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Program.cs
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Program.cs
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using System;
namespace MissingNumber
{
class Program
{
static void Main(string[] args)
{
int[] nums = { 3, 0, 1 };
Console.WriteLine(MissingNumber(nums));
}
static int MissingNumber(int[] nums)
{
int res = 0;
int[] record = new int[nums.Length + 1];
foreach (var num in nums)
record[num]++;
for (int i = 0; i < record.Length; i++)
{
if (record[i] == 0)
res = i;
}
return res;
}
static int MissingNumber2(int[] nums)
{
int expectedSum = nums.Length * (nums.Length + 1) / 2;
foreach (var num in nums)
expectedSum -= num;
return expectedSum;
}
}
}