A:创历史新低dalao:d<=5,所以一个位置上只能是[i-d,i+d]，考虑状压ljx'scode#include<bits/stdc++.h>usingnamespacestd;constintmaxn=505;constintmod=998244353;intread(){ intret=0,f=1;charch=getchar(); while(!isdigit(ch)){if(ch=='-')f=-f;