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# include <stdio.h>
# include <time.h>
# include <stdlib.h>
//任务二：
int main ( )
{
srand ( time ( NULL ) ) ;
//Step1:创造一个9*9的零矩阵
int m [ 9 ] [ 9 ] = { 0 } ;
//Step2:我们对矩阵的1-3,4-6,7-9行处理
//我们定义一个数组a[3][9]={1,2,...,9;0,0,0...,0} ， ，
int a [ 3 ] [ 9 ] = { 0 } ;
for ( int i = 0 ; i < 9 ; i + + )
{
a [ 0 ] [ i ] = i + 1 ;
}
int judge = 1 ; //judge表示分三批处理的批次
while ( judge < = 3 )
{
//Step2-1：
for ( int i = 0 ; i < 9 ; i + + )
{
a [ 1 ] [ i ] = rand ( ) % 3 + 1 ; //生成一个 1-3的随机数
if ( i > = 3 ) //检查是否一行里面超过了3个数
{
int times [ 3 ] = { 0 } ; //times[1]即指2在前i个数中出现的次数
for ( int j = 0 ; j < = i ; j + + )
{
times [ a [ 1 ] [ j ] - 1 ] + + ;
}
if ( times [ 0 ] > 3 | | times [ 1 ] > 3 | | times [ 2 ] > 3 )
{
i = i - 1 ; //一行里面超过了3个数， ， ；
}
}
}
//Step2-2：
for ( int i = 0 ; i < 9 ; i + + )
{
a [ 2 ] [ i ] = rand ( ) % 9 + 1 ; //生成1-9的随机数
if ( i > 0 )
{
//检查是否对于在同一行的数，其列数重复
m [ a [ 1 ] [ i - 1 ] - 1 + 3 * ( judge - 1 ) ] [ a [ 2 ] [ i - 1 ] - 1 ] = i ; //把数i填入最初创建的矩阵m
if ( m [ a [ 1 ] [ i ] - 1 + 3 * ( judge - 1 ) ] [ a [ 2 ] [ i ] - 1 ] ! = 0 ) //如果不为0，
{
i = i - 1 ; //则对于数i+1， ；
}
}
}
m [ a [ 1 ] [ 8 ] - 1 + 3 * ( judge - 1 ) ] [ a [ 2 ] [ 8 ] - 1 ] = 9 ;
judge + + ;
}
//Step3:输出随机数组
for ( int i = 0 ; i < 9 ; i + + )
{
printf ( " | " ) ; //每一行的以|开始
for ( int j = 0 ; j < 9 ; j + + )
{
printf ( " %d " , m [ i ] [ j ] ) ;
if ( ( j + 1 ) % 3 = = 0 )
{
printf ( " | " ) ; //区分3*3
if ( j = = 8 )
{
printf ( " \n " ) ;
}
}
}
if ( ( i + 1 ) % 3 = = 0 & & i ! = 8 )
{
printf ( " |----分割---| \n " ) ;
} //每三行就换一行
}
}
