一道简单题。

火车停的位置不是在整点就是在二分之一点，坐标*2，然后枚举火车停的位置，计算总距离即可。

 

 

code：

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #define INF 309using namespace std;int L, m, n, x, ans, p;int pg[INF], train[INF];int main() {	cin >> L >> m;	for (int i = 1; i <= m; i++) cin >> x, pg[i] = x << 1;	cin >> n;	for (int i = 2; i <= n; i++) cin >> x, train[i] = x << 1;	L <<= 1;	for (int s = 0; train[n] <= L;) {		int tem = 0;		for (int i = 1; i <= m; i++) {			int t = lower_bound (train + 1, train + 1 + n, pg[i]) - train;			if(t!=1)tem += min (abs (train[t]-pg[i]), abs (train[t - 1] - pg[i]) );			else                            tem+=abs(train[t]-pg[i]);		}		if (ans < tem)			ans = tem, p = s;		for (int i = n; i >= 1; i--)			train[i]++;		s++;	}	cout<