Hero
Time Limit: 6000/3000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 2606 Accepted Submission(s): 1169
Problem Description
When
playing DotA with god-like rivals and pig-like team members, you have
to face an embarrassing situation: All your teammates are killed, and
you have to fight 1vN.
There are two key attributes for the
heroes in the game, health point (HP) and damage per shot (DPS). Your
hero has almost infinite HP, but only 1 DPS.
To simplify the
problem, we assume the game is turn-based, but not real-time. In each
round, you can choose one enemy hero to attack, and his HP will decrease
by 1. While at the same time, all the lived enemy heroes will attack
you, and your HP will decrease by the sum of their DPS. If one hero‘s HP
fall equal to (or below) zero, he will die after this round, and cannot
attack you in the following rounds.
Although your hero is undefeated, you want to choose best strategy to kill all the enemy heroes with minimum HP loss.
Input
The
first line of each test case contains the number of enemy heroes N (1
<= N <= 20). Then N lines followed, each contains two integers
DPSi and HPi, which are the DPS and HP for each hero. (1 <= DPSi, HPi
<= 1000)
Output
Output one line for each test, indicates the minimum HP loss.
Sample Input
1
10 2
2
100 1
1 100
Sample Output
20
201
Author
TJU
Source
2012 Multi-University Training Contest 2
代码：先是模拟，然后优化，之后得到这么一个jiahuo ....
1 #include<cstring>
2 #include<cstdio>
3 #include<algorithm>
4 using namespace std;
5 struct node{
6 int HP,DSP;
7 bool operator < (const node & a)const{
8 return DSP*a.HP>a.DSP*HP;
9 }
10 };
11 node st[22];
12 int main(){
13
14 int n;
15 int ans;
16 // freopen("test.in","r",stdin);
17 while(scanf("%d",&n)!=EOF){
18 ans=0;
19 for(int i=0;i<n;i++){
20 scanf("%d%d",&st[i].HP,&st[i].DSP);
21 }
22 sort(st,st+n);
23 for(int i=0;i<n;i++){
24 for(int j=i;j<n;j++){
25 ans+=st[j].DSP*st[i].HP;
26 }
27 }
28 printf("%d\n",ans);
29 }
30 return 0;
31 }