View Compilation Error

0_0_33395185_3328.cpp: In function 'int main()':
0_0_33395185_3328.cpp:69:24: error: 'n' was not declared in this scope
         scanf("%d%d", &n, &m);
                        ^
0_0_33395185_3328.cpp:69:28: error: 'm' was not declared in this scope
         scanf("%d%d", &n, &m);
                            ^
0_0_33395185_3328.cpp:77:36: error: 'mini_tree' was not declared in this scope
         int ans = mini_tree(1, n, m);
                                    ^