Submission #905859

#	Time	Username	Problem	Language	Result	Execution time	Memory
905859		vjudge1	Red-blue table (IZhO19_stones)	C++17	100 / 100	21 ms	5288 KiB

stones

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #include <x86intrin.h>

#include <bits/stdc++.h>
#include <chrono>
#include <random>

// @author: Vlapos

namespace operators
{
    template <typename T1, typename T2>
    std::istream &operator>>(std::istream &in, std::pair<T1, T2> &x)
    {
        in >> x.first >> x.second;
        return in;
    }

    template <typename T1, typename T2>
    std::ostream &operator<<(std::ostream &out, std::pair<T1, T2> x)
    {
        out << x.first << " " << x.second;
        return out;
    }

    template <typename T1>
    std::istream &operator>>(std::istream &in, std::vector<T1> &x)
    {
        for (auto &i : x)
            in >> i;
        return in;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::vector<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::set<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }
}

// name spaces
using namespace std;
using namespace operators;
// end of name spaces

// defines
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
#define uint unsigned int
#define all(vc) vc.begin(), vc.end()
// end of defines

// usefull stuff

void boost()
{
    ios_base ::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

inline int getbit(int &x, int &bt) { return (x >> bt) & 1; }

const int dx4[4] = {-1, 0, 0, 1};
const int dy4[4] = {0, -1, 1, 0};
const int dx8[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
const int dy8[8] = {-1, -0, 1, -1, 1, -1, 0, 1};

const ll INF = (1e18) + 500;
const int BIG = (1e9) * 2 + 100;
const int MAXN = (1e5) + 5;
const int MOD7 = (1e9) + 7;
const int MOD9 = (1e9) + 9;
const uint MODFFT = 998244353;

// #define int ll

struct test
{
    void solve(int testcase)
    {
        int n, m;
        cin >> n >> m;
        bool flag = 0;
        if (n < m)
        {
            swap(n, m);
            flag = 1;
        }
        int res = n;
        vector<vector<int>> ans(n, vector<int>(m, 1));

        int k = 0, bf = 0;
        for (int cnt = 0; cnt < (m - 1) / 2; ++cnt)
        {
            for (int i = 0; i < n; ++i)
            {
                ans[i][k] = 0;
                bf++;
                if (bf == n / 2 + 1)
                {
                    bf = 0;
                    k++;
                    res++;
                }
            }
        }
        cout << res << "\n";
        if (flag)
        {
            for (int i = 0; i < m; ++i, cout << "\n")
                for (int j = 0; j < n; ++j)
                    if (ans[j][i])
                        cout << "-";
                    else
                        cout << "+";
        }
        else
        {
            for (int i = 0; i < n; ++i, cout << "\n")
                for (int j = 0; j < m; ++j)
                    if (ans[i][j])
                        cout << "+";
                    else
                        cout << "-";
        }
    }
};

main()
{
    boost();
    int q = 1;
    cin >> q;
    for (int i = 0; i < q; i++)
    {
        test t;
        t.solve(i);
    }
    return 0;
}
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//
//                                                                                    //
//                               Coded by Der_Vlἀpos                                  //
//                                                                                    //
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//

Compilation message (stderr)

stones.cpp:147:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  147 | main()
      | ^~~~

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31