提出 d42ab104-8e8a-4379-8b3c-4ef8d1f3fe3b

コード

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
using namespace std;
using ll = long long;

mutable mt19937 rng;

struct Op
{
    int id, H, W, a, b;
    bool operator<(const Op& rhs) const
    {
        return (H * W >= rhs.H * rhs.W) != (rng() % 20 == 0);
    }
};

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, T;
    if (!(cin >> N >> T))
        return 0;
    vector<vector<int>> A(N, vector<int>(N)), B(N, vector<int>(N));
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < N; ++j)
            cin >> A[i][j];
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < N; ++j)
            cin >> B[i][j];
    vector<Op> ops(T);
    for (int t = 0; t < T; ++t)
    {
        ops[t].id = t;
        cin >> ops[t].H >> ops[t].W >> ops[t].a >> ops[t].b;
    }
    const int LIMIT = 100000;
    vector<tuple<int, int, int>> out;
    out.reserve(10000);
    clock_t clk = clock();
    vector<char> used(T, 0);
    rng = mt19937(chrono::steady_clock::now().time_since_epoch().count());

    while ((double)(clock() - clk) / CLOCKS_PER_SEC < 2.9)
    {
        sort(ops.begin(), ops.end());
        for (int t = 0; t < T; ++t)
        {
            int id = ops[t].id, H = ops[t].H, W = ops[t].W, a = ops[t].a, b = ops[t].b;
            int uses = 0;
            while (used[id] < 3 && (int)out.size() < LIMIT)
            {
                vector<vector<int>> pref(N + 1, vector<int>(N + 1, 0));
                bool anyPossible = false;
                for (int i = 0; i < N; ++i)
                {
                    int rowSum = 0;
                    for (int j = 0; j < N; ++j)
                    {
                        int w = 0;
                        if (A[i][j] == a)
                        {
                            int before = (int)A[i][j] - (int)B[i][j];
                            int after = (int)b - (int)B[i][j];
                            w = after * after - before * before;
                            anyPossible = true;
                        }
                        rowSum += w;
                        pref[i + 1][j + 1] = pref[i][j + 1] + rowSum;
                    }
                }
                if (!anyPossible)
                    break;
                int bestDelta = 0;
                int bestX = -1, bestY = -1;
                for (int x = 0; x + H <= N; ++x)
                {
                    for (int y = 0; y + W <= N; ++y)
                    {
                        int x2 = x + H, y2 = y + W;
                        int s = pref[x2][y2] - pref[x][y2] - pref[x2][y] + pref[x][y];
                        if (s < bestDelta)
                        {
                            bestDelta = s;
                            bestX = x;
                            bestY = y;
                        }
                    }
                }
                if (bestX == -1)
                    break;
                for (int i = bestX; i < bestX + H; ++i)
                {
                    for (int j = bestY; j < bestY + W; ++j)
                    {
                        if (A[i][j] == a)
                            A[i][j] = b;
                    }
                }
                out.emplace_back(id, bestX, bestY);
                ++used[id];
            }
            if ((int)out.size() >= LIMIT)
                break;
        }
    }

    cout << out.size() << '\n';
    for (auto &tp : out)
    {
        int id, x, y;
        tie(id, x, y) = tp;
        cout << id << " " << x << " " << y << "\n";
    }
    return 0;
}
結果

問題	点数	言語	結果	実行時間	メモリ
A. Replace() は Replace() されました	0	C++ (gcc)	IE	0 ms	0 KiB