View Compilation Error

0_0_14231986_28644.cpp: In function 'void build(int, int, int)':
0_0_14231986_28644.cpp:61:27: error: 'read' was not declared in this scope
   if(l&1)read(a[o].w[1][1]);//scanf("%lld",&a[o].w[1][1]);
                           ^
0_0_14231986_28644.cpp:62:25: error: 'read' was not declared in this scope
   else read(a[o].w[0][0]);//scanf("%lld",&a[o].w[0][0]);
                         ^