摘要： https://nanti.jisuanke.com/t/31434 直接搬题解： https://www.cnblogs.com/dilthey/p/9757781.html 考虑普通的 dp[i][j]=∑a=L+1i∑b=D+1j((a==i&&b==j)?0:dp[a][b])dp[i][j 阅读全文