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++ (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define inf 1001001001001001001
#define mod 1000000007
#define mod2 998244353
#define pi acos(-1)
#define all(v) v.begin(),v.end()
int main(){
    string s,t;
    cin>>s>>t;
    int N=t.size();
    int max2=0;
    int count=0;
    rep(i,s.size()-t.size()){
        rep(j,t.size()){
            if(s.at(i)==t.at(j)){
                count++;
                break;
            }else{
                if(max2<count){
                    max2=count;
                }
                count=0;
            }
        }
    }
    if(max2<count){
        max2=count;
    }
    count=0;
    int max3=0;
    for(int i=s.size()-t.size();i<s.size();i++){
        if(s.at(i)==t.at(i-s.size()+t.size())){
            count++;
        }else{
            if(max3<count){
                max3=count;
            }
            count=0;
        }
    }
    if(max3<count){
        max3=count;
    }
    cout<<N-max(max2,max3)<<endl;
}