View Compilation Error

0_0_21441714_30645.cpp: In function 'void erase(int)':
0_0_21441714_30645.cpp:16:15: error: 'n' was not declared in this scope
     if(np[x]<=n)
               ^
0_0_21441714_30645.cpp: In function 'int main()':
0_0_21441714_30645.cpp:40:23: error: 'num' was not declared in this scope
             int p=pos[num];
                       ^
0_0_21441714_30645.cpp:45:19: error: invalid types 'int[int]' for array subscript
             t[++t0]=d;
                   ^
0_0_21441714_30645.cpp:47:19: error: invalid types 'int[int]' for array subscript
             t[++t0]=n+1;
                   ^
0_0_21441714_30645.cpp:51:32: error: invalid types 'int[int]' for array subscript
                 ans+=(t[k+1-i+1]-t[k+1-i])*1LL*(s[i]-s[i+1])*num;
                                ^
0_0_21441714_30645.cpp:51:41: error: invalid types 'int[int]' for array subscript
                 ans+=(t[k+1-i+1]-t[k+1-i])*1LL*(s[i]-s[i+1])*num;
                                         ^