这道题题意很好理解，就是求出田忌最多能赢多少钱，赢一场比赛得200金币，输一场失去200金币，平局不得不失！
思路：所以很明显就能知道这道题可以使用贪心来做！能贪则贪———能赢就赢，不能赢就尽量保证不输，如果输已是必然的话，那么也要为之后的比赛做出贡献，在这场比赛中自己能输而无憾——即用自己现在最差的马和国王最强的马比赛，“同归于尽”！
代码中有详细的题解和思路，带着注释看，我想应该能有很好的理解吧！
代码如下：
#include<algorithm>
#include<stdio.h>
#include<string.h>
using namespace std;
int main()
{
int n,tian[5203],king[5204];
while(scanf("%d",&n)!=EOF&&n)
{
for(int i=0;i<n;i++)
scanf("%d",&tian[i]);
for(int i=0;i<n;i++)
scanf("%d",&king[i]);
sort(tian,tian+n);
sort(king,king+n);
int maxt=n-1;
int mint=0;
int maxk=n-1;
int mink=0;
int ans=0;
while(maxt>=mint)
{
//printf("ans=%d\n",ans);
if(tian[maxt]>king[maxk])
{//田忌的最强马匹完全能赢过king的最强马匹！
maxt--;
maxk--;
ans++;
}
else if(tian[mint]>king[mink])
{//田忌的最弱马匹完全能赢过king的最弱马匹！
mint++;
mink++;
ans++;
}
else
{//现在的情况是田忌最强和最弱马匹都不能赢..
//king的最强和最弱马匹！//所以需要以小换大的方法了！
if(tian[mint]<king[maxk])
ans--;//这种情况是必然要输一场的了！不然就是平局，ans就不会加加了！
mint++;
maxk--;
}
//printf("田忌maxt=%d;mint=%d\n",maxt,mint);
//printf("齐威maxk=%d;mink=%d\n",maxk,mink);
}
printf("%d\n",ans*200);
}
return 0;
}
Description
That was about 2300 years ago. General Tian Ji was a high official in the country Qi. He likes to play horse racing with the king and others.
Both of Tian and the king have three horses in different classes, namely, regular, plus, and super. The rule is to have three rounds in a match; each of the horses must be used in one round. The winner of a single round takes two hundred silver dollars from the loser.
Being the most powerful man in the country, the king has so nice horses that in each class his horse is better than Tian‘s. As a result, each time the king takes six hundred silver dollars from Tian.
Tian Ji was not happy about that, until he met Sun Bin, one of the most famous generals in Chinese history. Using a little trick due to Sun, Tian Ji brought home two hundred silver dollars and such a grace in the next match.
It was a rather simple trick. Using his regular class horse race against the super class from the king, they will certainly lose that round. But then his plus beat the king‘s regular, and his super beat the king‘s plus. What a simple trick. And how do you think of Tian Ji, the high ranked official in China?
Input
Output
Sample Input
3 92 83 71 95 87 74 2 20 20 20 20 2 20 19 22 18 0
Sample Output
200 0 0
poj-2287-Tian Ji -- The Horse Racing
原文地址：http://blog.csdn.net/u014004096/article/details/39023881
