Data commit

Task/Display-a-linear-combination/C-sharp/display-a-linear-combination.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DisplayLinearCombination {
+    class Program {
+        static string LinearCombo(List<int> c) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < c.Count; i++) {
+                int n = c[i];
+                if (n < 0) {
+                    if (sb.Length == 0) {
+                        sb.Append('-');
+                    } else {
+                        sb.Append(" - ");
+                    }
+                } else if (n > 0) {
+                    if (sb.Length != 0) {
+                        sb.Append(" + ");
+                    }
+                } else {
+                    continue;
+                }
+
+                int av = Math.Abs(n);
+                if (av != 1) {
+                    sb.AppendFormat("{0}*", av);
+                }
+                sb.AppendFormat("e({0})", i + 1);
+            }
+            if (sb.Length == 0) {
+                sb.Append('0');
+            }
+            return sb.ToString();
+        }
+
+        static void Main(string[] args) {
+            List<List<int>> combos = new List<List<int>>{
+                new List<int> { 1, 2, 3},
+                new List<int> { 0, 1, 2, 3},
+                new List<int> { 1, 0, 3, 4},
+                new List<int> { 1, 2, 0},
+                new List<int> { 0, 0, 0},
+                new List<int> { 0},
+                new List<int> { 1, 1, 1},
+                new List<int> { -1, -1, -1},
+                new List<int> { -1, -2, 0, -3},
+                new List<int> { -1},
+            };
+
+            foreach (List<int> c in combos) {
+                var arr = "[" + string.Join(", ", c) + "]";
+                Console.WriteLine("{0,15} -> {1}", arr, LinearCombo(c));
+            }
+        }
+    }
+}