View Compilation Error

0_0_25930307_25605.cpp: In function 'int main()':
0_0_25930307_25605.cpp:29:5: error: 'b' was not declared in this scope
     b[x++]=v[i][j];
     ^
0_0_25930307_25605.cpp:29:18: error: invalid types 'int[int]' for array subscript
     b[x++]=v[i][j];
                  ^
0_0_25930307_25605.cpp:41:26: error: 'b' was not declared in this scope
     temp=v+x-upper_bound(b,b+t,k-a[i][j])-(a[i]+1+a[i][0]-upper_bound(a[i]+1,a[i]+1+a[i][0],k-a[i][j]));
                          ^