P5597 【XR-4】复读

题目通道\]([【XR-4】复读 - 洛谷](https://www.luogu.com.cn/problem/P5597 "【XR-4】复读 - 洛谷")) ```cpp #include #define inf 2147483647 using namespace std; struct ed{ int ls,rs,f,sz,dd; }p[3000],c[3000]; string s; int st,lq,ans=inf/2; int build(int fa,int poi){ p[poi].f=fa; p[poi].sz=1; p[poi].dd=p[fa].dd+1; if (s[poi]=='3') { p[poi].ls=build(poi,poi+1), p[poi].sz+=p[p[poi].ls].sz; p[poi].rs=build(poi,poi+p[poi].sz), p[poi].sz+=p[p[poi].rs].sz;} if (s[poi]=='2') p[poi].rs=build(poi,poi+1), p[poi].sz+=p[p[poi].rs].sz; if (s[poi]=='1') p[poi].ls=build(poi,poi+1), p[poi].sz+=p[p[poi].ls].sz; return poi; } int gd(int now,string t) { int l=t.size(); for (int i=0;i>s; lq=s.size(); s='.'+s; build(0,1); search(1,""); cout<