Answer / jayakrishnan

strings[0].Substring(0,GetIndex(strings));

public static int GetIndex(string[] s)
{
int index=0;
for (int i = 0; i <= s.Length; i++)
{
if (i == s[0].Length) return i;
char comp = s[0][i];
for (int j = 1; j <= s[i].Length; j++)
{
if (j == s.Length)
{
index = j;
break;
}
if (i >= s[j].Length)
{
index = s[j].Length;
return index;
}
if (comp != s[j][i])
{
index = i;
return index;
}
}
}
return index;
}

Answer / naresh

public class commonprefix
{
private static String CommonPrefix(String[] ss)
{
if (ss.length == 0)
{
return "";
}

if (ss.length == 1)
{
return ss[0];
}

int prefixLength = 0;

for(char c:ss[0].toCharArray())
{
for(String s:ss)
{
if (s.length()<= prefixLength ||
s.charAt(prefixLength)!= c)
{
return ss[0].substring(0, prefixLength);
}
}
prefixLength++;
}

return ss[0]; // all strings identical
}
public static void main(String args[])
{
System.out.println(""+CommonPrefix(args));

}
}

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