NestedArrayHelper.cs

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// Copyright 2010-2021 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Google.OrTools
{

    using System;
    using System.Collections.Generic;

    public static class NestedArrayHelper
    {
        public static T[] GetFlatArray<T>(T[][] arr)
        {
            int flatLength = 0;
            for (var i = 0; i < arr.GetLength(0); i++)
                flatLength += arr[i].GetLength(0);

            int idx = 0;
            T[] flat = new T[flatLength];

            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr[i].GetLength(0); j++)
                    flat[idx++] = arr[i][j];
            }

            return flat;
        }

        public static T[] GetFlatArrayFromMatrix<T>(T[,] arr)
        {
            int flatLength = arr.GetLength(0) * arr.GetLength(1);

            int idx = 0;
            T[] flat = new T[flatLength];

            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                    flat[idx++] = arr[i, j];
            }

            return flat;
        }

        public static int[] GetArraySecondSize<T>(T[][] arr)
        {
            var result = new int[arr.GetLength(0)];
            for (var i = 0; i < arr.GetLength(0); i++)
            {
                if (arr[i] != null)
                    result[i] = arr[i].Length;
            }
            return result;
        }
    }
} // namespace Google.OrTools