Submission #378987

#	Time	Username	Problem	Language	Result	Execution time	Memory
378987		wiwiho	Gift (IZhO18_nicegift)	C++14	30 / 100	585 ms	68304 KiB

nicegift

#include <bits/stdc++.h>

#define mp make_pair
#define F first
#define S second
#define eb emplace_back
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n"; \
}

using namespace std;

typedef long long ll;

using pll = pair<ll, ll>;
using pii = pair<int, int>;

const ll MAX = 1LL << 60;

ostream& operator<<(ostream& o, pll p){
    return o << '(' << p.F << ',' << p.S << ')';
}

ll iceil(ll a, ll b){
    return (a + b - 1) / b;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n, k;
    cin >> n >> k;

    vector<ll> pos(n + 1), a(n + 1);
    ll sum = 0;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        sum += a[i];
    }

    if(sum % k){
        cout << "-1\n";
        return 0;
    }
    ll len = sum / k;

    ll now = 0;
    vector<ll> t;
    for(int i = 1; i <= n; i++){
        if(a[i] > len){
            cout << "-1\n";
            return 0;
        }
        now += a[i];
        pos[i] = (now - 1) % len;
        t.eb(pos[i]);
    }

    sort(t.begin(), t.end());
    t.resize(unique(t.begin(), t.end()) - t.begin());
    len = t.size();

    vector<vector<int>> ans(len);
    int j = -1;
    ll total = 0;
    for(int i = 1; i <= n; i++){
        int id = lower_bound(t.begin(), t.end(), pos[i]) - t.begin();
        ll cnt = 0;
        for(j = (j + 1) % len; ; j = (j + 1) % len){
            ans[j].eb(i);
            total++;
            if(j > 0) cnt += t[j] - t[j - 1];
            else cnt += t[j] + 1;
            if(j == id) break;
        }
        assert(cnt == a[i]);
    }
    cout << len << "\n";
    int lst = -1;
    for(int i = 0; i < len; i++){
        cout << t[i] - lst << " " ;
        printv(ans[i], cout);
        lst = t[i];
    }

    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 51