BZOJ 2157: 旅游 （结构体存变量)

用结构体存变量好像确实能提高运行速度，以后就这么写数据结构了

Code: 

#include <cstdio>
#include <algorithm>
#include <cstring>
#define N 200003 
#define inf 100000
#define ll long long  
#define lson t[x].ch[0] 
#define rson t[x].ch[1] 
#define setIO(s) freopen(s".in" , "r" , stdin) 
using namespace std;  
int sta[N], n;          
struct Node 
{
    int ch[2], f , siz , rev ; 
    ll val , sum , mul , min , max; 
}t[N << 1];  
inline int get(int x) 
{
    return t[t[x].f].ch[1] == x; 
}
inline int isrt(int x) 
{
    return (!(t[t[x].f].ch[0] == x || t[t[x].f].ch[1] == x)) || (!x);     
}
inline void mark_rev(int x) 
{
    swap(lson , rson), t[x].rev ^= 1; 
}
inline void mark_mul(int x, ll y) 
{
    t[x].sum *= y, t[x].val *= y, t[x].mul *= y; 
    t[x].min *= y, t[x].max *= y, swap(t[x].min, t[x].max);                               
} 
inline void pushdown(int x) 
{
    if(t[x].rev) 
    {
        if(lson) mark_rev(lson); 
        if(rson) mark_rev(rson); 
        t[x].rev = 0; 
    }
    if(t[x].mul != 1) 
    {
        if(lson) mark_mul(lson , t[x].mul); 
        if(rson) mark_mul(rson , t[x].mul); 
        t[x].mul = 1; 
    } 
}
inline void pushup(int x) 
{
    t[x].siz = t[lson].siz + t[rson].siz + 1;
    t[x].sum = t[lson].sum + t[rson].sum + t[x].val ;     
    t[x].max = max(t[lson].max , t[rson].max) ;    
    t[x].min = min(t[lson].min , t[rson].min) ;    
    if(x > n) 
    {
        t[x].max = max(t[x].max , t[x].val);   
        t[x].min = min(t[x].min , t[x].val);     
    }
}
inline void rotate(int x) 
{ 
    int old = t[x].f , fold = t[old].f , which = get(x);  
    if(!isrt(old)) t[fold].ch[t[fold].ch[1] == old] = x;  
    t[old].ch[which] = t[x].ch[which ^ 1], t[t[old].ch[which]].f = old; 
    t[x].ch[which ^ 1] = old, t[old].f = x, t[x].f = fold;      
    pushup(old), pushup(x); 
}
inline void splay(int x) 
{  
    int v = 0, u = x, i ; 
    for(sta[++ v] = u ; !isrt(u) ; sta[++ v] = t[u].f , u = t[u].f); 
    for(u = t[u].f, i = v ; i ; -- i) pushdown(sta[i]);                                         
    for(int fa ; (fa = t[x].f) ^ u ; rotate(x)) 
        if(t[fa].f ^ u) 
            rotate(get(fa) == get(x) ? fa : x);        
}
inline void Access(int x) 
{
    int y = 0; 
    while(x) 
    {
        splay(x), rson = y, pushup(x), y = x, x = t[x].f;    
    }
}
inline void makeroot(int x) 
{
    Access(x), splay(x), mark_rev(x);  
}
inline void split(int x, int y) 
{
    makeroot(x), Access(y), splay(y); 
} 
inline void link(int x, int y) 
{ 
    makeroot(x), t[x].f = y;      
}
int main() 
{ 
    int i, j; 
    scanf("%d", &n);   
    for(i = 0; i < N ; ++i)  t[i].mul = 1; 
    for(i = 0; i <= n ; ++i) t[i].min = inf, t[i].max = -inf;      
    for(i = 1; i < n ; ++i) 
    {
        int u , v , c; 
        scanf("%d%d%d", &u , &v , &c);   
        ++ u , ++ v;    
        t[i + n].val = (ll)c, pushup(i + n), link(u, i + n), link(i + n, v);           
    }        
    int T , x, y;                         
    char str[9]; 
    scanf("%d", &T); 
    for(int cas = 1; cas <= T ; ++cas) 
    {
        scanf("%s%d%d", str, &x, &y);     
        if(str[1] == 'I')  split(x + 1, y + 1), printf("%lld\n", t[y + 1].min);  
        if(str[1] == 'A')  split(x + 1, y + 1), printf("%lld\n", t[y + 1].max);   
        if(str[0] == 'S')  split(x + 1, y + 1), printf("%lld\n", t[y + 1].sum);   
        if(str[0] == 'N')  split(x + 1, y + 1), mark_mul(y + 1, -1);             
        if(str[0] == 'C')  makeroot(x + n), t[x + n].val = (ll)y, pushup(x + n);      
    }
    return 0;     
}