Mapping

    1#include <bits/stdc++.h>
    2using namespace std;
    3using ll = long long;
    4using i128 = __int128;
    5const int inf = 1e9;
    6const ll INF = 2e18; //❄️
    7int main() {
    8    ios::sync_with_stdio(0); cin.tie(0); 
    9    int n, m; cin >> n >> m;
    10    vector<int> vis(m + 1);
    11    for (int i = 0; i < n; i++) {
    12        int x; cin >> x;
    13        vis[x]++;
    14    }
    15    bool ok1 = 1, ok2 = 1;
    16    for (int i = 1; i <= m; i++) {
    17        if (vis[i] > 1) ok1 = 0;
    18        if (!vis[i]) ok2 = 0;
    19    }
    20    if (ok1) cout << "Yes" << '\n';
    21    else cout << "No" << '\n';
    22    if (ok2) cout << "Yes" << '\n';
    23    else cout << "No" << '\n';
    24    return 0;
    25}