1st, C++ (gcc) - rextester

1st

#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
#define mp make_pair
#define pb push_back
#define pii pair<int, int>

ll n, k, v;

int gcd(ll a, ll b){
    if(b == 0) return a;
    return gcd(b, a%b);
}

vector<int> solve(int i, ll timer){
    //cout << i << " " << timer << endl;
    vector<int> trms;
    for(int j = 0; j < timer; j++)
        for(int k = 0; k < n; k++) trms.pb(k);
        
    vector<int> ans;
    i = i*k - 1;
    int j = k;
    while(j--) ans.pb(trms[i--]);
    return ans;
}

int main(){
    ios_base :: sync_with_stdio(0);
    cin.tie(0);
    
    int t;
    cin >> t;
    for(int i = 1; i <= t; i++){
        cin >> n >> k >> v;
        vector<string> a(n);
        for(int j = 0; j < n; j++) cin >> a[j];
        ll g = gcd(n, k);
        ll timer = n*k/g;
        
        int x = v%timer;
        if(x == 0) x = timer;
        vector<int> ind = solve(x, timer);
        
        sort(ind.begin(), ind.end());
        cout << "Case #" << i << ": ";
        for(auto i : ind) cout << a[i] << " "; cout << endl;
    }
    return 0;
}


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