View Compilation Error

0_0_27292020_676.cpp: In function 'void push_up(int)':
0_0_27292020_676.cpp:101:5: error: 'a' was not declared in this scope
     a[k].minn=min(a[k*2].minn,a[k*2+1].minn);
     ^
0_0_27292020_676.cpp: In function 'void build(int, int, int)':
0_0_27292020_676.cpp:107:5: error: 'a' was not declared in this scope
     a[k].l=l;
     ^
0_0_27292020_676.cpp: In function 'll query(int, int, int, ll, ll)':
0_0_27292020_676.cpp:123:20: error: 'struct node' has no member named 'mn'
         if(tree[i].mn>b || tree[i].mx<a){
                    ^
0_0_27292020_676.cpp:123:36: error: 'struct node' has no member named 'mx'
         if(tree[i].mn>b || tree[i].mx<a){
                                    ^
0_0_27292020_676.cpp:126:20: error: 'struct node' has no member named 'mn'
         if(tree[i].mn>=a && tree[i].mx<=b){
                    ^
0_0_27292020_676.cpp:126:37: error: 'struct node' has no member named 'mx'
         if(tree[i].mn>=a && tree[i].mx<=b){
                                     ^