标签:tchar pre stdout getchar dir gis pushd sort reg
1 #include<bits/stdc++.h> 2 #define M 100010 3 #define RG register 4 #define inf 0x3f3f3f3f 5 using namespace std; 6 bool rev[M]; 7 set<int> tr; 8 set<int>::iterator it; 9 int m,rt,tp,big,cnt,cur,dau,dep,loc,sml,sum,tmp,c[M],fa[M],sz[M],dad[M],key[M],srt[M],sta[M],ch[2][M],son[2][M]; 10 inline int gi(){ 11 RG int x=0;RG char y=getchar(); 12 while(y<‘0‘||y>‘9‘) y=getchar(); 13 while(y>=‘0‘&&y<=‘9‘) x=x*10+y-‘0‘,y=getchar(); 14 return x; 15 } 16 inline bool cmp(RG const int &x,RG const int &y){ 17 return key[x]<key[y]; 18 } 19 inline bool isroot(RG int x){ 20 return son[0][fa[x]]!=x&&son[1][fa[x]]!=x; 21 } 22 inline void pushdown(RG int x){ 23 rev[x]=0; 24 rev[son[0][x]]^=1; 25 rev[son[1][x]]^=1; 26 swap(son[0][x],son[1][x]); 27 } 28 inline void pushup(RG int x){ 29 sz[x]=sz[son[0][x]]+sz[son[1][x]]+1; 30 } 31 inline void rot(RG int x){ 32 RG int f=fa[x],ff=fa[f]; 33 RG bool dir=son[1][f]==x; 34 if(!isroot(f)) son[son[1][ff]==f][ff]=x; 35 fa[x]=ff; 36 son[dir][f]=son[dir^1][x]; 37 fa[son[dir^1][x]]=f;son[dir^1][x]=f;fa[f]=x; 38 pushup(f);pushup(x); 39 } 40 inline void spl(RG int x){ 41 tp=0;sta[++tp]=x; 42 for (RG int i=x;!isroot(i);i=fa[i]) 43 sta[++tp]=fa[i]; 44 for (RG int i=tp;i;--i) 45 if(rev[sta[i]]) 46 pushdown(sta[i]); 47 while(!isroot(x)){ 48 RG int f=fa[x],ff=fa[f]; 49 if(!isroot(f)){ 50 if((son[0][ff]==f)^(son[1][f]==x)) rot(x); 51 else rot(f); 52 } 53 rot(x); 54 } 55 } 56 inline void acs(RG int x){ 57 RG int y=0; 58 while(x){ 59 spl(x); 60 son[1][x]=y; 61 pushup(x); 62 y=x;x=fa[x]; 63 } 64 } 65 inline void mkrt(RG int x){ 66 acs(x);spl(x); 67 rev[x]^=1; 68 } 69 inline int query(RG int x){ 70 mkrt(rt); 71 acs(x);spl(x); 72 return sz[x]; 73 } 74 inline void link(RG int x,RG int y){ 75 if(!x||!y||x==y) return; 76 mkrt(x);fa[x]=y; 77 } 78 inline void cut(RG int x,RG int y){ 79 if(!x||!y||x==y) return; 80 mkrt(x);acs(y);spl(y); 81 fa[x]=son[0][y]=0;pushup(y); 82 } 83 inline void update(RG int x,RG bool op1,RG bool op2){ 84 RG int f=dad[x];dau=ch[op1][x]; 85 if(op2&&x==rt) rt=dau; 86 if(!op2) ch[op1][x]=rt,dad[rt]=x,dad[x]=0; 87 ch[op1^1][f]=dau;dad[dau]=f; 88 if(op2) ch[op1][x]=dad[x]=0; 89 } 90 int main(){ 91 freopen("splay.in","r",stdin); 92 freopen("splay.out","w",stdout); 93 m=gi(); 94 for (RG int i=1;i<=m;++i){ 95 c[i]=gi();srt[i]=i; 96 key[i]=c[i]<2?gi():inf; 97 } 98 sort(srt+1,srt+m+1,cmp); 99 for (RG int i=1;i<=m&&c[srt[i]]<2;++i) 100 key[srt[i]]=++sum; 101 tr.insert(-inf);tr.insert(inf); 102 for (RG int i=1;i<=m;++i) 103 if(c[i]==1){ 104 if(!cnt){ 105 rt=key[i]; 106 puts("1"); 107 } 108 else{ 109 it=tr.upper_bound(key[i]); 110 big=*it;--it;sml=*it;dep=0; 111 if(sml>-inf){tmp=query(sml);if(dep<tmp) loc=sml,dep=tmp;} 112 if(big< inf){tmp=query(big);if(dep<tmp) loc=big,dep=tmp;} 113 dad[key[i]]=loc;ch[key[i]>loc][loc]=key[i];link(loc,key[i]); 114 printf("%d\n",dep+1); 115 } 116 tr.insert(key[i]);++cnt; 117 } 118 else if(c[i]==2) 119 if(cnt==1) puts("1"); 120 else{ 121 it=tr.begin();++it; 122 cur=*it;RG int f=dad[cur];dau=ch[1][cur];printf("%d\n",query(cur)); 123 if(cur!=rt) cut(cur,f),cut(cur,dau),link(cur,rt),link(f,dau),update(cur,1,0),rt=cur; 124 } 125 else if(c[i]==3) 126 if(cnt==1) puts("1"); 127 else{ 128 it=tr.end();--it;--it; 129 cur=*it;RG int f=dad[cur];dau=ch[0][cur];printf("%d\n",query(cur)); 130 if(cur!=rt) cut(cur,f),cut(cur,dau),link(cur,rt),link(f,dau),update(cur,0,0),rt=cur; 131 } 132 else if(c[i]==4){ 133 --cnt; 134 if(!cnt){ 135 puts("1"); 136 tr.erase(tr.find(rt)); 137 rt=0; 138 } 139 else{ 140 it=tr.begin();++it; 141 cur=*it;RG int f=dad[cur];dau=ch[1][cur]; 142 printf("%d\n",query(cur)); 143 cut(cur,f),cut(cur,dau),link(f,dau),tr.erase(cur);update(cur,1,1); 144 } 145 } 146 else{ 147 --cnt; 148 if(!cnt){ 149 puts("1"); 150 tr.erase(tr.find(rt)); 151 rt=0; 152 } 153 else{ 154 it=tr.end();--it;--it; 155 cur=*it;RG int f=dad[cur];dau=ch[0][cur];printf("%d\n",query(cur)); 156 cut(cur,f),cut(cur,dau),link(f,dau),tr.erase(cur);update(cur,0,1); 157 } 158 } 159 return 0; 160 }
[2017.11.29]BZOJ4825[Hnoi2017]单旋
标签:tchar pre stdout getchar dir gis pushd sort reg
原文地址:http://www.cnblogs.com/Super-Nick/p/7923278.html