View Compilation Error

0_0_14204572_19319.cpp: In function 'int main()':
0_0_14204572_19319.cpp:28:18: error: 'w' was not declared in this scope
    printf("%d\n",w[2]+w[1]/2+b[2]+b[1]/2);
                  ^
0_0_14204572_19319.cpp:28:30: error: 'b' was not declared in this scope
    printf("%d\n",w[2]+w[1]/2+b[2]+b[1]/2);
                              ^
0_0_14204572_19319.cpp:40:14: error: 'n1' was not declared in this scope
    for(int i=n1+n2+1;i<=n0+n1+n2;i++){
              ^
0_0_14204572_19319.cpp:40:17: error: 'n2' was not declared in this scope
    for(int i=n1+n2+1;i<=n0+n1+n2;i++){
                 ^
0_0_14204572_19319.cpp:40:25: error: 'n0' was not declared in this scope
    for(int i=n1+n2+1;i<=n0+n1+n2;i++){
                         ^