Submission #703739

#	Time	Username	Problem	Language	Result	Execution time	Memory
703739		LittleCube	Naan (JOI19_naan)	C++14	29 / 100	4045 ms	6064 KiB

naan

#include <bits/stdc++.h>
#define int long long
#define ll long long
#define pii pair<int, int>
#define F first
#define S second
using namespace std;

const bool LittleCubeIsBurningChicken = true;

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

ll N, L, v[2005][2005], sum[2005];

int abtodc(int a, int b, int c)
{
    return (b * c + a - 1) / a;
}

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> N >> L;
    // why divide by N?
    // how to solve using only fractions? -> we can discard leftovers (things cannot be converted to current fraction) from last person
    // is it guarnteed to always have a solution? -> yes (at least for N <= 6)
    // why?
    for (int i = 1; i <= N; i++)
    {
        for (int j = 1; j <= L; j++)
        {
            cin >> v[i][j];
            // sum >= sum of v / N
            // sum * N >= sum of v
            sum[i] += v[i][j];
            v[i][j] *= N;
        }
    }
    vector<int> p;
    for (int i = 1; i <= N; i++)
        p.emplace_back(i);
    do
    {
        pii last = {0, 1};
        int nxt = 1;
        vector<pii> sol;
        for (auto i : p)
        {
            ll tmp = sum[i];
            while (nxt <= L && tmp >= v[i][nxt] - abtodc(last.S, last.F, v[i][nxt]))
                tmp -= v[i][nxt] - abtodc(last.S, last.F, v[i][nxt]), last = {0, 1}, nxt++;
            last = {abtodc(last.S, last.F, v[i][nxt]), v[i][nxt]};
            last.F += tmp;
            if (last.F + (nxt - 1) * last.S > L * last.S)
                goto ono;
            sol.emplace_back(pii{last.F + last.S * (nxt - 1), last.S});
        }
        sol.pop_back();

        for (auto [a, b] : sol)
            cout << a << ' ' << b << '\n';
        for (auto i : p)
            cout << i << ' ';
        cout << '\n';
        return 0;
    ono:
        shuffle(p.begin(), p.end(), rd);
    } while (LittleCubeIsBurningChicken);
}

Compilation message (stderr)

naan.cpp: In function 'int main()':
naan.cpp:61:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   61 |         for (auto [a, b] : sol)
      |                   ^

• Subtask 1: 5 / 5
• Subtask 2: 24 / 24
• Subtask 3: 0 / 71