HW #2 sol

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
#define _FastIO ios_base::sync_with_stdio(0); cin.tie(0)
#define F first
#define S second

signed main()
{
    _FastIO;
    /*
    // A
    string a , b;
    cin >> a >> b;
    int cnt = 0;
    for(int i = 0; i < a.size(); i++){
        if(a[i] != b[i])
            cnt++;
    }
    cout << cnt << '\n';
    */
    /*
    // B
    int n , x , cnt = 0;
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> x;
        if(i % 2 && x % 2)
            cnt++;
    }
    cout << cnt << '\n';
    */
    /*
    // C
    int n;
    cin >> n;
    int a[n + 5];
    for(int i = 0; i < n; i++)
        cin >> a[i];

    sort(a , a + n);

    for(int i = 1; i < n; i++){
        if(a[i] > a[i - 1] + 1){
            cout << a[i] - 1 << '\n';
        }
    }
    */
    /*
    // D
    int n;
    cin >> n;
    int a[n + 5];
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    cout << a[0] << " ";
    for(int i = 1; i < n; i++){
        cout << a[i] - a[i - 1] << " ";
    }
    cout << '\n';
    */
    /*
    // E
    string a[3];
    set<string> s;
    for(int i = 0; i < 3; i++){
        cin >> a[i];
        s.insert(a[i]);
    }
    vector<string> v = {"ABC", "ARC", "AGC", "AHC"};
    for(string i : v){
        if(!s.count(i))
            cout << i << '\n';
    }
    */

    // F
    /*
    int n , k;
    cin >> n >> k;
    int a[n + 5];
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    sort(a , a + n);
    int sum = 0;
    for(int i = 0; i < k; i++){
        sum += a[i];
    }
    cout << sum << '\n';
    */
    /*
    map<char , int> cnt;
    cnt['A'] = 0;
    cnt['B'] = 3;
    cnt['C'] = 4;
    cnt['D'] = 8;
    cnt['E'] = 9;
    cnt['F'] = 14;
    cnt['G'] = 23;
    char a , b;
    cin >> a >> b;
    cout << abs(cnt[a] - cnt[b]) << '\n';
    */
    /*
    // I
    int l , r;
    cin >> l >> r;
    l--; r--;
    string s;
    cin >> s;
    reverse(s.begin() + l , s.begin() + r + 1);
    cout << s << '\n';
    */
    /*
    // J
    string a , b;
    cin >> a >> b;
    if(b.substr(0 , a.size()) == a)
        cout << "Yes";
    else
        cout << "No";
    */
}