11.c

/*************************************************************************
	> File Name: 11.c
	> Author: qusijun
	> Mail: wiilen.lian@gamil.com 
	> Created Time: 2014年05月13日 星期二 20时42分02秒
 ************************************************************************/


#include<stdio.h>


int arr[20][20] = {{8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5,7, 78, 52, 12, 50, 77, 91, 8},\
                   {49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4 , 56, 62 ,0},\
                   {81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3 , 49, 13, 36, 65},\
                   {52, 70, 95, 23, 4 , 60, 11, 42, 69, 24, 68, 56, 1 , 32, 56, 71, 37, 2 , 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, 3 , 45, 2 , 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, 2 , 62, 12, 20, 95, 63, 94, 39, 63, 8 , 40, 91, 66, 49, 94, 21},\
                   {24, 55, 58, 5 , 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72},\
                   {21, 36, 23, 9 , 75, 0 , 76, 44, 20, 45, 35, 14, 0 , 61, 33, 97, 34, 31, 33, 95},\
                   {78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3 , 80, 4 , 62, 16, 14, 9 , 53, 56, 92},\
                   {16, 39, 5 , 42, 96, 35, 31, 47, 55, 58, 88, 24, 0 , 17, 54, 24, 36, 29, 85, 57},\
                   {86, 56, 0 , 48, 35, 71, 89, 7 , 5 , 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58},\
                   {19, 80, 81, 68, 5 , 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4 , 89, 55, 40},\
                   {4 , 52, 8 , 83, 97, 35, 99, 16, 7 , 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66},\
                   {88, 36, 68, 87, 57, 62, 20, 72, 3 , 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69},\
                   {4 , 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, 4 , 36, 16},\
                   {20, 73, 35, 29, 78, 31, 90, 1 , 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5 , 54},\
                   {1 , 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1 , 89, 19, 67, 48}\
                  }; 

int max2(int a,int b)
{
    return (a>b)?a:b;
}

int max4(int a,int b,int c,int d)
{
    return max2(max2(a,b),max2(c,d));
}
int main(void)
{
    int sum1 = 0;
    int sum2 = 0;
    for(int i = 0;i<17;i++)
    {
        for(int j = 0;j<17;j++)
        {
            int x = arr[i][j]*arr[i][j+1]*arr[i][j+2]*arr[i][j+3];
            int y = arr[i][j]*arr[i+1][j]*arr[i+2][j]*arr[i+3][j];
            int z = arr[i][j]*arr[i+1][j+1]*arr[i+2][i+2]*arr[i+3][j+3];
            sum1 = max4(sum1,x,y,z);
        }
    }

    for(int i=0;i<17;i++)
    {
        for(int j =3;j<20;j++)
        {
            int x = arr[i][j]*arr[i+1][j-1]*arr[i+2][j-2]*arr[i+3][j-3];
            sum2 = max2(sum2,x);
        }
    }
    printf("%d\n",sum2);
    int sum = max2(sum1,sum2);


    printf("%d",sum);
    return 0;
}