private static void FastThreeSumCalc(string[] args)
{
if (args.Length == 0)
{
System.Console.WriteLine("需要在参数中指定问题规模! \n放弃计算...");
return;
}
int count = int.Parse(args[0]);
for (int i = 1; i <= 5; i++)
{
int size = count * Convert.ToInt32(Math.Pow(2, i));
var arr = ThreeSum.GetRandomArray(size);
var watch = new Stopwatch();
watch.Start();
var result = FastThreeSum.Count(arr);
watch.Stop();
var ts = watch.Elapsed;
System.Console.WriteLine();
System.Console.WriteLine($"快速-消耗时间: {ts.TotalMilliseconds} ms ({ts.TotalSeconds} s)");
System.Console.WriteLine($"快速-问题规模: {arr.Length}");
System.Console.WriteLine($"快速-求解结果(三个数和为 0 的个数): {result}");
System.Console.WriteLine();
}
}
private static void TestThreeSum(int[] nums, IList <IList <int> > expected)
{
ThreeSum threeSum = new ThreeSum();
IList <IList <int> > actual = threeSum.GetThreeSum(nums);
Assert.AreEqual(expected, actual);
}
public void threeSumTest()
{
foreach (ThreeSumTestData testData in TestDataList)
{
Console.WriteLine("Testing => Input: [{0}]", string.Join(", ", testData.InputArray));
IList <IList <int> > result = ThreeSum.threeSum(testData.InputArray);
int i = 0;
while ((testData.OutputList.Count == result.Count) && (i < result.Count) && (i < testData.OutputList.Count))
{
Console.WriteLine("Result set " + (i + 1) + " :");
Console.Write("Expected output: ");
foreach (var output in testData.OutputList[i])
{
Console.Write(output + ", ");
}
Console.WriteLine();
Console.Write("Actual output: ");
foreach (var output in result[i])
{
Console.Write(output + ", ");
}
Console.WriteLine();
CollectionAssert.AreEqual((List <int>)result[i], (List <int>)testData.OutputList[i],
"result sets are not equal");
i++;
}
}
}
public void TestThreeSum()
{
var threeSumSolver = new ThreeSum();
int[] nums = new int[] { -1, 0, 1, 2, -1, -4 };
var result = threeSumSolver.CalculateThreeSum(nums);
}
public void FirstTry_Basic_Test()
{
int[] nums = new int[] { 30, -40, -20, -10, 40, 0, 10, 5 };
List <int[]> result = new ThreeSum().FirstTry(nums);
Assert.Equal(4, result.Count);
}
public void FirstTry_Null_Test()
{
int[] nums = null;
List <int[]> result = new ThreeSum().FirstTry(nums);
Assert.Empty(result);
}
// 将 a[i] + a[j] + a[k] 改为 (long)a[i] + a[j] + a[k] 即可。
// 此时整个式子将按照精度最高（也就是 long）的标准计算。
static void Main(string[] args)
{
int[] a = new int[4];
a[0] = int.MaxValue;
a[1] = int.MaxValue;
a[2] = int.MinValue;
a[3] = 1;
Console.WriteLine(ThreeSum.Count(a));//2
}
public void AllZeros()
{
Assert.AreEqual(
new List <IList <int> >
{
new List <int> {
0, 0, 0
}
}
, ThreeSum.FindAll(new int[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }));
}
public void intput__2_0_0_2_2_shouldReturn_1set()
{
var inputNum = new int[] { -2, 0, 0, 2, 2 };
ArrayList targetList = new ArrayList();
targetList.Add(new int[] { -2, 0, 2 });
var actual = ThreeSum.calThreeSum(inputNum);
var comparer = Comparer <object> .Create((a, b) => ((int[])a).SequenceEqual((int[])b)? 0 : 1);
CollectionAssert.AreEqual(targetList, actual, comparer);
}
public void Given_an_array_when_call_three_sum_then_return_all_unique_triplets_that_sum_is_zero()
{
var solution = new ThreeSum();
var result = solution.Sum(_numbers);
Assert.Equal(_expected, result);
var result1 = solution.Sums(_numbers);
Assert.Equal(_expected, result1);
}
