洛谷P2029跳舞

题目
DP, 用的$dp[i][j]$表示$i$之前的数选了$j$个得到的最大结果，然后状态转移方程应该是

$$if (j \% t == 0)~~dp[i][j] = max(dp[i][j], max(dp[i - 1][j] - S[i], dp[i - 1][j - 1] + S[i] + B[i]) );$$

$$else~~dp[i][j] = max(dp[i][j], max(dp[i - 1][j] - S[i], dp[i - 1][j - 1] + S[i]) );$$

#include <iostream>
#include <cstdio>	
#include <algorithm>
using namespace std;
int n, t, maxn;		
int S[1001010], B[100010];
int sums[1001001], sumb[101001];
int dp[5001][5001];//dp[i][j]表示前i个数已经连续跳了j次的最大得分, j属于1到t
int main()                      
{
 	scanf("%d%d", &n, &t);		
 	for (int i = 1; i <= n; i++)
		scanf("%d", &S[i]);
 	for (int i = 1; i <= n; i++)
		scanf("%d", &B[i]);
 	for (int i = 1; i <= n; i++)
		dp[i][0] = dp[i - 1][0] - S[i];//初始化为负的前缀和，因为不选会扣分。 
 	for (int i = 1; i <= n; i++)
 		for (int j = i; j >= 1; j--)
 		{
 			if (j % t == 0)//
 				dp[i][j] = max(dp[i][j], max(dp[i - 1][j] - S[i], dp[i - 1][j - 1] + S[i] + B[i]) ); // [i-1][j]说明i这个位置的数不选。 
			else
				dp[i][j] = max(dp[i][j], max(dp[i - 1][j] - S[i], dp[i - 1][j - 1] + S[i])  );
	 	}
 	for (int i = 1; i <= n; i++)
 		maxn = max(maxn, dp[n][i]);
 	printf("%d", maxn);
 	return 0;
}