結果
| 問題 |
No.118 門松列(2)
|
| ユーザー |
|
| 提出日時 | 2015-11-30 23:40:35 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 192 ms / 5,000 ms |
| コード長 | 2,232 bytes |
| コンパイル時間 | 3,645 ms |
| コンパイル使用メモリ | 78,844 KB |
| 実行使用メモリ | 50,096 KB |
| 最終ジャッジ日時 | 2024-10-09 07:11:55 |
| 合計ジャッジ時間 | 7,803 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 26 |
ソースコード
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Iterator;
public class Main_yukicoder118 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Printer pr = new Printer(System.out);
final long MOD = 1_000_000_007L;
int n = sc.nextInt();
int[] a = new int[100 + 1];
for (int i = 0; i < n; i++) {
a[sc.nextInt()]++;
}
int[] sum = new int[100 + 1];
for (int i = 1; i <= 100; i++) {
sum[i] = sum[i - 1] + a[i];
}
long ret = 0;
for (int i = 1; i <= 100; i++) {
if (a[i] == 0) {
continue;
}
int k = 1;
for (int j = i + 1; j <= 100; j++) {
if (a[j] == 0) {
continue;
}
if (k < 2) {
k++;
} else {
ret = ret + (long)a[i] * a[j] * (sum[j - 1] - sum[i]);
ret %= MOD;
}
}
}
pr.println(ret);
pr.close();
sc.close();
}
@SuppressWarnings("unused")
private static class Scanner {
BufferedReader br;
Iterator<String> it;
Scanner (InputStream in) {
br = new BufferedReader(new InputStreamReader(in));
}
String next() throws RuntimeException {
try {
if (it == null || !it.hasNext()) {
it = Arrays.asList(br.readLine().split(" ")).iterator();
}
return it.next();
} catch (IOException e) {
throw new IllegalStateException();
}
}
int nextInt() throws RuntimeException {
return Integer.parseInt(next());
}
long nextLong() throws RuntimeException {
return Long.parseLong(next());
}
float nextFloat() throws RuntimeException {
return Float.parseFloat(next());
}
double nextDouble() throws RuntimeException {
return Double.parseDouble(next());
}
void close() {
try {
br.close();
} catch (IOException e) {
// throw new IllegalStateException();
}
}
}
private static class Printer extends PrintWriter {
Printer(PrintStream out) {
super(out);
}
}
}