public void ThreeSumTest5()
{
//Arrange
var sut = new ThreeSum(); //sut: system under test
var nums = new int[] { 82597, -9243, 62390, 83030, -97960, -26521, -61011, 83390, -38677, 12333, 75987, 46091, 83794, 19355, -71037, -6242, -28801, 324, 1202, -90885, -2989, -95597, -34333, 35528, 5680, 89093, -90606, 50360, -29393, -27012, 53313, 65213, 99818, -82405, -41661, -3333, -51952, 72135, -1523, 26377, 74685, 96992, 92263, 15929, 5467, -99555, -43348, -41689, -60383, -3990, 32165, 65265, -72973, -58372, 12741, -48568, -46596, 72419, -1859, 34153, 62937, 81310, -61823, -96770, -54944, 8845, -91184, 24208, -29078, 31495, 65258, 14198, 85395, 70506, -40908, 56740, -12228, -40072, 32429, 93001, 68445, -73927, 25731, -91859, -24150, 10093, -60271, -81683, -18126, 51055, 48189, -6468, 25057, 81194, -58628, 74042, 66158, -14452, -49851, -43667, 11092, 39189, -17025, -79173, 13606, 83172, 92647, -59741, 19343, -26644, -57607, 82908, -20655, 1637, 80060, 98994, 39331, -31274, -61523, 91225, -72953, 13211, -75116, -98421, -41571, -69074, 99587, 39345, 42151, -2460, 98236, 15690, -52507, -95803, -48935, -46492, -45606, -79254, -99851, 52533, 73486, 39948, -7240, 71815, -585, -96252, 90990, -93815, 93340, -71848, 58733, -14859, -83082, -75794, -82082, -24871, -1 };
//Act
var result = sut.GetThreeSum(nums);
//Assert
Assert.Equal(3, result.Count);
}
public void ThreeSumTest4()
{
//Arrange
var sut = new ThreeSum(); //sut: system under test
var nums = new int[] { 34, 55, 79, 28, 46, 33, 2, 48, 31, -3, 84, 71, 52, -3, 93, 15, 21, -43, 57, -6, 86, 56, 94, 74, 83, -14, 28, -66, 46, -49, 62, -11, 43, 65, 77, 12, 47, 61, 26, 1, 13, 29, 55, -82, 76, 26, 15, -29, 36, -29, 10, -70, 69, 17, 49 };
//Act
var result = sut.GetThreeSum(nums);
//Assert
Assert.Equal(43, result.Count);
}
public void ThreeSumTest1()
{
//Arrange
var sut = new ThreeSum(); //sut: system under test
var nums = new int[] { -1, 0, 1, 2, -1, -4 };
//Act
var result = sut.GetThreeSum(nums);
//Assert
Assert.Equal(2, result.Count);
}
public void GetThreeSum_ShouldReturn_ThreeSum(
int[] nums,
int expectedThreeSumCount)
{
// Arrange
var threeSum = new ThreeSum();
// Act
var result = threeSum.GetThreeSum(nums);
// Assert
result.Count.Should().Be(expectedThreeSumCount);
}
public void Case1()
{
var nums = new int[] { -1, 0, 1, 2, -1, -4 };
var results = new ThreeSum().Go(nums);
Assert.AreEqual(2, results.Count);
CollectionAssert.AreEqual(new List <int> {
-1, 0, 1
}, results[0].ToList());
CollectionAssert.AreEqual(new List <int> {
-1, -1, 2
}, results[1].ToList());
}
public void ThreeSum_four_zero()
{
int[] nums = new[] { 0, 0, 0, 0 };
var result = new List <List <int> >()
{
new List <int>()
{
0, 0, 0
},
};
Assert.AreEqual(result, ThreeSum.ThreeSumFunc(nums));
}
/// <summary>
/// 返回对 n 个随机整数的数组进行一次 ThreeSum 所需的时间。
/// </summary>
/// <param name="n">随机数组的长度。</param>
/// <returns>运行时间，单位为毫秒。</returns>
public static double TimeTrial(int n)
{
var a = new int[n];
var random = new Random(DateTime.Now.Millisecond);
for (var i = 0; i < n; i++)
{
a[i] = random.Next(-MaximumInteger, MaximumInteger);
}
var timer = new Stopwatch();
ThreeSum.Count(a);
return(timer.ElapsedTime());
}
public static double timeTrial(int i)
{
int num = 1000000;
int[] array = new int[i];
for (int j = 0; j < i; j++)
{
