Submission #1079346

#	Time	Username	Problem	Language	Result	Execution time	Memory
1079346		boris_mihov	JOIRIS (JOI16_joiris)	C++17	15 / 100	1 ms	348 KiB

joiris

#include <unordered_map>
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <ctime>
#include <map>

typedef long long llong;
const int MAXN = 50 + 10;
const int INF = 1e9;

int n, k;
int a[MAXN];
int cnt[MAXN];
std::vector <std::pair <int,int>> ops;

void solve()
{
    int sum = 0;
    for (int i = 1 ; i <= n ; ++i)
    {
        sum += a[i];
    }

    sum %= n;
    bool isOk = false;
    for (int i = 1 ; i <= n ; ++i)
    {
        if ((k * i + sum) % n == 0)
        {
            isOk = true;
            break;
        }
    }

    if (!isOk)
    {
        std::cout << -1 << '\n';
        return;
    }

    int max = 0;
    for (int i = 1 ; i <= n ; ++i)
    {
        max = std::max(max, a[i]);
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        while (a[i] < max)
        {
            a[i] += k;
            ops.push_back({1, i});
        }
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        a[i] -= max;
    }

    // std::cerr << "at the begining: " << ops.size() << "\n";
    // for (int i = 1 ; i <= n ; ++i)
    // {
    //     std::cerr << a[i] << ' ';
    // }

    // std::cerr << '\n';

    bool wasEven = (n % 2 == 0);
    // k = 2 from now on
    if (n % 2 == 0)
    {
        n--;
    }

    int times = 0;
    for (int i = 1 ; i + 1 <= n ; ++i)
    {
        if (a[i] == 0 && a[i + 1] == 0)
        {
            ops.push_back({2, i});
            a[i]++; a[i + 1]++;
            i++;
        }
    }

    for (int i = 1 ; i <= n ; i += 2)
    {
        if (a[i] == 0)
        {
            ops.push_back({1, i});
            for (int j = 1 ; j < i ; j += 2)
            {
                ops.push_back({2, j});
            }

            for (int j = i + 1 ; j < n ; j += 2)
            {
                ops.push_back({2, j});
            }

            a[i]++;
            times++;
        }
    }

    for (int i = 2 ; i <= n ; i += 2)
    {
        if (a[i] == 0)
        {
            ops.push_back({1, i});
            a[i] += 2;
        }
    }

    times++;
    for (int i = 1 ; i <= n ; ++i)
    {
        a[i]--;
    }

    for (int i = 1 ; i + 1 <= n ; ++i)
    {
        if (a[i] == 0 && a[i + 1] == 0)
        {
            ops.push_back({2, i});
            a[i]++; a[i + 1]++;
            i++;
        }
    }

    for (int i = 1 ; i <= n ; i += 2)
    {
        if (a[i] == 0)
        {
            ops.push_back({1, i});
            for (int j = 1 ; j < i ; j += 2)
            {
                ops.push_back({2, j});
            }

            for (int j = i + 1 ; j < n ; j += 2)
            {
                ops.push_back({2, j});
            }

            a[i]++;
            times++;
        }
    }

    if (wasEven)
    {
        n++;
        times++;
        while (a[n] < times)
        {
            a[n] += 2;
            ops.push_back({1, n});
        }

        a[n] -= times;
        for (int i = 1 ; i < n ; ++i)
        {
            a[i]--;
        }

        if (a[n])
        {
            assert(false);
        }

        for (int i = 1 ; i <= n ; ++i)
        {
            // if (a[i] > 0)
            // {
            //     std::cout << -1 << '\n';
            // }

            assert(a[i] == 0);
        }
    }

    // std::cerr << "at the end\n";
    // for (int i = 1 ; i <= n ; ++i)
    // {
    //     std::cerr << a[i] << ' ';
    // }

    // std::cerr << '\n';
}

void input()
{
    std::cin >> n >> k;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> a[i];
    }
}

void print()
{
    std::cout << ops.size() << '\n';
    for (const auto &[x, y] : ops)
    {
        assert(x == 1 || x == 2);
        assert(1 <= y && y <= n);
        std::cout << x << ' ' << y << '\n';
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();
    print();

    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 15 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 55