diff --git a/第二题.c b/第二题.c
new file mode 100644
index 0000000..a05bdb6
--- /dev/null
+++ b/第二题.c
@@ -0,0 +1,111 @@
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+int i,n,j,k,m; 
+int b[11];
+int main()
+{
+	srand(time(NULL));
+	int a[9][9]={{5,3,4,6,7,8,9,1,2},
+	{6,7,2,1,9,5,3,4,8},
+	{1,9,8,3,4,2,5,6,7},
+	{8,5,9,7,6,1,4,2,3},
+	{4,2,6,8,5,3,7,9,1},
+	{7,1,3,9,2,4,8,5,6},
+	{9,6,1,5,3,7,2,8,4},
+	{2,8,7,4,1,9,6,3,5},
+	{3,4,5,2,8,6,1,7,9}};
+	for(i=0;i<3;i++)
+	{
+		j=0;
+		while(j<3)
+		{
+			m=rand()%10;
+			if(m==0||b[m]==1)
+			continue;
+			int w=0;
+			for(w=0;w<9;w++)
+			{
+				if(a[i][w]==m)
+				{
+					a[i][w]=-a[i][w];
+					j++;
+					b[m]=1;
+					break;
+				}
+			}	
+		}
+	}
+	for(i=0;i<=10;i++)
+	b[i]=0;
+	for(i=3;i<6;i++)
+	{
+		j=0;
+		while(j<3)
+		{
+			m=rand()%10;
+			if(m==0||b[m]==1)
+			continue;
+			int w=0;
+			for(w=0;w<9;w++)
+			{
+				if(a[i][w]==m)
+				{
+					a[i][w]=-a[i][w];
+					j++;
+					b[m]=1;
+					break;
+				}
+			}	
+		}
+	}
+	for(i=0;i<=10;i++)
+	b[i]=0;
+	for(i=6;i<9;i++)
+	{
+		j=0;
+		while(j<3)
+		{
+			m=rand()%10;
+			if(m==0||b[m]==1)
+			continue;
+			int w=0;
+			for(w=0;w<9;w++)
+			{
+				if(a[i][w]==m)
+				{
+					a[i][w]=-a[i][w];
+					j++;
+					b[m]=1;
+					break;
+				}
+			}	
+		}
+	}
+	for(i=0;i<9;i++)
+	{
+		printf("|");
+		if(i==0||i==3||i==6)
+		{
+			for(k=0;k<23;k++)
+			printf("-");
+			printf("|\n|");
+		}
+		printf(" ");
+		for(j=0;j<9;j++)
+		{
+		
+			if(a[i][j]>0)
+			printf(". ");
+			else
+			printf("%d ",-a[i][j]);
+			if(j==2||j==5)
+			printf("| ");
+		}
+		printf("|\n");
+	}
+	printf("|");
+	for(k=0;k<23;k++)
+	printf("-");
+	printf("|\n");
+} 
\ No newline at end of file