Array name error, although there doesn't seem to be an error, what's the problem?

Question

C++ / C#

#include <iostream>
int main(int argc, const char * argv[]) {
    int nach, kol,kol2,i,k,b,c=0;
    std::cin>>nach>>kol>>kol2;
    while (nach!=0) {
        for (i=0; i<kol; i++) {
            int monstersA[kol];
            std::cin>>monstersA[i];
        }
        for (k=0; k<kol2; k++) {
            int monstersB[kol2];
            std::cin>>monstersB[k];
        }
        for (b=0; b<kol*kol2; b++) {
            if (monstersA[b] > monstersB[b]) {
            
            }
        }
    }
}

Answer 1

Must. Move the monsters array declarations out of the for loops.
And read up on scopes. Right now, google "c++ scope" and get enlightened.