Problem:
Score : 200 points

Problem Statement

Given are two strings S and T.

Let us change some of the characters in S so that T will be a substring of S.

At least how many characters do we need to change?

Here, a substring is a consecutive subsequence. For example, xxx is a substring of yxxxy, but not a substring of xxyxx.

Constraints

The lengths of S and T are each at least 1 and at most 1000.

The length of T is at most that of S.

S and T consist of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S
T

Output

Print the minimum number of characters in S that need to be changed.

Sample Input 1

cabacc
abc

Sample Output 1

1

For example, changing the fourth character a in S to c will match the second through fourth characters in S to T.

Since S itself does not have T as its substring, this number of changes - one - is the minimum needed.

Sample Input 2

codeforces
atcoder

Sample Output 2

6

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
 
namespace Sample
{
  // 拡張クラス
  static class Sample
  {
    static void Main()
    {
      string s = Console.ReadLine();
      string t = Console.ReadLine();
      
      string[] sarr =  s.MySplit(1);
      string[] tarr =  t.MySplit(1);

      int score = tarr.Length;

      for(int i=0; i<=(sarr.Length-tarr.Length); i++){
          int subcount = 0;
          for(int j=0; j<tarr.Length; j++){
              if(!sarr[i+j].Equals(tarr[j])){
                  subcount++;
              }
          }
          if (subcount < score) {
              score = subcount;
          }
    
        }
        Console.WriteLine(Convert.ToString(score));
    }  
    
    // 拡張メソッド
    static string[] MySplit(this string str, int count) {
      var list = new List<string>();
      int length = (int)Math.Ceiling((double)str.Length / count);
      
      for(int i = 0; i < length; i++) {
        int start = count * i;
        if(str.Length <= start) {
          break;
        }
        if(str.Length < start + count) {
          list.Add(str.Substring(start));
        } else {
          list.Add(str.Substring(start, count));
        }
      }
      
      return list.ToArray();
    }
  }
}