public class EditDistance {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    String str1 = "march";
    String str2 = "cart";
    
    EditDistance ed = new EditDistance();
    System.out.println(ed.getMinConversions(str1, str2));
}

public int getMinConversions(String str1, String str2){
    int dp[][] = new int[str1.length()+1][str2.length()+1];
    for(int i=0;i<=str1.length();i++){
        for(int j=0;j<=str2.length();j++){
            if(i==0)
                dp[i][j] = j;
            else if(j==0)
                dp[i][j] = i;
            else if(str1.charAt(i-1) == str2.charAt(j-1))
                dp[i][j] = dp[i-1][j-1];
            else{
                dp[i][j] = 1 + Math.min(dp[i-1][j], Math.min(dp[i][j-1], dp[i-1][j-1]));
            }
        }
    }
    return dp[str1.length()][str2.length()];
}