diff --git a/README.md b/README.md
index 1e41e98..ffe4e77 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,54 @@
 # matrix
-
+#include <iostream>
+#include <stdlib.h>
+#include <time.h>
+int main{
+    int board[9][9]={0};
+    srand(time(NULL));
+    void generate(int board[9][9]);
+    void format(int board[9][9]);
+    generate(board);
+    format(board);
+}
+    void random(int arr[9]){
+        for(int i=0;i<9;i++){
+            arr[i]=rand()%9+1;
+Re:
+            for(int j=0;j<i;j++){
+                while(arr[i]==arr[j]){
+                    arr[i]=rand()%9+1;
+                    goto Re;
+                }
+            }
+        }
+    }
+    void format(int board[9][9]){
+        for(int i=0;i<9;i++){
+            for(int j=0;j<9;j++){
+                printf("%d ",board[i][j]);
+                if((j+1)%3==0&&j!=8){
+                    printf("| ");
+                }                                
+            }
+            if((i+1)%3==0&&i!=8){
+                printf("\n---------------------\n");
+            }
+            else{printf("\n");}
+        }
+    }
+    void generate(int board[9][9]){
+        int rowplace[9]={0},rownum[9]={0};
+        for(int h=0;h<9;h+=3){
+            random(rownum);           
+            for(int i=h,k=-1;i<h+3;i++){                          
+                random(rowplace);
+                for(int j=0;j<9;j++){
+                    if(rowplace[j]<4){
+                        k++;
+                        board[i][j]=rownum[k];
+                    }
+                    else board[i][j]=0;
+                }
+            }
+        }
+    }
\ No newline at end of file