Submission #73552944

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Source Code Expand

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

#define ll long long
#define all(v) v.begin(), v.end()
#define memo(v, x) memset(v, x, sizeof(v))
#define sz(v) (int)v.size()

void solve() {
    int n, m;
    cin >> n >> m;
    set<int> seen;
    for (int i = 0; i < n; i++) {
        int k; cin >> k;
        bool taken = false;
        while (k--) {
            int x; cin >> x;
            if (taken) continue;
            if (!seen.count(x)) {
                cout << x << '\n';
                seen.insert(x);
                taken = true;
            }
        }
        if (!taken) cout << "0\n";
    }
}

int32_t main() {
    cin.tie(0) -> sync_with_stdio(0);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    int tc = 1;
    // cin >> tc;
    for (int t = 1; t <= tc; t++) {
        solve();
    }
    return 0;
}

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