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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace AvoidFloodInTheCity
{
class Program
{
static void Main(string[] args)
{
int[] rains = { 69, 0, 0, 0, 69 };
Console.WriteLine(AvoidFlood(rains));
}
static int[] AvoidFlood(int[] rains)
{
var noRainDays = new List<int>();
var res = new int[rains.Length];
var lakes = new Dictionary<int, int>();
for (int i = rains.Length - 1; i >= 0; i--)
{
if(rains[i] == 0)
noRainDays.Insert(0, i);
else
{
if (lakes.ContainsKey(rains[i]))
{
if(noRainDays.Count == 0) return new int[0];
int day = noRainDays.BinarySearch(lakes[rains[i]]);
if(day == -1) return new int[0];
res[noRainDays[-(day + 1) - 1]] = rains[i];
noRainDays.RemoveAt(-(day + 1) - 1);
}
res[i] = -1;
lakes[rains[i]] = i;
}
}
foreach (var day in noRainDays)
res[day] = 1;
return res;
}
}
}