个人整理的数组splay板子，指针的写的太丑了就不放了。。

splay的板子。。

由于被LCT榨干了。。所以昨天去学了数组版的splay，现在整理一下板子。。

以BZOJ3224和3223为例题。。暂时只有这些，序列的话等有时间把维修序列给弄上来！！

BZOJ 3224 平衡树的操作

#include <bits/stdc++.h>
#define INF 0x3f3f3f3f
#define full(a, b) memset(a, b, sizeof a)
using namespace std;
typedef long long ll;
inline int lowbit(int x){ return x & (-x); }
inline int read(){
    int X = 0, w = 0; char ch = 0;
    while(!isdigit(ch)) { w |= ch == '-'; ch = getchar(); }
    while(isdigit(ch)) X = (X << 3) + (X << 1) + (ch ^ 48), ch = getchar();
    return w ? -X : X;
}
inline int gcd(int a, int b){ return a % b ? gcd(b, a % b) : b; }
inline int lcm(int a, int b){ return a / gcd(a, b) * b; }
template<typename T>
inline T max(T x, T y, T z){ return max(max(x, y), z); }
template<typename T>
inline T min(T x, T y, T z){ return min(min(x, y), z); }
template<typename A, typename B, typename C>
inline A fpow(A x, B p, C lyd){
    A ans = 1;
    for(; p; p >>= 1, x = 1LL * x * x % lyd)if(p & 1)ans = 1LL * x * ans % lyd;
    return ans;
}

const int N = 300005;
int ch[N][2], val[N], size[N], num[N], fa[N], root, tot;

int newNode(int p, int v){
    val[++tot] = v, fa[tot] = p;
    size[tot] = num[tot] = 1, ch[tot][0] = ch[tot][1] = 0;
    return tot;
}

void push_up(int x){
    size[x] = size[ch[x][0]] + size[ch[x][1]] + num[x];
}

void rotate(int x){
    int y = fa[x], z = fa[y], p = (ch[y][1] == x) ^ 1;
    ch[y][p^1] = ch[x][p], fa[ch[x][p]] = y;
    fa[x] = z, ch[z][ch[z][1] == y] = x, fa[y] = x, ch[x][p] = y;
    push_up(y), push_up(x);
}

void splay(int x, int goal){
    if(x == goal) return;
    while(fa[x] != goal){
        int y = fa[x], z = fa[y];
        if(z != goal){
            if((ch[y][0] == x) ^ (ch[z][0] == y)) rotate(x);
            else rotate(y);
        }
        rotate(x);
    }
    push_up(x);
    if(goal == 0) root = x;
}

void insert(int x){
    if(!root){
        root = newNode(0, x);
        return;
    }
    int cur = root;
    while(ch[cur][x > val[cur]]){
        if(val[cur] == x) break;
        cur = ch[cur][x > val[cur]];
    }
    if(val[cur] == x) size[cur] ++, num[cur] ++, splay(cur, 0);
    else ch[cur][x > val[cur]] = newNode(cur, x), splay(ch[cur][x > val[cur]], 0);
}

void find(int x){
    if(!root) return;
    int cur = root;
    while(val[cur] != x && ch[cur][x > val[cur]])
        cur = ch[cur][x > val[cur]];
    splay(cur, 0);
}

int precursor(int x){
    find(x);
    if(val[root] < x) return root;
    int cur = ch[root][0];
    while(ch[cur][1]) cur = ch[cur][1];
    return cur;
}

int successor(int x){
    find(x);
    if(val[root] > x) return root;
    int cur = ch[root][1];
    while(ch[cur][0]) cur = ch[cur][0];
    return cur;
}

void del(int x){
    int pre = precursor(x), suc = successor(x);
    splay(pre, 0), splay(suc, root);
    int key = ch[suc][0];
    if(num[key] > 1) num[key] --, size[key] --, splay(key, 0);
    else ch[suc][0] = 0;
    push_up(suc), push_up(root);
}

int ranks(int x){
    find(x);
    return size[ch[root][0]] + 1;
}

int select(int k){
    int cur = root, m = size[ch[cur][0]];
    while(1){
        if(k > m + num[cur]){
            k -= m + num[cur];
            cur = ch[cur][1];
        }
        else{
            //cout << m << endl;
            if(m >= k) cur = ch[cur][0];
            else return val[cur];
        }
        m = size[ch[cur][0]];
    }
}

void inOrder(int x){
    if(!x) return;
    inOrder(ch[x][0]);
    cout << val[x] << " ";
    inOrder(ch[x][1]);
}

int main(){

    int n = read();
    insert(-INF), insert(INF);
    for(int i = 0; i < n; i ++){
        int opt = read(), x = read();
        if(opt == 1) insert(x);
        else if(opt == 2) del(x);
        else if(opt == 3) printf("%d\n", ranks(x) - 1);
        else if(opt == 4) printf("%d\n", select(x + 1));
        else if(opt == 5) printf("%d\n", val[precursor(x)]);
        else if(opt == 6) printf("%d\n", val[successor(x)]);
        //inOrder(root);puts("");
    }
    return 0;
}

