hdu 1081: to the max

#include <stdlib.h>
#include <string.h>
#define max(a,b) (a)>(b)?(a):(b)
int ()
{
    
    int N;
    int Matrix[100][100];
    int mSum[100];
    int i,j,k,p;
    int MaxSum,Max,sum;
    while ( scanf("%d",&N)!=EOF )
    {
        for ( i = 0; i < N; i++)
            for ( j = 0; j < N; j++)
                scanf("%d",&Matrix[i][j]);
        Max = 0;
        for ( k = 1; k < N; k++)
        {
            for ( i = 0; i + k < N;i++)
            {
                memset(mSum,0,sizeof(mSum));
                for ( j = 0; j <= k; j++)
                {
                    for ( p = 0; p < N;p++)
                        mSum[p] += Matrix[i+j][p];
                }
                MaxSum = 0,sum = 0;
                for ( p = 0; p < N; p++)
                {
                    sum += mSum[p];
                    sum = max(sum,mSum[p]);
                    MaxSum = max(MaxSum,sum);
                }
                if (MaxSum > Max)
                    Max = MaxSum;
            }
        }
        printf("%dn",Max);
    }
    return 0;
}