diff --git a/题目3.cpp b/题目3.cpp
new file mode 100644
index 0000000..0a26ad5
--- /dev/null
+++ b/题目3.cpp
@@ -0,0 +1,136 @@
+#include<stdio.h>
+int board[9][9] = {{5, 3, 0, 0, 9, 0, 0, 0, 0},
+{6, 0, 0, 1, 7, 5, 0, 0, 0},
+{0, 9, 8, 0, 0, 0, 0, 6, 0},
+{8, 0, 0, 0, 6, 0, 0, 0, 3},
+{4, 0, 0, 8, 0, 3, 0, 0, 0},
+{7, 0, 0, 0, 2, 0, 0, 0, 6},
+{0, 6, 0, 0, 0, 0, 2, 8, 0},
+{0, 0, 0, 4, 1, 9, 0, 2, 5},
+{0, 0, 0, 0, 8, 0, 0, 7, 9}};
+
+//ÓÐʲô·½·¨¿ÉÒÔ×öµ½ÊäÈë¶àάÊý×éµÄÒ»Ðе½¶¨ÒåµÄº¯ÊýÀïÃæ 
+int main(void)
+{
+    printf("The original Sudoku matrix:\n");
+    for(int i=0;i<9;i++)
+	{
+		if(i%3==0)printf(" |----------------------|\n");
+		for(int j=0;j<9;j++)
+		{
+			if(j%3==0)printf(" |");
+			if(board[i][j]==0) printf(" .");
+			else printf(" %d",board[i][j]);
+		}
+		putchar('|');
+		putchar('\n');
+	}
+	printf(" |----------------------|\n");
+    
+    //ÅжÏÐÐ 
+    int count1=0;
+    int storage1;
+    int judge1=0;
+    for(int i=0;i<9;i++)
+    {
+    	for(int n=1;n<10;n++)
+    	{
+    		for(int j=0;j<9;j++)
+    		{
+    			if(board[i][j]==n)count1++;
+    			if(count1>1)
+    			{
+    				judge1=1;
+    				storage1=n;
+    			    break;
+				}
+			}
+			count1=0;
+			//ÅÐ¶Ï 
+			if(judge1)
+			{
+				printf("False:Invalid initial Sudoku matrix\n");
+				printf("The number %d in the col %d has been used!\n",storage1,i+1);
+				break;
+			}
+			
+		}
+		if(judge1)break;
+	}
+	
+	//ÅжÏÁÐ 
+	int count2=0;
+    int storage2;
+    int judge2=0;
+    for(int i=0;i<9;i++)
+    {
+    	for(int n=1;n<10;n++)
+    	{
+    		for(int j=0;j<9;j++)
+    		{
+    			if(board[j][i]==n)count2++;
+    			if(count2>1)
+    			{
+    				judge2=1;
+    				storage2=n;
+    			    break;
+				}
+			}
+			count2=0;
+			//ÅÐ¶Ï 
+			if(judge2)
+			{
+				printf("False:Invalid initial Sudoku matrix\n");
+				printf("The number %d in the list %d has been used!\n",storage2,i+1);
+				break;
+			}
+			
+		}
+		if(judge2)break;
+	}
+
+	//ÅжÏÇø¿é
+	int count3=0;
+    int storage3;
+    int judge3=0;
+    for(int col=0;col<3;col++)
+    {
+    	for(int list=0;list<3;list++)
+    	{
+    		for(int n=1;n<10;n++)
+    		{
+    			for(int i=3*col;i<3*col+3;i++)
+    			{
+    				for(int j=3*list;j<3*list+3;j++)
+    				{
+    					if(board[i][j]==n)count3++;
+    					if(count3>1)
+    					{
+    						judge3=1;
+    						storage3=n;
+    						break;
+						}
+					}
+					if(judge3)break;
+				}
+				count3=0;
+			}
+			//ÅÐ¶Ï 
+			if(judge3)
+			{
+				printf("False:Invalid initial Sudoku matrix\n");
+				if(col==0)
+				printf("The number %d in the block %d has been used!\n",storage3,1+list);
+				else if(col==1)
+				printf("The number %d in the block %d has been used!\n",storage3,4+list);
+				else
+				printf("The number %d in the block %d has been used!\n",storage3,7+list);
+				break;
+			}
+			if(judge3)break;
+		}
+		if(judge3)break;
+	}
+    if(!judge1&&!judge2&&!judge3)printf("True:Valid initial Sudoku matrix!\n");
+    return 0;
+}