vector<string> split_string(string input_string) {
    // Potential issues with empty strings:
    while (input_string[input_string.length() - 1] == ' ') { // CRASH: access [-1] if empty
        input_string.pop_back();
    }
    // ... rest of splitting logic
}

int main() {
    // No validation before processing:
    vector<string> bnm = split_string(bnm_temp); // Could crash if bnm_temp empty
    int b = stoi(bnm[0]); // Could crash if bnm empty
    int n = stoi(bnm[1]); // Could crash if bnm size < 2
    int m = stoi(bnm[2]); // Could crash if bnm size < 3
    
    // Similar issues with keyboards_temp_temp and drives_temp_temp
    for (int keyboards_itr = 0; keyboards_itr < n; keyboards_itr++) {
        int keyboards_item = stoi(keyboards_temp[keyboards_itr]); // Could crash
        keyboards[keyboards_itr] = keyboards_item;
    }
}