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;
}