結果
| 問題 |
No.461 三角形はいくつ?
|
| コンテスト | |
| ユーザー |
りあん
|
| 提出日時 | 2016-12-08 02:04:05 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 2,119 ms / 5,000 ms |
| コード長 | 3,294 bytes |
| コンパイル時間 | 1,024 ms |
| コンパイル使用メモリ | 110,208 KB |
| 実行使用メモリ | 21,120 KB |
| 最終ジャッジ日時 | 2024-11-29 03:20:14 |
| 合計ジャッジ時間 | 26,824 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 |
|---|---|
| sample | AC * 4 |
| other | AC * 41 |
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc) Copyright (C) Microsoft Corporation. All rights reserved.
ソースコード
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.IO;
class Program
{
static StreamWriter sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
static Scan sc = new Scan();
static void Main()
{
int n = sc.Int;
var lines = new List<long[]>[3];
for (int i = 0; i < 3; i++)
{
lines[i] = new List<long[]>();
lines[i].Add(new long[]{ 0, 1 });
}
for (int i = 0; i < n; i++)
{
var a = sc.IntArr;
var g = mymath.gcd(a[1], a[2]);
lines[a[0]].Add(new long[]{ a[2] / g, (a[1] + a[2]) / g });
}
for (int i = 0; i < 3; i++)
lines[i].Sort((x, y) => (x[0] * y[1]).CompareTo(y[0] * x[1]));
long ans = 0;
foreach (var a in lines[0])
{
foreach (var b in lines[1])
{
if (!okay(a, b)) continue;
long s = a[0] * b[1] + a[1] * b[0], t = a[1] * b[1];
var g = mymath.gcd(s, t);
s /= g;
t /= g;
int ok = 0, ng = lines[2].Count;
while (ok < ng - 1)
{
int m = (ok + ng) >> 1;
var c = lines[2][m];
if (okay(a, c) && okay(b, c))
ok = m;
else
ng = m;
}
ans += ok + 1;
long u = t - s;
int l = 0, r = lines[2].Count - 1;
while (true)
{
int m = (l + r) >> 1;
var c = lines[2][m];
if (t * c[0] == u * c[1])
{
--ans;
break;
}
if (l >= r) break;
if (t * c[0] < u * c[1])
l = m + 1;
else
r = m - 1;
}
}
}
sw.WriteLine(ans);
sw.Flush();
}
static bool okay(long[] a, long[] b) => a[0] * b[1] + a[1] * b[0] <= a[1] * b[1];
static void DBG<T>(params T[] a) => Console.WriteLine(string.Join(" ", a));
static void DBG(params object[] a) => Console.WriteLine(string.Join(" ", a));
}
class Scan
{
public int Int => int.Parse(Str);
public long Long => long.Parse(Str);
public double Double => double.Parse(Str);
public string Str => Console.ReadLine().Trim();
public int[] IntArr => StrArr.Select(int.Parse).ToArray();
public long[] LongArr => StrArr.Select(long.Parse).ToArray();
public double[] DoubleArr => StrArr.Select(double.Parse).ToArray();
public string[] StrArr => Str.Split();
}
class mymath
{
public static long gcd(long a, long b)
{
while (b > 0) { var t = a % b; a = b; b = t; }
return a;
}
// a x + b y = gcd(a, b)
public static long extgcd(long a, long b, out long x, out long y)
{
long g = a; x = 1; y = 0;
if (b > 0) { g = extgcd(b, a % b, out y, out x); y -= a / b * x; }
return g;
}
public static long lcm(long a, long b) => a / gcd(a, b) * b;
}
りあん