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DanceGame.java
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DanceGame.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
public class DanceGame {
private static int[] valueArr;
private static int[][][] resultArr;
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine(), " ");
initValueArr(st.countTokens() - 1);
initResultArr();
mkValueArr(st);
System.out.println(getResult(0, 0, 0));
}
private static void initValueArr(int length) {
valueArr = new int[length];
}
private static void mkValueArr(StringTokenizer st) {
for(int i = 0; i < valueArr.length; i++) {
valueArr[i] = Integer.parseInt(st.nextToken());
}
}
private static void initResultArr() {
resultArr = new int[5][5][valueArr.length];
for(int i = 0; i < 5; i++) {
for(int j = 0; j < 5; j++) {
Arrays.fill(resultArr[i][j], -1);
}
}
}
private static int getResult(int right, int left, int count) {
if(count == valueArr.length) return 0;
if(resultArr[right][left][count] != -1) return resultArr[right][left][count];
int to = valueArr[count];
resultArr[right][left][count] = Math.min(
getResult(to, left, count + 1) + getWeight(right, to),
getResult(right, to, count + 1) + getWeight(left, to)
);
return resultArr[right][left][count];
}
private static int getWeight(int from, int to) {
if(from == to) return 1;
if(from == 0) return 2;
if(Math.abs(from - to) == 2) return 4;
return 3;
}
}