Splay模板(序列终结者)

Posted 2022-11-09 Code--Dream

我只是一个存模板的，详细的请看这里 http://blog.csdn.net/whai362/article/details/47298133

 题目链接：http://www.codevs.cn/problem/4655/

  1 #include <cstdio>
  2 #include <cstring>
  3 #include <cctype>
  4 #include <cmath>
  5 #include <set>
  6 #include <map>
  7 #include <list>
  8 #include <queue>
  9 #include <deque>
 10 #include <stack>
 11 #include <string>
 12 #include <vector>
 13 #include <iostream>
 14 #include <algorithm>
 15 #include <stdlib.h>
 16 #include <time.h>
 17 using namespace std;
 18 typedef long long LL;
 19 const int INF = 2e9 + 1e8;
 20 
 21 const int MOD = 1e9 + 7;
 22 const double eps = 0.0000000001;
 23  
 24 #define MSET(a, b) memset(a, b, sizeof(a))
 25 
 26 const int maxn = 1e6 + 10;
 27 int max(int a, int b, int c)
 28 
 29     return max(a, max(b, c));
 30 
 31 
 32 struct SplayTree
 33 
 34     struct Node
 35     
 36         int son[2], big, val, lazy, sz;
 37         bool rev;
 38         void init(int _val)
 39         
 40             val = big = _val;
 41             sz = 1;
 42             lazy = rev = son[0] = son[1] = 0;
 43         
 44      T[maxn];
 45     int root, fa[maxn];
 46     void pushup(int i)
 47     
 48         T[i].big=T[i].val,T[i].sz=1;
 49         if(T[i].son[0])
 50         
 51             T[i].big=max(T[i].big,T[T[i].son[0]].big);
 52             T[i].sz+=T[T[i].son[0]].sz;
 53         
 54         if(T[i].son[1])
 55         
 56             T[i].big=max(T[i].big,T[T[i].son[1]].big);
 57             T[i].sz+=T[T[i].son[1]].sz;
 58         
 59     
 60     void pushdown(int i)
 61     
 62         if (i == 0)
 63             return;
 64         if (T[i].lazy)
 65         
 66             for (int k = 0; k < 2; k++)
 67             
 68                 if (T[i].son[k])
 69                 
 70                     T[T[i].son[k]].lazy += T[i].lazy;
 71                     T[T[i].son[k]].val += T[i].lazy;
 72                     T[T[i].son[k]].big += T[i].lazy;
 73                 
 74             
 75             T[i].lazy = 0;
 76         
 77         if (T[i].rev)
 78         
 79             for (int k = 0; k < 2; k++)
 80                 if (T[i].son[k])
 81                     T[T[i].son[k]].rev ^= 1;
 82             swap(T[i].son[0], T[i].son[1]);
 83             T[i].rev = 0;
 84         
 85     
 86     /**  旋转操作
 87      * 传入x，旋转x与x的父亲这两个节点；
 88      */
 89     void rotate(int x, int d)
 90     
 91         int y = fa[x], z = fa[y];
 92         T[y].son[!d] = T[x].son[d], fa[T[x].son[d]] = y;
 93         T[x].son[d] = y, fa[y] = x;
 94         T[z].son[T[z].son[1] == y] = x, fa[x] = z;
 95         pushup(y);
 96     
 97     void splay(int x, int goal)
 98     
 99         if (x == goal)
100             return;
101         while (fa[x] != goal)
102         
103             int y = fa[x], z = fa[y];
104             pushdown(z), pushdown(y), pushdown(x);
105             int dirx = (T[y].son[0] == x), diry = (T[z].son[0] == y);
106             if (z == goal)
107                 rotate(x, dirx);
108             else
109             
110                 if (dirx == diry)
111                     rotate(y, diry);
112                 else
113                     rotate(x, dirx);
114                 rotate(x, diry);
115             
116         
117         pushup(x);
118         if (goal == 0)
119             root = x;
120     
121     /**
122      * select(pos) 返回第pos+1个元素；
123      */
124     int Select(int pos)
125     
126         int u = root;
127         pushdown(u);
128         while (T[T[u].son[0]].sz != pos)
129         
130             if (pos < T[T[u].son[0]].sz)
131                 u = T[u].son[0];
132             else
133             
134                 pos = pos - (1 + T[T[u].son[0]].sz);
135                 u = T[u].son[1];
136             
137             pushdown(u);
138         
139         return u;
140     
141     void update(int l, int r, int val)
142     
143         int x = Select(l - 1), y = Select(r + 1);
144         splay(x, 0);
145         splay(y, x);
146         T[T[y].son[0]].val += val;
147         T[T[y].son[0]].big += val;
148         T[T[y].son[0]].lazy += val;
149     
150     void turn(int l, int r)
151     
152         int x = Select(l - 1), y = Select(r + 1);
153         splay(x, 0);
154         splay(y, x);
155         T[T[y].son[0]].rev ^= 1;
156     
157     int query(int l, int r)
158     
159         int x = Select(l - 1), y = Select(r + 1);
160         splay(x, 0);
161         splay(y, x);
162         return T[T[y].son[0]].big;
163     
164     int build(int L, int R)
165     
166         if (L > R)
167             return 0;
168         if (L == R)
169             return L;
170         int mid = (L + R) >> 1, sL, sR;
171         T[mid].son[0] = sL = build(L, mid - 1);
172         T[mid].son[1] = sR = build(mid + 1, R);
173         fa[sL] = fa[sR] = mid;
174         pushup(mid);
175         return mid;
176     
177 
178     void init(int n)
179     
180         T[1].init(-INF), T[n + 2].init(-INF);
181         for (int i = 2; i <= n + 1; i++)
182             T[i].init(0);
183         root = build(1, n + 2), fa[root] = 0;
184         fa[0] = 0, T[0].son[1] = root, T[0].sz = 0;
185     
186  re;
187 
188 int main()
189 
190     int n, m;
191     scanf("%d%d", &n, &m);
192     re.init(n);
193     for (int i = 0, a, b, c, d; i < m; i++)
194     
195         scanf("%d", &a);
196         if (a == 1)
197         
198             scanf("%d%d%d", &b, &c, &d);
199             re.update(b, c, d);
200         
201         else if (a == 2)
202         
203             scanf("%d%d", &b, &c);
204             re.turn(b, c);
205         
206         else
207         
208             scanf("%d%d", &b, &c);
209             printf("%d\\n", re.query(b, c));
210         
211     
212     return 0;
213 
214 
215 /**************************************************/
216 /**             Copyright Notice                 **/
217 /**  writer: wurong                              **/
218 /**  school: nyist                               **/
219 /**  blog  : http://blog.csdn.net/wr_technology  **/
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