array[j] = StdRandom.uniform(-num, num);
}
Stopwatch stopwatch = new Stopwatch();
ThreeSum.count(array);
return(stopwatch.elapsedTime());
}
public void NormalCases()
{
Assert.AreEqual(
new List <IList <int> >
{
new List <int> {
-1, -1, 2
},
new List <int> {
-1, 0, 1
},
}
, ThreeSum.FindAll(new int[] { -1, 0, 1, 2, -1, -4 }));
}
private static void ThreeSumCalc(int count)
{
var arr = ThreeSum.GetRandomArray(count);
var watch = new Stopwatch();
watch.Start();
var result = ThreeSum.Count(arr);
watch.Stop();
var ts = watch.Elapsed;
System.Console.WriteLine();
System.Console.WriteLine($"消耗时间: {ts.TotalMilliseconds} ms ({ts.TotalSeconds} s)");
System.Console.WriteLine($"问题规模: {arr.Length}");
System.Console.WriteLine($"求解结果(三个数和为 0 的个数): {result}");
System.Console.WriteLine();
}
// 由于数组已经排序（从小到大），负数在左侧，正数在右侧。
// TwoSumFaster
// 设最左侧下标为 lo，最右侧下标为 hi。
// 如果 a[lo] + a[hi] > 0, 说明正数太大，hi--。
// 如果 a[lo] + a[hi] < 0，说明负数太小，lo++。
// 否则就找到了一对和为零的整数对，lo++, hi--。
//
// ThreeSumFaster
// 对于数组中的每一个数 a，ThreeSum 问题就等于求剩余数组中所有和为 -a 的 TwoSum 问题。
// 只要在 TwoSumFaster 外层再套一个循环即可。
static void Main(string[] args)
{
char[] split = new char[1] {
'\n'
};
string[] testCases = TestCase.Properties.Resources._1Kints.Split(split, StringSplitOptions.RemoveEmptyEntries);
int[] a = new int[testCases.Length];
for (int i = 0; i < testCases.Length; i++)
{
a[i] = int.Parse(testCases[i]);
}
Array.Sort(a);
Console.WriteLine(TwoSum.Count(a));
Console.WriteLine(TwoSumFaster(a));
Console.WriteLine(ThreeSum.Count(a));
Console.WriteLine(ThreeSumFaster(a));
}
/// <summary>
/// 返回对 n 个随机整数的数组进行一次 ThreeSum 所需的时间。
/// </summary>
/// <param name="n">随机数组的长度。</param>
/// <param name="repeatTimes">重复测试的次数。</param>
/// <returns></returns>
public static double TimeTrial(int n, int repeatTimes)
{
int[] a = new int[n];
double sum = 0;
Random random = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < n; i++)
{
a[i] = random.Next(-MAXIMUM_INTEGER, MAXIMUM_INTEGER);
}
for (int i = 0; i < repeatTimes; i++)
{
Stopwatch timer = new Stopwatch();
ThreeSum.Count(a);
sum += timer.ElapsedTime();
}
return(sum / repeatTimes);
}
/// <summary>
/// 返回对 n 个随机整数的数组进行一次 ThreeSum 所需的时间。
/// </summary>
/// <param name="n">随机数组的长度。</param>
/// <param name="repeatTimes">重复测试的次数。</param>
/// <returns></returns>
public static double TimeTrial(int n, int repeatTimes)
{
var a = new int[n];
double sum = 0;
var random = new Random(DateTime.Now.Millisecond);
for (var i = 0; i < n; i++)
{
a[i] = random.Next(-MaximumInteger, MaximumInteger);
}
for (var i = 0; i < repeatTimes; i++)
{
var timer = new Stopwatch();
ThreeSum.Count(a);
sum += timer.ElapsedTime();
}
return(sum / repeatTimes);
}
public void ThreeSum_Test()
{
int[] nums = new[] { -1, 0, 1, 2, -1, -4 };
var result = new List <List <int> >()
{
new List <int>()
{
-1, -1, 2
},
new List <int>()
{
-1, 0, 1
}
};
Assert.AreEqual(result, ThreeSum.ThreeSumFunc(nums));
}
public void Test3Sum()
{
var target = new ThreeSum();
var expected = new List <List <int> >()
{
new List <int> {
1, 0, -1
},
new List <int> {
1, 1, -2
}
};
var inputs = new [] { 1, 0, 1 - 2, -1 };
var actual = target.GetThreeSum(inputs);
Assert.AreEqual(expected, actual);
}
private static void FastTwoSumCalc(string[] args)
{
if (args.Length == 0)
{
System.Console.WriteLine("需要在参数中指定问题规模! \n放弃计算...");
return;
