BZOJ 4244 邮戳拉力赛

题意：

思路：

参考博客

https://blog.csdn.net/forever_shi/article/details/84931438

 

 

 

/**************************************************************
    Problem: 4244
    User: fufck
    Language: C++
    Result: Accepted
    Time:8364 ms
    Memory:72076 kb
****************************************************************/
 
#include
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define dep(i,a,b) for(int i=b;i>=a;i--)
using namespace std;
#define ll long long
const int N=3e5+5;
const int mod = 998244353;
ll rd()
{
    ll x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
int n,T,u,v,d,e;
ll f[3010][3010];
int main()
{
    n=rd();T=rd();
    memset(f,0x3f,sizeof(f));
    f[0][0]=0;
    rep(i,1,n) 
    {
        u=rd(); v=rd();d=rd();e=rd(); 
        rep(j,1,n) f[i-1][j]+=2*T*j;
         
        rep(j,1,n) f[i][j]=min(f[i][j],f[i-1][j-1]+d+v);
        rep(j,0,n-1) f[i][j]=min(f[i][j],f[i-1][j+1]+e+u);
         
        rep(j,0,n) f[i][j]=min(f[i][j],f[i-1][j]+u+v);
        rep(j,1,n) f[i][j]=min(f[i][j],f[i-1][j]+d+e);
         
        rep(j,1,n) f[i][j]=min(f[i][j],f[i][j-1]+d+v);
        dep(j,0,n-1) f[i][j]=min(f[i][j],f[i][j+1]+u+e);
    }
    printf("%lld\n",f[n][0]+1ll*(n+1)*T); 
}