问C++性能:检查内存块在特定单元中是否有特定值

EN

char* bin;
bin = new (nothrow) char[area];
if (bin == 0) {
    cout << "Error: " << area << " bytes could not be allocated";
    return false;
}
for (int i=0; i<area; i++) {
    bin[i]='o';
}

void place(char* bin, int* best, int width)
{   
    for (int i=best[0]; i<best[0]+best[1]; i++)
        for (int j=best[2]; j<best[2]+best[3]; j++)
            bin[i*width+j] = 'x';
}

bool fits(char* bin, int* pos, int width)
{   
    for (int i=pos[0]; i<pos[0]+pos[1]; i++)
        for (int j=pos[2]; j<pos[2]+pos[3]; j++)
            if (bin[i*width+j] == 'x')
                return false;
    return true;
}