42 lines
936 B
Java
42 lines
936 B
Java
public class RN {
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enum Numeral {
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I(1), IV(4), V(5), IX(9), X(10), XL(40), L(50), XC(90), C(100), CD(400), D(500), CM(900), M(1000);
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int weight;
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Numeral(int weight) {
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this.weight = weight;
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}
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};
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public static String roman(long n) {
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if( n <= 0) {
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throw new IllegalArgumentException();
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}
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StringBuilder buf = new StringBuilder();
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final Numeral[] values = Numeral.values();
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for (int i = values.length - 1; i >= 0; i--) {
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while (n >= values[i].weight) {
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buf.append(values[i]);
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n -= values[i].weight;
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}
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}
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return buf.toString();
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}
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public static void test(long n) {
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System.out.println(n + " = " + roman(n));
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}
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public static void main(String[] args) {
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test(1999);
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test(25);
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test(944);
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test(0);
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}
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}
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