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editDistance.java
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80 lines (79 loc) · 2.05 KB
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public class editDistance {
public static void main(String[] args)
{
int m=4,n=6;
String st1="geek";
String st2="gaseek";
int res=editdistanceTabulated(st1,st2,m,n,new int[m+1][n+1]);
System.out.println(res);
}
static int editdistance(String s1,String s2,int m,int n)
{
if(m==0)
{
return n;
}
if(n==0)
{
return m;
}
if(s1.charAt(m-1)==s2.charAt(n-1))
{
return editdistance(s1,s2,m-1,n-1);
}
int a = editdistance(s1,s2,m-1,n);
int b = editdistance(s1,s2, m,n-1);
int c = editdistance(s1,s2,m-1,n-1);
return 1+Math.min(a,Math.min(b,c));
}
static int editdistanceMemoized(String st1,String st2,int m,int n,int[][] dp)
{
if(m==0)
{
return n;
}
if(n==0)
{
return m;
}
if(dp[m][n]!=0)
{
return dp[m][n];
}
if(st1.charAt(m-1)==st2.charAt(n-1))
{
return editdistanceMemoized(st1,st2,m-1,n-1,dp);
}
int a = editdistanceMemoized(st1,st2,m-1,n,dp);
int b = editdistanceMemoized(st1,st2, m,n-1,dp);
int c = editdistanceMemoized(st1,st2,m-1,n-1,dp);
dp[m][n]=1+Math.min(a,Math.min(b,c));
return dp[m][n];
}
static int editdistanceTabulated(String s1,String s2,int m,int n,int[][]dp)
{
for(int i=0;i<=m;i++)
{
for(int j=0;j<=n;j++)
{
if(i==0)
{
dp[i][j]=j;
}
else if(j==0)
{
dp[i][j]=i;
}
else if(s1.charAt(i-1)==s2.charAt(j-1))
{
dp[i][j]=dp[i-1][j-1];
}
else
{
dp[i][j]=1+Math.min(dp[i-1][j-1],Math.min(dp[i-1][j],dp[i][j-1]));
}
}
}
return dp[m][n];
}
}