結果

問題 No.269 見栄っ張りの募金活動
ユーザー uwiuwi
提出日時 2015-08-22 02:21:27
言語 Java21
(openjdk 21)
結果
AC  
実行時間 97 ms / 5,000 ms
コード長 3,117 bytes
コンパイル時間 4,556 ms
コンパイル使用メモリ 80,720 KB
実行使用メモリ 50,900 KB
最終ジャッジ日時 2024-07-16 01:32:13
合計ジャッジ時間 7,595 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 69 ms
49,892 KB
testcase_01 AC 67 ms
50,060 KB
testcase_02 AC 66 ms
50,032 KB
testcase_03 AC 72 ms
50,036 KB
testcase_04 AC 86 ms
50,860 KB
testcase_05 AC 69 ms
49,992 KB
testcase_06 AC 69 ms
50,088 KB
testcase_07 AC 97 ms
50,900 KB
testcase_08 AC 68 ms
49,848 KB
testcase_09 AC 67 ms
50,116 KB
testcase_10 AC 70 ms
49,892 KB
testcase_11 AC 76 ms
50,092 KB
testcase_12 AC 69 ms
50,124 KB
testcase_13 AC 78 ms
50,340 KB
testcase_14 AC 70 ms
49,940 KB
testcase_15 AC 77 ms
50,104 KB
testcase_16 AC 70 ms
50,264 KB
testcase_17 AC 70 ms
49,560 KB
testcase_18 AC 85 ms
50,600 KB
testcase_19 AC 78 ms
49,948 KB
testcase_20 AC 73 ms
49,580 KB
testcase_21 AC 72 ms
49,760 KB
testcase_22 AC 76 ms
50,244 KB
testcase_23 AC 68 ms
49,900 KB
testcase_24 AC 70 ms
49,680 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

package contest;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Q473 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni(), s = ni(), K = ni();
		int mod = 1000000007;
		s -= K*n*(n-1)/2;
		if(s < 0){
			out.println(0);
		}else{
			int[] dp = new int[s+1];
			dp[s] = 1;
			for(int i = 0;i < n;i++){
				for(int j = s;j >= n-i;j--){
					dp[j-(n-i)] += dp[j];
					if(dp[j-(n-i)] >= mod)dp[j-(n-i)] -= mod;
				}
			}
			out.println(dp[0]);
		}
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
	}
	
	public static void main(String[] args) throws Exception { new Q473().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
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