View Compilation Error

0_0_13253845_21754.cpp: In function 'void insert(int, int)':
0_0_13253845_21754.cpp:23:13: error: 'maxn' was not declared in this scope
     while(x<maxn)
             ^
0_0_13253845_21754.cpp: In function 'int main()':
0_0_13253845_21754.cpp:46:16: error: 'bit' was not declared in this scope
         memset(bit,0,sizeof(bit));
                ^
0_0_13253845_21754.cpp:51:24: error: 'add' was not declared in this scope
             add(i,value);
                        ^