Created
June 11, 2021 00:49
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Задача: Найти подмассивы, где сумма элементов равна заданному числу K
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using System; | |
using System.Collections.Generic; | |
public class Program | |
{ | |
public static int FindSumOfSubarray(int[] arr, int k) | |
{ | |
int total = 0; | |
int partSum = 0; | |
int len = arr.Length; | |
var dict = new Dictionary<int, int>(); | |
dict.Add(0, 1); | |
for (int i = 0; i < len; i++) | |
{ | |
partSum += arr[i]; | |
// found a subarray that sum of this subarray equals k | |
if (dict.ContainsKey(partSum - k)) | |
{ | |
total += dict[partSum - k]; | |
} | |
// add new part sum to dictionary | |
if (!dict.ContainsKey(partSum)) | |
{ | |
dict[partSum] = 0; | |
} | |
dict[partSum] += 1; | |
} | |
return total; | |
} | |
public static void Main() | |
{ | |
Console.WriteLine("UniLecs"); | |
// Tests | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1, 2, 3 }, 3)); // 2 | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1, 2, 3 }, 4)); // 0 | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1, 2, 3 }, 5)); // 1 | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1, 1, 1 }, 2)); // 2 | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1, -1, 0 }, 0)); // 3 | |
Console.WriteLine(FindSumOfSubarray(new int[] { 1 }, 0)); // 0 | |
} | |
} |
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