Why do I get the "division by zero" error in this? https://codeforces.com/contest/1183/submission/56306470 I will be more than appreciated if you help me!
№ | Пользователь | Рейтинг |
---|---|---|
1 | tourist | 3690 |
2 | jiangly | 3647 |
3 | Benq | 3581 |
4 | orzdevinwang | 3570 |
5 | Geothermal | 3569 |
5 | cnnfls_csy | 3569 |
7 | Radewoosh | 3509 |
8 | ecnerwala | 3486 |
9 | jqdai0815 | 3474 |
10 | gyh20 | 3447 |
Страны | Города | Организации | Всё → |
№ | Пользователь | Вклад |
---|---|---|
1 | maomao90 | 174 |
2 | awoo | 164 |
3 | adamant | 163 |
4 | TheScrasse | 159 |
5 | nor | 157 |
6 | maroonrk | 155 |
7 | -is-this-fft- | 152 |
8 | Petr | 146 |
8 | orz | 146 |
10 | BledDest | 145 |
Why do I get the "division by zero" error in this? https://codeforces.com/contest/1183/submission/56306470 I will be more than appreciated if you help me!
Algorithm: reverse all the positives; if(product is negative) reverse the smallest one.
Proof:
With step1, we got the ABS of the product the greatest.
After step 1, we got the product:
1)positive: No step2. We are done.
2)negative: suppose the product after step 1 is (-1000)*(-2)*k(k<0) .Either we choose (-1000)*1*k, or 999*(-2)*k;
In general, a*(a+b)*k(b,k<0). 1st choice:(-a-1)*(a+b)*k; 2st choice a*(-a-b-1)*k. To make a comparision:((-a^2-a-ab-b)-(-a^2-ab-a))*k=-b*k<0, so we choose to reverse the smallest one.
Название |
---|