private void AddSolution(Dictionary <BigInteger, Dictionary <int, Info1> > solutions, Info1 first)
{
if (!solutions.TryGetValue(first.Number, out var dict))
{
dict = new Dictionary <int, Info1>();
solutions.Add(first.Number, dict);
}
dict.Add(first.K, first);
}
private bool ContainsSolution(Dictionary <BigInteger, Dictionary <int, Info1> > solutions, Info1 first)
{
if (solutions.TryGetValue(first.Number, out var dict))
{
return(dict.ContainsKey(first.K));
}
return(false);
}
public string MinInteger(string num, int k)
{
if (tenPotence == null || tenPotence.Length < num.Length + 1)
{
tenPotence = new BigInteger[num.Length + 1];
tenPotence[0] = 1;
for (int i = 1; i < tenPotence.Length; i++)
{
tenPotence[i] = tenPotence[i - 1] * 10;
}
}
BigInteger number = BigInteger.Parse(num);
BigInteger result = number;
Dictionary <BigInteger, Dictionary <int, Info1> > solutions = new Dictionary <BigInteger, Dictionary <int, Info1> >();
LinkedList <Info1> queue1 = new LinkedList <Info1>();
queue1.AddLast(new Info1 {
Number = number, NumberLength = num.Length, K = k, NumberIndex = num.Length - 1
});
AddSolution(solutions, queue1.First.Value);
while (queue1.Count != 0)
{
var first = queue1.First.Value;
queue1.RemoveFirst();
if (first.K == 0 || first.NumberIndex == 0)
{
continue;
}
var firstDigit = (first.Number / tenPotence[first.NumberIndex]) % 10;
//LinkedList<int> indexes = new LinkedList<int>();
int theIndex = 0;
BigInteger minDigit = 10;
for (int i = 1; i <= first.K && first.NumberIndex - i > -1; i++)
{
var cDigit = (first.Number / tenPotence[first.NumberIndex - i]) % 10;
if (cDigit >= firstDigit)
{
continue;
}
if (minDigit > cDigit)
{
minDigit = cDigit;
//indexes.Clear();
//indexes.AddLast(first.NumberIndex - i);
theIndex = first.NumberIndex - i;
}
/*else if ( minDigit == cDigit)
* {
* //indexes.AddLast(first.NumberIndex - i);
* }*/
}
//if ( indexes.Count != 0)
if (minDigit < 10)
{
//foreach (var index in indexes)
//{
var rightPart = first.Number % tenPotence[theIndex];
var leftPart = (first.Number / tenPotence[first.NumberIndex + 1]) * tenPotence[first.NumberIndex + 1];
var center = (first.Number - leftPart) / tenPotence[theIndex];
var centerChanged = center / 10 + minDigit * tenPotence[first.NumberIndex - theIndex];
var newNumber = leftPart + centerChanged * tenPotence[theIndex] + rightPart;
var newInfo = new Info1 {
K = first.K - (first.NumberIndex - theIndex), Number = newNumber, NumberIndex = first.NumberIndex - 1, NumberLength = first.NumberLength
};
if (!ContainsSolution(solutions, newInfo))
{
AddSolution(solutions, newInfo);
queue1.AddFirst(newInfo);
if (newNumber < result)
{
result = newNumber;
}
}
//}
}
else
{
first.NumberIndex--;
queue1.AddLast(first);
}
}
var semiResult = result.ToString();
var sb = new StringBuilder();
for (int i = 0; i < num.Length - semiResult.Length; i++)
{
sb.Append('0');
}
sb.Append(semiResult);
return(sb.ToString());
}