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Coin2.java
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Coin2.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Coin2 {
public static long[] resultArr;
public static int[] coinArr;
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String[] infoArr = br.readLine().split(" ");
int coins = Integer.parseInt(infoArr[0]);
int total = Integer.parseInt(infoArr[1]);
initCoinArr(coins);
initResultArr(total);
for(int i = 0; i < coins; i++) {
coinArr[i] = Integer.parseInt(br.readLine());
}
mkResultArr();
System.out.println(resultArr[total]);
}
public static void mkResultArr() {
for(int i = 0; i < coinArr.length; i++) {
int coin = coinArr[i];
for(int j = coin; j < resultArr.length; j++) {
resultArr[j] += resultArr[j-coin];
}
}
}
public static void initResultArr(int length) {
resultArr = new long[length + 1];
resultArr[0] = 1;
}
public static void initCoinArr(int coin) {
coinArr = new int[coin];
}
}