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Link: http://codepad.org/YkrT72kR    [ raw code | output | fork ]

C++, pasted on Aug 15:
#include <iostream>
#include <inttypes.h>

const uint8_t HEIGHT = 20;
const uint8_t WIDTH = 20;
const uint8_t CONSECUTIVE = 4;
const int GRID[HEIGHT][WIDTH] =
    {{8, 02, 22, 97, 38, 15, 00, 40, 00, 75, 04, 05, 07, 78, 52, 12, 50, 77, 91, 8},
    {49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 04, 56, 62, 00},
    {81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 03, 49, 13, 36, 65},
    {52, 70, 95, 23, 04, 60, 11, 42, 69, 24, 68, 56, 01, 32, 56, 71, 37, 02, 36, 91},
    {22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80},
    {24, 47, 32, 60, 99, 03, 45, 02, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50},
    {32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70},
    {67, 26, 20, 68, 02, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21},
    {24, 55, 58, 05, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72},
    {21, 36, 23, 9, 75, 00, 76, 44, 20, 45, 35, 14, 00, 61, 33, 97, 34, 31, 33, 95},
    {78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 03, 80, 04, 62, 16, 14, 9, 53, 56, 92},
    {16, 39, 05, 42, 96, 35, 31, 47, 55, 58, 88, 24, 00, 17, 54, 24, 36, 29, 85, 57},
    {86, 56, 00, 48, 35, 71, 89, 07, 05, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58},
    {19, 80, 81, 68, 05, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 04, 89, 55, 40},
    {04, 52, 8, 83, 97, 35, 99, 16, 07, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66},
    {88, 36, 68, 87, 57, 62, 20, 72, 03, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69},
    {04, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36},
    {20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 04, 36, 16},
    {20, 73, 35, 29, 78, 31, 90, 01, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 05, 54},
    {01, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 01, 89, 19, 67, 48}};

int main()
{
    uint64_t max = 0, temp_max = 0;
    uint16_t max_x=0, max_y=0;
    std::string direction = "";
    for (uint8_t i=0; i<HEIGHT; i++)
    {
        for (uint8_t j=0; j<WIDTH; j++)
        {
            // Can we check right?
            if (j < (WIDTH - CONSECUTIVE))
            {
                temp_max=0;
                for (int k=0; k<CONSECUTIVE; k++)
                {
                    temp_max += GRID[i][j+k];
                }
                if (temp_max > max)
                {
                    max = temp_max;
                    max_x = j;
                    max_y = i;
                    direction = "right";
                }
            }

            // Can we check down?
            if (i < (WIDTH - CONSECUTIVE))
            {
                temp_max=0;
                for (int k=0; k<CONSECUTIVE; k++)
                {
                    temp_max += GRID[i+k][j];
                }
                if (temp_max > max)
                {
                    max = temp_max;
                    max_x = j;
                    max_y = i;
                    direction = "down";
                }
            }

            // Can we check down-right?
            if ((i < (HEIGHT - CONSECUTIVE)) && (j < (WIDTH - CONSECUTIVE)))
            {
                temp_max=0;
                for (int k=0; k<CONSECUTIVE; k++)
                {
                    temp_max += GRID[i+k][j+k];
                }
                if (temp_max > max)
                {
                    direction = "diagonal down right";
                    max = temp_max;
                    max_x = j;
                    max_y = i;
                }
            }

            // Can we check down-left?
            if ((i > (CONSECUTIVE)) && (j < (WIDTH - CONSECUTIVE)))
            {
                temp_max=0;
                for (int k=0; k<CONSECUTIVE; k++)
                {
                    temp_max += GRID[i-k][j+k];
                }
                if (temp_max > max)
                {
                    direction = "diagonal down left";
                    max = temp_max;
                    max_x = j;
                    max_y = i;
                }
            }

        }
    }
    std::cout << "Max product was " << max << " at (" << max_x << "," << max_y << ") in direction " << direction << std::endl;
    return 0;
}


Output:
1
Max product was 367 at (3,15) in direction diagonal down left


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