View Compilation Error

0_0_30382367_32048.cpp: In function 'void pushdown(int, int, int)':
0_0_30382367_32048.cpp:22:8: error: 'add' was not declared in this scope
     if(add[o]) {
        ^
0_0_30382367_32048.cpp: In function 'void build(int, int, int)':
0_0_30382367_32048.cpp:33:5: error: 'add' was not declared in this scope
     add[o] = 0;
     ^
0_0_30382367_32048.cpp: In function 'void update(int, int, int, int, int, int)':
0_0_30382367_32048.cpp:46:9: error: 'add' was not declared in this scope
         add[o] = c;
         ^