}
int count = int.Parse(args[0]);
var arr = ThreeSum.GetRandomArray(count);
var watch = new Stopwatch();
watch.Start();
var result = FastTwoSum.Count(arr);
watch.Stop();
var ts = watch.Elapsed;
System.Console.WriteLine($"快速两数相加: {result}, 耗时: {ts.TotalSeconds} S");
}
static void Main(string[] args)
{
var ints = In.ReadInts("1Kints.txt").ToArray();
Stopwatch watch = new Stopwatch();
watch.Start();
var triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine(String.Format("The number of zero sum triplets is {0} for 1Kints, process performed in {1} seconds.", triplets, watch.Elapsed));
ints = In.ReadInts("2Kints.txt").ToArray();
watch = new Stopwatch();
watch.Start();
triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine(String.Format("The number of zero sum triplets is {0} for 2Kints, process performed in {1} seconds.", triplets, watch.Elapsed));
ints = In.ReadInts("4Kints.txt").ToArray();
watch = new Stopwatch();
watch.Start();
triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine(String.Format("The number of zero sum triplets is {0} for 4Kints, process performed in {1} seconds.", triplets, watch.Elapsed));
ints = In.ReadInts("8Kints.txt").ToArray();
watch = new Stopwatch();
watch.Start();
triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine(String.Format("The number of zero sum triplets is {0} for 8Kints, process performed in {1} seconds.", triplets, watch.Elapsed));
ints = In.ReadInts("16Kints.txt").ToArray();
watch = new Stopwatch();
watch.Start();
triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine(String.Format("The number of zero sum triplets is {0} for 16Kints, process performed in {1} seconds.", triplets, watch.Elapsed));
Console.ReadLine();
}
public void FastVsSlow(string file, int expectedCount, int timeoutInSeconds)
{
string actualFilePath = $"../../data/{file}";
if (!File.Exists(actualFilePath))
{
throw new InvalidOperationException(file);
}
int[] intArray = File.ReadAllLines(actualFilePath).Select(s => int.Parse(s)).ToArray();
var fast = Helper.Time(() => ThreeSumFast.Count(intArray), "3SumFast");
Assert.Equal(expectedCount, fast.Item1);
var slow = Helper.Time(() => ThreeSum.Count(intArray), "3SumSlow");
Assert.Equal(expectedCount, slow.Item1);
Assert.True(fast.Item2 < slow.Item2);
Assert.True(fast.Item2 + slow.Item2 < timeoutInSeconds * 1000);
}
private static void ThreeSumTest()
{
Console.WriteLine("\n3 Sum question:");
ThreeSum threeSum = new ThreeSum();
IList <int[]> testNumberArrays = new List <int[]> {
new int[] { -1, 0, 1, 2, -1, -4 }
};
foreach (int[] array in testNumberArrays)
{
Console.WriteLine("[{0}] -> [", string.Join(", ", array));
IList <IList <int> > solution = threeSum.ThreeSumOne(array);
foreach (List <int> set in solution)
{
Console.WriteLine("[{0}],", string.Join(", ", set));
}
Console.WriteLine("]");
}
}
// самые первые занятия, когда показывался подсчет времени
private static void TestTimeComplexityOnKints()
{
/// 1 => 160ms
/// 2 => 1.35s
/// 4 => 10.26s
/// 8 => 1m20s
///
var ints = In.ReadInts("4Kints.txt").ToArray();
var watch = new Stopwatch();
watch.Start();
var triplets = ThreeSum.Count(ints);
watch.Stop();
Console.WriteLine($"The number of \"zero-triplets\" : {triplets}");
Console.WriteLine($"Time taken: {watch.Elapsed:g}");
Console.Read();
}
