49 lines
1.4 KiB
C#
49 lines
1.4 KiB
C#
using System;
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using System.Collections.Generic;
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namespace CUSIP {
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class Program {
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static bool IsCusip(string s) {
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if (s.Length != 9) return false;
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int sum = 0;
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for (int i = 0; i <= 7; i++) {
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char c = s[i];
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int v;
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if (c >= '0' && c <= '9') {
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v = c - 48;
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}
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else if (c >= 'A' && c <= 'Z') {
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v = c - 55; // lower case letters apparently invalid
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}
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else if (c == '*') {
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v = 36;
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}
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else if (c == '#') {
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v = 38;
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}
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else {
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return false;
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}
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if (i % 2 == 1) v *= 2; // check if odd as using 0-based indexing
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sum += v / 10 + v % 10;
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}
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return s[8] - 48 == (10 - (sum % 10)) % 10;
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}
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static void Main(string[] args) {
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List<string> candidates = new List<string>() {
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"037833100",
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"17275R102",
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"38259P508",
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"594918104",
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"68389X106",
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"68389X105"
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};
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foreach (var candidate in candidates) {
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Console.WriteLine("{0} -> {1}", candidate, IsCusip(candidate) ? "correct" : "incorrect");
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}
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}
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}
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}
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