Splay模版题
调试两天总算A啦！
2016/2/21 *1
2016/3/20 *1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | #include<cstdio>#include<algorithm>using namespace std;int n,a[1000005],m;struct Node{int v,mx,sum,lx,rx,siz,tag,rev;Node *ch[2],*fa;Node(int val,Node *fat);void Pushdown();void Pushup();}*root,*Null;Node::Node(int val=0,Node *fat=Null){ch[0]=ch[1]=Null;fa=fat;v=sum=mx=val;tag=rev=0;siz=1;if(v>=0)lx=rx=v;else lx=rx=0;}void Node::Pushdown(){if(tag){ tag=rev=0; if(ch[0]!=Null){ch[0]->tag=1;ch[0]->sum=ch[0]->siz*v;ch[0]->v=v;} if(ch[1]!=Null){ch[1]->tag=1;ch[1]->sum=ch[1]->siz*v;ch[1]->v=v;} if(v>=0){ if(ch[0]!=Null){ch[0]->lx=ch[0]->mx=ch[0]->rx=v*ch[0]->siz;} if(ch[1]!=Null){ch[1]->lx=ch[1]->mx=ch[1]->rx=v*ch[1]->siz;} } else { if(ch[0]!=Null){ch[0]->mx=v;ch[0]->lx=ch[0]->rx=0;} if(ch[1]!=Null){ch[1]->mx=v;ch[1]->lx=ch[1]->rx=0;} }}if(rev){ rev=0; if(ch[0]!=Null)ch[0]->rev^=1; if(ch[1]!=Null)ch[1]->rev^=1; swap(ch[0]->ch[0],ch[0]->ch[1]); swap(ch[1]->ch[0],ch[1]->ch[1]); swap(ch[0]->lx,ch[0]->rx); swap(ch[1]->lx,ch[1]->rx);}}void Node::Pushup(){siz=ch[0]->siz+ch[1]->siz+1;sum=ch[0]->sum+ch[1]->sum+v;mx=max(ch[0]->mx,ch[1]->mx);mx=max(mx,ch[0]->rx+v+ch[1]->lx);lx=max(ch[0]->lx,ch[0]->sum+v+ch[1]->lx);rx=max(ch[1]->rx,ch[1]->sum+v+ch[0]->rx);}void Rotate(Node *x,int kind){Node *y=x->fa,*z=y->fa;y->ch[!kind]=x->ch[kind];if(x->ch[kind]!=Null)x->ch[kind]->fa=y;x->fa=z;if(z!=Null)z->ch[z->ch[1]==y]=x;y->fa=x;x->ch[kind]=y;y->Pushup();x->Pushup();}void Splay(Node *x,Node *place){while(x->fa!=place){ Node *y=x->fa,*z=y->fa; if(z==Null || z==place)Rotate(x,y->ch[0]==x); else { if(y->ch[0]==x && z->ch[0]==y){Rotate(y,1);Rotate(x,1);} else if(y->ch[0]==x && z->ch[1]==y){Rotate(x,1);Rotate(x,0);} else if(y->ch[1]==x && z->ch[0]==y){Rotate(x,0);Rotate(x,1);} else {Rotate(y,0);Rotate(x,0);} }}if(place==Null)root=x;}Node *Find(Node *splay,int k){splay->Pushdown();if(splay->ch[0]->siz+1==k)return splay;if(splay->ch[0]->siz>=k)return Find(splay->ch[0],k);return Find(splay->ch[1],k-1-splay->ch[0]->siz);}Node *Split(int pos,int tot){Node *x=Find(root,pos);Splay(x,Null);Node *y=Find(root,pos+tot+1);Splay(y,root);return y->ch[0];}Node *Build(int l,int r){if(l>r)return Null;int mid=l+r>>1;Node *splay=new Node(a[mid],Null);splay->ch[0]=Build(l,mid-1);if(splay->ch[0]!=Null)splay->ch[0]->fa=splay;splay->ch[1]=Build(mid+1,r);if(splay->ch[1]!=Null)splay->ch[1]->fa=splay;splay->Pushup();return splay;}void Insert(int pos,int tot){Node *x=Find(root,pos+1),*y=Find(root,pos+2);Splay(x,Null);Splay(y,root);y->ch[0]=Build(1,tot);if(y->ch[0]!=Null)y->ch[0]->fa=y;y->Pushup();x->Pushup();}Node *GetNull(){Node *p=new Node(0,Null);p->fa=p->ch[0]=p->ch[1]=p;p->mx=p->v=-1000000000;p->rev=p->tag=p->siz=p->sum=p->lx=p->rx=0;return p;}void Build_First(){Null=GetNull();a[1]=-1000000000;a[n+2]=-1000000000;root=Build(1,n+2);}void Del_Tree(Node *splay){if(splay==Null)return;splay->Pushdown();Del_Tree(splay->ch[0]);Del_Tree(splay->ch[1]);if(splay->ch[0]!=Null)delete splay->ch[0];if(splay->ch[1]!=Null)delete splay->ch[1];splay->ch[0]=Null;splay->ch[1]=Null;splay->Pushup();}void Delete(int pos,int val){Node *seq=Split(pos,val),*fat=seq->fa;Del_Tree(seq);if(seq!=Null)delete seq;fat->ch[0]=Null;fat->Pushup();fat->fa->Pushup();}void MakeSame(int pos,int tot,int val){Node *seq=Split(pos,tot),*fat=seq->fa;seq->tag=1;seq->sum=seq->siz*val;seq->v=val;if(val>=0)seq->lx=seq->rx=seq->mx=seq->siz*val;else seq->lx=seq->rx=0,seq->mx=val;fat->Pushup();fat->fa->Pushup();}void Reverse(int pos,int tot){Node *seq=Split(pos,tot),*fat=seq->fa;if(!seq->tag){ seq->rev^=1; swap(seq->ch[0],seq->ch[1]); swap(seq->lx,seq->rx); fat->Pushup(); fat->fa->Pushup();}}int GetSum(int pos,int tot){Node *seq=Split(pos,tot);return seq->sum;}int main(){freopen("1500.in","r",stdin);freopen("1500.out","w",stdout);scanf("%d %d",&n,&m);for(int i=2;i<=n+1;i++)scanf("%d",&a[i]);Build_First();for(int i=1;i<=m;i++){ char s[10]; scanf("%s",s); if(s[0]=='I'){ int pos,tot; scanf("%d %d",&pos,&tot); for(int i=1;i<=tot;i++)scanf("%d",&a[i]); Insert(pos,tot); } if(s[0]=='D'){ int pos,tot; scanf("%d %d",&pos,&tot); Delete(pos,tot); } if(s[0]=='M' && s[2]=='K'){ int pos,tot,val; scanf("%d %d %d",&pos,&tot,&val); MakeSame(pos,tot,val); } if(s[0]=='M' && s[2]=='X'){ printf("%d\n",root->mx); } if(s[0]=='R'){ int pos,tot; scanf("%d %d",&pos,&tot); Reverse(pos,tot); } if(s[0]=='G'){ int pos,tot; scanf("%d %d",&pos,&tot); printf("%d\n",GetSum(pos,tot)); }}return 0;} |
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