#include<stdio.h>
#define N 8
void input(int n,int p[N][N])
{
int i,j;
for(i=0;i<n;i++)
{
printf("please input the %d line:\n",i+1);
for(j=0;j<n;j++)
{
scanf("%d",&p[i][j]);
}
}
}
void output(int n,int p[N][N])
{
int i,j;
for(i=0;i<n;i++)
{
printf("\n");
for(j=0;j<n;j++)
{
printf("%d",p[i][j]);
}
}
}
void MATRIX_ADD(int n,int X[][N],int Y[][N],int Z[][N])
{
int i,j;
for(i=0;i<n;i++)
for(j=0;j<n;j++)
Z[i][j]=X[i][j]+Y[i][j];
}
void MATRIX_SUB(int n,int X[][N],int Y[][N],int Z[][N])
{
int i,j;
for(i=0;i<n;i++)
for(j=0;j<n;j++)
Z[i][j]=X[i][j]-Y[i][j];
}
void MATRIX_MULTIPLY(int A[][N],int B[][N],int C[][N])
{
int i,j,t;
for(i=0;i<2;i++)
for(j=0;j<2;j++)
{
C[i][j]=0;
for(t=0;t<2;t++)
C[i][j]=C[i][j]+A[i][t]*B[t][j];
}
}
void STRASSEN(int n,int A[][N],int B[][N],int C[][N])
{
int i,j;
int A11[N][N],A12[N][N],A21[N][N],A22[N][N];
int B11[N][N],B12[N][N],B21[N][N],B22[N][N];
int C11[N][N],C12[N][N],C21[N][N],C22[N][N];
int M1[N][N],M2[N][N],M3[N][N],M4[N][N],M5[N][N],M6[N][N],M7[N][N];
int AA[N][N],BB[N][N],MM1[N][N],MM2[N][N];
if(n==2)
MATRIX_MULTIPLY(A,B,C);
else
{
for(i=0;i<n/2;i++)
for(j=0;j<n/2;j++)
{
A11[i][j]=A[i][j];
A12[i][j]=A[i][j+n/2];
A21[i][j]=A[i+n/2][j];
A22[i][j]=A[i+n/2][j+n/2];
B11[i][j]=B[i][j];
B12[i][j]=B[i][j+n/2];
B21[i][j]=B[i+n/2][j];
B22[i][j]=B[i+n/2][j+n/2];
}
MATRIX_SUB(n/2,B12,B22,BB);
STRASSEN(n/2,A11,BB,M1);
MATRIX_ADD(n/2,A11,A12,AA);
STRASSEN(n/2,AA,B22,M2);
MATRIX_ADD(n/2,A21,A22,
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