Add References to git

info/Minesweeper2/MinesweeperSolver/Combination.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Numerics;
+
+namespace MinesweeperSolver {
+    public class Combination {
+
+        public static BigInteger Calculate(int mines, int squares) {
+
+            long start = DateTime.Now.Ticks;
+
+            BigInteger top = 1;
+            BigInteger bot = 1;
+
+            var range = Math.Min(mines, squares - mines);
+
+            // calculate the combination. 
+            for (int i = 0; i < range; i++) {
+                top = top * (squares - i);
+                bot = bot * (i + 1);
+            }
+
+            BigInteger result = top / bot;
+
+            //SolverMain.Write(squares + " pick " + mines + " in " + result + " ways");
+            //SolverMain.Write("Combination duration " + (DateTime.Now.Ticks - start) + " ticks");
+
+            return result;
+
+        }
+ 
+        private static readonly BigInteger[] power10n = { BigInteger.One, new BigInteger(10), new BigInteger(100), new BigInteger(1000), new BigInteger(10000), new BigInteger(100000), new BigInteger(1000000) };
+        private static readonly int[] power10 = { 1, 10, 100, 1000, 10000, 100000, 1000000 };
+
+        public static double DivideBigIntegerToDouble(BigInteger numerator, BigInteger denominator, int dp) {
+
+            var work = numerator * power10n[dp] / denominator;
+
+            var result = (double) work / power10[dp];
+
+            return result;
+        }
+
+
+    }
+}