Submission #1101735
Source Code Expand
using System; using System.Linq; using System.Collections.Generic; using Debug = System.Diagnostics.Debug; using StringBuilder = System.Text.StringBuilder; using System.Numerics; using Point = System.Numerics.Complex; using Number = System.Int64; namespace Program { public class Solver { public void Solve() { var n = sc.Integer(); var a = sc.Integer(); var b = sc.Integer(); var c = sc.Integer(); if (b % 2 != 0) { IO.Printer.Out.WriteLine(0); return; } const long MOD = (long)1e9 + 7; var C = Enumerate(n + 50, x => new long[n + 50]); C[0][0] = 1; for (int i = 0; i <= n; i++) for (int j = 0; j <= n; j++) { C[i + 1][j] = (C[i + 1][j] + C[i][j]) % MOD; C[i + 1][j + 1] = (C[i + 1][j + 1] + C[i][j]) % MOD; } long ans = 0; for (int i = 0; i <= a; i++) for (int j = 0; 3 * j <= c; j++) { if (c - 3 * j < a - i) continue; var x = i; var y = j; var z = a - i; var rem = c - 3 * j - z; long p = C[x + y][x]; p = (p * C[x + y + z][z]) % MOD; if (rem > 0) { if (b > 0) p = (p * C[rem + b / 2 - 1][rem]) % MOD; else p = 0; } p = (p * C[x + y + z + b / 2][b / 2]) % MOD; ans = (ans + p) % MOD; } IO.Printer.Out.WriteLine(ans); } public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput()); static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; } static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; } } } #region main static class Ex { static public string AsString(this IEnumerable<char> ie) { return new string(System.Linq.Enumerable.ToArray(ie)); } static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") { return string.Join(st, ie); } static public void Main() { var solver = new Program.Solver(); solver.Solve(); Program.IO.Printer.Out.Flush(); } } #endregion #region Ex namespace Program.IO { using System.IO; using System.Text; using System.Globalization; public class Printer: StreamWriter { static Printer() { Out = new Printer(Console.OpenStandardOutput()) { AutoFlush = false }; } public static Printer Out { get; set; } public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } } public Printer(System.IO.Stream stream) : base(stream, new UTF8Encoding(false, true)) { } public Printer(System.IO.Stream stream, Encoding encoding) : base(stream, encoding) { } public void Write<T>(string format, T[] source) { base.Write(format, source.OfType<object>().ToArray()); } public void WriteLine<T>(string format, T[] source) { base.WriteLine(format, source.OfType<object>().ToArray()); } } public class StreamScanner { public StreamScanner(Stream stream) { str = stream; } public readonly Stream str; private readonly byte[] buf = new byte[1024]; private int len, ptr; public bool isEof = false; public bool IsEndOfStream { get { return isEof; } } private byte read() { if (isEof) return 0; if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } } return buf[ptr++]; } public char Char() { byte b = 0; do b = read(); while ((b < 33 || 126 < b) && !isEof); return (char)b; } public string Scan() { var sb = new StringBuilder(); for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b); return sb.ToString(); } public string ScanLine() { var sb = new StringBuilder(); for (var b = Char(); b != '\n'; b = (char)read()) if (b == 0) break; else if (b != '\r') sb.Append(b); return sb.ToString(); } public long Long() { if (isEof) return long.MinValue; long ret = 0; byte b = 0; var ng = false; do b = read(); while (b != 0 && b != '-' && (b < '0' || '9' < b)); if (b == 0) return long.MinValue; if (b == '-') { ng = true; b = read(); } for (; true; b = read()) { if (b < '0' || '9' < b) return ng ? -ret : ret; else ret = ret * 10 + b - '0'; } } public int Integer() { return (isEof) ? int.MinValue : (int)Long(); } public double Double() { var s = Scan(); return s != "" ? double.Parse(s, CultureInfo.InvariantCulture) : double.NaN; } private T[] enumerate<T>(int n, Func<T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(); return a; } public char[] Char(int n) { return enumerate(n, Char); } public string[] Scan(int n) { return enumerate(n, Scan); } public double[] Double(int n) { return enumerate(n, Double); } public int[] Integer(int n) { return enumerate(n, Integer); } public long[] Long(int n) { return enumerate(n, Long); } } } #endregion
Submission Info
Submission Time | |
---|---|
Task | J - 123 Pairs |
User | camypaper |
Language | C# (Mono 4.6.2.0) |
Score | 1500 |
Code Size | 5912 Byte |
Status | AC |
Exec Time | 1398 ms |
Memory | 206376 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | example0.txt, example1.txt |
All | 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, 044.txt, 045.txt, 046.txt, 047.txt, 048.txt, 049.txt, example0.txt, example1.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
000.txt | AC | 1317 ms | 206368 KB |
001.txt | AC | 1249 ms | 206376 KB |
002.txt | AC | 1249 ms | 206376 KB |
003.txt | AC | 1249 ms | 206376 KB |
004.txt | AC | 1252 ms | 206376 KB |
005.txt | AC | 1251 ms | 206376 KB |
006.txt | AC | 1250 ms | 206376 KB |
007.txt | AC | 1249 ms | 206376 KB |
008.txt | AC | 1252 ms | 206376 KB |
009.txt | AC | 1250 ms | 206376 KB |
010.txt | AC | 1238 ms | 205352 KB |
011.txt | AC | 1219 ms | 203304 KB |
012.txt | AC | 1235 ms | 204968 KB |
013.txt | AC | 46 ms | 12120 KB |
014.txt | AC | 47 ms | 11992 KB |
015.txt | AC | 1225 ms | 193448 KB |
016.txt | AC | 156 ms | 28888 KB |
017.txt | AC | 476 ms | 75072 KB |
018.txt | AC | 132 ms | 20824 KB |
019.txt | AC | 614 ms | 98872 KB |
020.txt | AC | 677 ms | 119864 KB |
021.txt | AC | 1322 ms | 203808 KB |
022.txt | AC | 969 ms | 162608 KB |
023.txt | AC | 1270 ms | 206376 KB |
024.txt | AC | 1356 ms | 206376 KB |
025.txt | AC | 1267 ms | 206376 KB |
026.txt | AC | 1306 ms | 206376 KB |
027.txt | AC | 1345 ms | 206376 KB |
028.txt | AC | 1282 ms | 206376 KB |
029.txt | AC | 1291 ms | 206376 KB |
030.txt | AC | 1337 ms | 206376 KB |
031.txt | AC | 1352 ms | 206376 KB |
032.txt | AC | 1257 ms | 206376 KB |
033.txt | AC | 20 ms | 2648 KB |
034.txt | AC | 626 ms | 100152 KB |
035.txt | AC | 1036 ms | 165416 KB |
036.txt | AC | 582 ms | 98232 KB |
037.txt | AC | 21 ms | 2904 KB |
038.txt | AC | 1398 ms | 206376 KB |
039.txt | AC | 20 ms | 2648 KB |
040.txt | AC | 20 ms | 2648 KB |
041.txt | AC | 1283 ms | 206376 KB |
042.txt | AC | 1249 ms | 206376 KB |
043.txt | AC | 21 ms | 2776 KB |
044.txt | AC | 21 ms | 2776 KB |
045.txt | AC | 21 ms | 2776 KB |
046.txt | AC | 21 ms | 2776 KB |
047.txt | AC | 21 ms | 2776 KB |
048.txt | AC | 21 ms | 2776 KB |
049.txt | AC | 21 ms | 2776 KB |
example0.txt | AC | 21 ms | 2776 KB |
example1.txt | AC | 35 ms | 6104 KB |