loj2292 「THUSC 2016」成绩单

ref

我是傻逼，我啥也不会，这是我抄的。

#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
int n, a, b, w[55], tot, dy[1005], g[55][55], f[55][55][55][55], va[55];
bool isAll(int i, int j, int l, int r){
    for(int k=i; k<=j; k++)
        if(w[k]<l || w[k]>r)
            return false;
    return true;
}
bool isAny(int i, int j, int l, int r){
    for(int k=i; k<=j; k++)
        if(w[k]>=l && w[k]<=r)
            return true;
    return false;
}
int F(int, int, int, int);
int G(int, int);
int F(int i, int j, int l, int r){
    int &re=f[i][j][l][r];
    if(re!=-1)  return re;
    re = 0x3f3f3f3f;
    if(isAll(i, j, l, r)){
        re = 0;
        return 0;
    }
    if(!isAny(i, j, l, r)){
        re = G(i, j);
        return re;
    }
    for(int k=i; k<j; k++){
        re = min(re, F(i,k,l,r)+F(k+1,j,l,r));
        re = min(re, G(i,k)+F(k+1,j,l,r));
    }
    return re;
}
int G(int l, int r){
    int &re=g[l][r];
    if(re!=-1)  return re;
    re = 0x3f3f3f3f;
    for(int i=1; i<=tot; i++)
        for(int j=i; j<=tot; j++)
            if(isAny(l, r, i, j)){
                int u=va[j], v=va[i];
                re = min(re, F(l, r, i, j) + a + b * (v - u) * (v - u));
            }
    return re;
}
int main(){
    cin>>n>>a>>b;
    for(int i=1; i<=n; i++){
        scanf("%d", &w[i]);
        dy[w[i]] = 1;
    }
    for(int i=1; i<=1000; i++)
        if(dy[i]){
            va[++tot] = i;
            dy[i] = tot;
        }
    for(int i=1; i<=n; i++)
        w[i] = dy[w[i]];
    memset(f, -1, sizeof(f));
    memset(g, -1, sizeof(g));
    cout<<G(1, n)<<endl;
    return 0;
}