HDU - 1052 Tian Ji -- The Horse Racing

题意:田忌赛马,赢得话有200,输了-200,平局不变,求他最多能得到多少

思路:如果他的目前最快的马能大于齐王的,那么就用这匹去比,显然这不会比拿比较慢的去比来的差,同样的道理适用在最慢的比较,如果最快的都比齐王最快的差的话,那么就降低损失,用最慢的去比

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int MAXN = 1010;

int arr[MAXN],brr[MAXN],n;

int main(){
    while (scanf("%d",&n) != EOF && n){
        for (int i = 0; i < n; i++)
            scanf("%d",&arr[i]);
        for (int j = 0; j < n; j++)
            scanf("%d",&brr[j]);
        sort(arr,arr+n);
        sort(brr,brr+n);
        int cnt1 = n-1,cnt2 = n-1;
        int sign1 = 0,sign2 = 0;
        int ans = 0;
        for (int i = 0; i < n; i++){
            if (arr[cnt1] > brr[cnt2]){
                ans += 200;
                cnt1--,cnt2--; 
            }
            else {
                if (arr[sign1] > brr[sign2]){
                    ans += 200;
                    sign1++,sign2++;
                }
                else if (arr[sign1] == brr[cnt2])
                    sign1++,cnt2--;
                else if (arr[sign1] < brr[cnt2]){
                    ans -= 200;
                    sign1++,cnt2--;
                }
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}



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