using System;
public class Program
{
public static bool isSecondStringSubsequenceOfFirstString(string first, string second) {
int i = 0, j = 0;
while (i < first.Length) {
if (j >= second.Length) {
return false;
}
if (first[i] == second[j]) {
Console.Write("first[i] = " + first[i] + " second[j] = " + second[j]);
Console.WriteLine(" i = " + i + " j = " + j);
i++;
}
j++;
}
return true;
}
public static void Main(string[] args)
{
string first = "c# programming";
string second = "c# pro programming";
Console.WriteLine(isSecondStringSubsequenceOfFirstString(first, second) ? "yes" : "no");
}
}
/*
run:
first[i] = c second[j] = c i = 0 j = 0
first[i] = # second[j] = # i = 1 j = 1
first[i] = second[j] = i = 2 j = 2
first[i] = p second[j] = p i = 3 j = 3
first[i] = r second[j] = r i = 4 j = 4
first[i] = o second[j] = o i = 5 j = 5
first[i] = g second[j] = g i = 6 j = 10
first[i] = r second[j] = r i = 7 j = 11
first[i] = a second[j] = a i = 8 j = 12
first[i] = m second[j] = m i = 9 j = 13
first[i] = m second[j] = m i = 10 j = 14
first[i] = i second[j] = i i = 11 j = 15
first[i] = n second[j] = n i = 12 j = 16
first[i] = g second[j] = g i = 13 j = 17
yes
*/
