Code
#include <bits/stdc++.h>
using namespace std;

// Function to check if S1 is a subsequence of S2
bool isSubsequence(string &S1, string &S2) {
    int i = 0, j = 0;  // Pointers for string S1 and S2

    // Iterate until reaching the end of either string
    for (; i < S1.length() && j < S2.length(); j++) {
        if (S1[i] == S2[j]) {
            i++;  // Increment i if characters match
        }
    }

    // Return true if all characters of S1 are found in S2 in order
    return (i == S1.length());
}

int main() {
    string S1 = "tuf", S2 = "takeuforward";

    if (isSubsequence(S1, S2))  // Check if S1 is a subsequence of S2
        cout << S1 << " is a subsequence of " << S2 << endl;
    else
        cout << S1 << " is not a subsequence of " << S2 << endl;

    return 0;
}
class Solution {
    // Function to check if S1 is a subsequence of S2
    public bool