View Compilation Error

0_0_29098505_13903.cpp: In function 'void del(int)':
0_0_29098505_13903.cpp:32:9: error: 'cur' was not declared in this scope
         cur-=num[k-a[pos]];
         ^
0_0_29098505_13903.cpp:32:22: error: 'pos' was not declared in this scope
         cur-=num[k-a[pos]];
                      ^
0_0_29098505_13903.cpp: In function 'int main()':
0_0_29098505_13903.cpp:78:26: error: 'struct node' has no member named 'ans'
    printf("%d\n", G[i*4].ans-G[i*4+1].ans-G[i*4+2].ans+G[i*4+3].ans);
                          ^
0_0_29098505_13903.cpp:78:39: error: 'struct node' has no member named 'ans'
    printf("%d\n", G[i*4].ans-G[i*4+1].ans-G[i*4+2].ans+G[i*4+3].ans);
                                       ^
0_0_29098505_13903.cpp:78:52: error: 'struct node' has no member named 'ans'
    printf("%d\n", G[i*4].ans-G[i*4+1].ans-G[i*4+2].ans+G[i*4+3].ans);
                                                    ^
0_0_29098505_13903.cpp:78:65: error: 'struct node' has no member named 'ans'
    printf("%d\n", G[i*4].ans-G[i*4+1].ans-G[i*4+2].ans+G[i*4+3].ans);
                                                                 ^