diff --git a/main_3.c b/main_3.c
new file mode 100644
index 0000000..c2ba146
--- /dev/null
+++ b/main_3.c
@@ -0,0 +1,115 @@
+#include <stdio.h>
+
+
+int board0[9][9] = {{5, 3, 0, 0, 7, 0, 0, 0, 0},
+                    {6, 0, 0, 1, 9, 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, 1},
+                    {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, 0, 5},
+                    {0, 0, 0, 0, 8, 0, 0, 7, 9}};
+
+int board1[9][9] = {{8, 3, 0, 0, 7, 0, 0, 0, 0},
+                    {6, 0, 0, 1, 9, 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, 1},
+                    {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, 0, 5},
+                    {0, 0, 0, 0, 8, 0, 0, 7, 9}};
+int err_group=0,err_num=0;
+
+int check_submatrix(int * ptr){
+    int bottle[9]={0};
+    int * cur_ptr=ptr;
+    for(int i=0;i<3;i++){
+        for(int j=0;j<3;j++){
+            bottle[*(cur_ptr+j)]++;
+            //printf("%d ",*(cur_ptr+j));
+        }
+        //printf("\n");
+        cur_ptr+=9;
+    }
+    for(int i=1;i<=8;i++){
+        //printf("%d",bottle[i]);
+        if(bottle[i]>1){
+            err_num = i;
+            return 0;
+        }
+    }
+    return 1;
+}
+
+int check_col(int * ptr){
+    int bottle[9]={0};
+    int * cur_ptr=ptr;
+    for(int i=0;i<9;i++){
+        bottle[* cur_ptr]++;
+        //printf("%d \n",* cur_ptr);
+        cur_ptr+=9;
+    }
+    for(int i=1;i<=8;i++){
+        //printf("%d",bottle[i]);
+        if(bottle[i]>1){
+            err_num = i;
+            return 0;
+        }
+    }
+    return 1;
+}
+
+int check_row(int * ptr){
+    int bottle[9]={0};
+    int * cur_ptr=ptr;
+    for(int i=0;i<9;i++){
+        bottle[* cur_ptr]++;
+        //printf("%d ",* cur_ptr);
+        cur_ptr++;
+    }
+    for(int i=1;i<=8;i++){
+        //printf("%d",bottle[i]);
+        if(bottle[i]>1){
+            err_num = i;
+            return 0;
+        }
+    }
+    return 1;
+}
+
+int check_whole(int * ptr){
+    for(int i=0;i<9;i+=3){
+        for(int j=0;j<9;j+=3){
+            if(!check_submatrix(&ptr[i*9+j])){
+                printf("False:Invalid initial Sudoku matrix!\n");
+                printf("The number %d in the block %d has been used!",err_num,i+j/3+1);
+                return 0;
+            }
+        }
+    }
+
+    for(int i=0;i<9;i++){
+        if(!check_row(&ptr[i*9+0])){
+            printf("False:Invalid initial Sudoku matrix!\n");
+            printf("The number %d in the col %d has been used!",err_num,i);
+            return 0;
+        }
+    }
+
+    for(int i=0;i<9;i++){
+        if(!check_col(&ptr[i])){
+            printf("False:Invalid initial Sudoku matrix!\n");
+            printf("The number %d in the row %d has been used!",err_num,i);
+            return 0;
+        }
+    }
+
+    printf("True:Valid initial Sudoku matrix!");
+}
+int main(void) {
+
+    check_whole(&board1[0][0]);
+    return 0;
+}