b / a). Now we convert b / a to it's mixed form ki + (ri / ai). We keep doing this until we get r / ai, where r = 1.
+We keep tracking ki, because that gives us number of resistors arranged in series the final ai, gives the last few resistors
+    that are arranged in parallel.
+*/
+
+
+import java.util.*;
+
+public class Solution2 {
+    static long res = 0;
+    static void continuedFraction(long a, long b) {
+        if (b == 0) {
+            return;
+        }
+
+        long k = a / b;
+        long r = a % b;
+
+        res += k;
+
+        if (r != 0) {
+            continuedFraction(b, r);
+        }
+    }
+    public static void main(String[] args) {
+        Scanner sc = new Scanner (System.in);
+        long a = sc.nextLong();
+        long b = sc.nextLong();
+        
+        continuedFraction(a, b);
+
+        System.out.println(res);
+        sc.close();
+    }
+}
+
+// Time Complexity: O(log(min(a, b)))
+// Space Complexity: O(1) <- Not Sure
+