problem code = MARBLE
contest = INFI21B
my code …
import java.util.;
import java.lang.;
import java.io.*;
/* Name of the class has to be “Main” only if the class is public. */
class Codechef
{
public static void main (String[] args) throws java.lang.Exception
{
// your code goes here
Scanner s = new Scanner(System.in);
int cases = s.nextInt();
while(cases–>0){
int n = s.nextInt();
String S =s.next();
String P =s.next();
char[] c1 = new char[n];
char[] c2 = new char[n];
for(int i=0;i<n;i++){
if(S.charAt(i) == '?' && P.charAt(i) == '?' ){
c1[i] = 'e';
c2[i] = 'e';
}
else if(S.charAt(i) == '?'){
c1[i] = 'e';
c2[i] = P.charAt(i);
}
else if(P.charAt(i) == '?'){
c2[i] ='e';
c1[i] = S.charAt(i);
}
else{
c1[i] = S.charAt(i);
c2[i] = P.charAt(i);
}
}
int count =0;
for(int i=0;i<n;i++){
if(c1[i] == c2[i]){
count =count;
}
else if(c1[i] == 'a' || c1[i] == 'e' || c1[i] == 'i' || c1[i] == 'o' || c1[i] == 'u' ){
if(c2[i] == 'a' || c2[i] == 'e' || c2[i] == 'i' || c2[i] == 'o' || c2[i] == 'u'){
count = count + 2;
}
else{
count++;
}
}
else if(c1[i] == 'b' || c1[i] == 'c' || c1[i] == 'd' || c1[i] == 'f' || c1[i] == 'g' || c1[i] == 'h' || c1[i] == 'j' || c1[i] == 'k' || c1[i] == 'l' || c1[i] == 'm' || c1[i] == 'n' || c1[i] == 'p' || c1[i] == 'q' || c1[i] == 'r' || c1[i] == 's' || c1[i] == 't' || c1[i] == 'v' || c1[i] == 'x' || c1[i] == 'y' || c1[i] == 'z' ){
if(c2[i] == 'b' || c2[i] == 'c' || c2[i] == 'd' || c2[i] == 'f' || c2[i] == 'g' || c2[i] == 'h' || c2[i] == 'j' || c2[i] == 'k' || c2[i] == 'l' || c2[i] == 'm' || c2[i] == 'n' || c2[i] == 'p' || c2[i] == 'q' || c2[i] == 'r' || c2[i] == 's' || c2[i] == 't' || c2[i] == 'v' || c2[i] == 'x' || c2[i] == 'y' || c2[i] == 'z' ){
count = count + 2;
}
else{
count++;
}
}
}
System.out.println(count);
}
}
}