善良的王学长竟然亲自打了一遍QAQ好感动QAQ
1 #include<iostream> 2 #include<cstdio> 3 #include<cmath> 4 #include<algorithm> 5 #include<queue> 6 #include<cstring> 7 #define PAU putchar(' ') 8 #define ENT putchar(' ') 9 using namespace std; 10 const int maxn=100000+10; 11 inline int read(){ 12 int x=0,sig=1;char ch=getchar(); 13 while(!isdigit(ch)){if(ch=='-')sig=-1;ch=getchar();} 14 while(isdigit(ch))x=10*x+ch-'0',ch=getchar(); 15 return x*=sig; 16 } 17 inline void write(int x){ 18 if(x==0){putchar('0');return;}if(x<0)putchar('-'),x=-x; 19 int len=0,buf[15];while(x)buf[len++]=x%10,x/=10; 20 for(int i=len-1;i>=0;i--)putchar(buf[i]+'0');return; 21 } 22 struct node { 23 node *ch[2],*fa; 24 bool rev; 25 int x,sum,siz,mul,add; 26 inline void add_rev_tag(){ 27 swap(ch[0],ch[1]);rev^=1;return; 28 } 29 inline void add_plus_tag(int a){ 30 sum+=siz*a;x+=a;add+=a;return; 31 } 32 inline void add_mul_tag(int m){ 33 sum*=m;x*=m;mul*=m;add*=add*m;return; 34 } 35 inline void down(){ 36 if(rev){ 37 if(ch[0]) ch[0]->add_rev_tag(); 38 if(ch[1]) ch[1]->add_rev_tag(); 39 rev=0; 40 } 41 if(add){ 42 if(ch[0]) ch[0]->add_plus_tag(add); 43 if(ch[1]) ch[1]->add_plus_tag(add); 44 add=0; 45 } 46 if(mul>1){ 47 if(ch[0]) ch[0]->add_mul_tag(mul); 48 if(ch[1]) ch[1]->add_mul_tag(mul); 49 mul=1; 50 } return; 51 } 52 inline void update(){ 53 sum=x;siz=1; 54 if(ch[0]) sum+=ch[0]->sum,siz+=ch[0]->siz; 55 if(ch[1]) sum+=ch[1]->sum,siz+=ch[1]->siz; 56 return; 57 } 58 }lct[maxn]; 59 inline int get_parent(node *x,node *&fa){return (fa=x->fa)?fa->ch[0]==x?0:fa->ch[1]==x?1:-1:-1;} 60 inline void rotate(node *x){ 61 int t1,t2; 62 node *fa,*gfa; 63 t1=get_parent(x,fa); 64 t2=get_parent(fa,gfa); 65 if ((fa->ch[t1]=x->ch[t1^1])) fa->ch[t1]->fa=fa; 66 x->ch[t1^1]=fa;fa->fa=x;x->fa=gfa; 67 if (t2!=-1) gfa->ch[t2]=x; 68 fa->update();return; 69 } 70 inline void pushdown(node *x){ 71 static node *stack[maxn]; 72 int cnt=0; 73 while(1){ 74 stack[cnt++]=x; 75 node *fa=x->fa; 76 if (!fa || (fa->ch[0]!=x && fa->ch[1]!=x)) break; 77 x=fa; 78 } 79 while(cnt--) stack[cnt]->down(); 80 return; 81 } 82 inline node * splay(node *x){ 83 pushdown(x); 84 while(1){ 85 int t1,t2; 86 node *fa,*gfa; 87 t1=get_parent(x,fa); 88 if(t1==-1) break; 89 t2=get_parent(fa,gfa); 90 if(t2==-1){ 91 rotate(x);break; 92 } else if (t1==t2){ 93 rotate(fa);rotate(x); 94 } else{ 95 rotate(x);rotate(x); 96 } 97 } 98 x->update(); 99 return x; 100 } 101 inline node * access(node *x){ 102 node *ret=NULL; 103 while (x) splay(x)->ch[1]=ret,(ret=x)->update(),x=x->fa; 104 return ret; 105 } 106 inline void makeroot(int x){access(lct+x)->add_rev_tag();} 107 inline void link(int u,int v){ 108 makeroot(u);splay(lct+u)->fa=lct+v;return; 109 } 110 inline void cut(int u,int v){ 111 makeroot(u); 112 node *p=(access(lct+v),splay(lct+v)); 113 p->ch[0]->fa=NULL; 114 p->ch[0]=NULL; 115 p->update(); 116 } 117 int n,q; 118 int main(){ 119 n=read();q=read(); 120 int i; 121 for(i=1;i<=n;i++) { 122 lct[i].x=lct[i].sum=1; 123 lct[i].siz=1; 124 lct[i].mul=1; 125 } 126 for(i=1;i<n;i++){ 127 int u,v; 128 u=read();v=read(); 129 link(u,v); 130 } 131 while(q--){ 132 char ch=getchar(); 133 while(ch<=32) ch=getchar(); 134 int u,v,x,y,c; 135 if(ch=='+'){ 136 u=read();v=read();c=read(); 137 makeroot(u); 138 access(lct+v)->add_plus_tag(c); 139 }else if(ch=='-'){ 140 u=read();v=read();x=read();y=read(); 141 cut(u,v);link(x,y); 142 }else if(ch=='*'){ 143 u=read();v=read();c=read(); 144 makeroot(u); 145 access(lct+v)->add_mul_tag(c); 146 }else if(ch=='/'){ 147 u=read();v=read(); 148 makeroot(u); 149 printf("%u ",access(lct+v)->sum); 150 } 151 } 152 return 0; 153 }