View Compilation Error

0_0_15925381_13133.cpp: In function 'int doubleGet_ANS(int)':
0_0_15925381_13133.cpp:39:38: error: 'Get_len' was not declared in this scope
            if(min > (d = Get_len(i, j))) min = d;
                                      ^
0_0_15925381_13133.cpp: In function 'int main()':
0_0_15925381_13133.cpp:52:35: error: 'Get_ANS' was not declared in this scope
        printf("%.6lf\n", Get_ANS(N));
                                   ^