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(区间dp)hdu 5115 Dire Wolf

作者:互联网

题目
hdu5115

题意:
有 n 头狼,打死一头狼,将受到与该狼当前攻击相同的伤害 + 当前相邻狼提供的额外攻击。并且该狼的相邻狼相邻(即有5头狼,打死了第二头狼,那么第一头和第三头相邻)。可以决定击败狼的次序。计算打败所有狼所需的最少伤害。

思路:
在区间[ i ,j ]内:
d p [ i ] [ j ] = min ⁡ k = i j d p [ i ] [ k − 1 ] + d p [ k + 1 ] [ j ] + a [ k ] + b [ i − 1 ] + b [ j + 1 ] dp[i][j]=\min_{k=i}^{j}dp[i][k-1]+dp[k+1][j]+a[k]+b[i-1]+b[j+1] dp[i][j]=k=iminj​dp[i][k−1]+dp[k+1][j]+a[k]+b[i−1]+b[j+1]

代码

#include <iostream>
#include <algorithm>
#define DEBUG freopen("_in.txt", "r", stdin); freopen("_out1.txt", "w", stdout);
#define CASEE int t; cin >> t; for (int ti = 1; ti <= t; ti++)
using namespace std;
const int MAXN = 210;
const int INF = 1e9;
int a[MAXN], b[MAXN], dp[MAXN][MAXN];
void solve(){
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i]);
	for (int i = 1; i <= n; i++)
		scanf("%d", &b[i]);
	b[n+1] = 0;
	for (int i = 1; i <= n; i++)
		dp[i][i] = a[i] + b[i-1] + b[i+1];
	for (int len = 1; len < n; len++)
		for (int i = 1; i <= n - len; i++){
			int j = i + len;
			dp[i][j] = INF;
			for (int k = i; k <= j; k++)
				dp[i][j] = min(dp[i][j], dp[i][k-1] + dp[k+1][j] + a[k] + b[i-1] + b[j+1]);
		}
	printf("%d\n", dp[1][n]);
}
int main(){
	CASEE{
		printf("Case #%d: ", ti);
		solve();
	}
	return 0;
}

标签:5115,hdu,int,相邻,Wolf,freopen,ti,txt,dp
来源: https://blog.csdn.net/ymxyld/article/details/113800977