BZOJ 3223 文艺平衡树，虽然只有一个反转。。

#include <bits/stdc++.h>
#define INF 0x3f3f3f3f
#define full(a, b) memset(a, b, sizeof a)
using namespace std;
typedef long long ll;
inline int lowbit(int x){ return x & (-x); }
inline int read(){
    int X = 0, w = 0; char ch = 0;
    while(!isdigit(ch)) { w |= ch == '-'; ch = getchar(); }
    while(isdigit(ch)) X = (X << 3) + (X << 1) + (ch ^ 48), ch = getchar();
    return w ? -X : X;
}
inline int gcd(int a, int b){ return a % b ? gcd(b, a % b) : b; }
inline int lcm(int a, int b){ return a / gcd(a, b) * b; }
template<typename T>
inline T max(T x, T y, T z){ return max(max(x, y), z); }
template<typename T>
inline T min(T x, T y, T z){ return min(min(x, y), z); }
template<typename A, typename B, typename C>
inline A fpow(A x, B p, C lyd){
    A ans = 1;
    for(; p; p >>= 1, x = 1LL * x * x % lyd)if(p & 1)ans = 1LL * x * ans % lyd;
    return ans;
}

const int N = 100005;
int ch[N][2], val[N], fa[N], size[N], rev[N], tot, root;

int newNode(int p, int v){
    val[++tot] = v, fa[tot] = p, size[tot] = 1;
    ch[tot][0] = ch[tot][1] = rev[tot] = 0;
    return tot;
}

void reverse(int x){
    rev[x] ^= 1;
    swap(ch[x][0], ch[x][1]);
}

void push_up(int x){
    if(!x) return;
    size[x] = size[ch[x][0]] + size[ch[x][1]] + 1;
}

void push_down(int x){
    if(rev[x]){
        reverse(ch[x][0]), reverse(ch[x][1]);
        rev[x] ^= 1;
    }
}

int buildTree(int p, int l, int r){
    if(l > r) return 0;
    int mid = (l + r) >> 1;
    int cur = newNode(p, mid);
    ch[cur][0] = buildTree(cur, l, mid - 1);
    ch[cur][1] = buildTree(cur, mid + 1, r);
    push_up(cur);
    return cur;
}

void rotate(int x){
    int y = fa[x], z = fa[y], p = (ch[y][1] == x) ^ 1;
    push_down(y), push_down(x);
    ch[y][p^1] = ch[x][p], fa[ch[x][p]] = y;
    fa[x] = z, ch[z][ch[z][1] == y] = x, fa[y] = x, ch[x][p] = y;
    push_up(y), push_up(x);
}

void splay(int x, int goal){
    if(x == goal) return;
    while(fa[x] != goal){
        int y = fa[x], z = fa[y];
        if(z != goal){
            if((ch[y][0] == x) ^ (ch[z][0] == y)) rotate(x);
            rotate(y);
        }
        rotate(x);
    }
    push_up(x);
    if(goal == 0) root = x;
}

int find(int k){
    if(!root) return 0;
    int cur = root, m = size[ch[cur][0]];
    while(1){
        push_down(cur);
        if(m < k){
            k -= m + 1;
            cur = ch[cur][1];
        }
        else{
            if(m >= k + 1) cur = ch[cur][0];
            else return cur;
        }
        m = size[ch[cur][0]];
    }
}

void re(int l, int r){
    int x = find(l - 1), y = find(r + 1);
    splay(x, 0), splay(y, root);
    reverse(ch[ch[root][1]][0]);
}

void inOrder(int x){
    if(!x) return;
    push_down(x);
    inOrder(ch[x][0]);
    if(val[x]) printf("%d ", val[x]);
    inOrder(ch[x][1]);
}

int main(){

    int n = read(), m = read();
    root = newNode(0, 0), ch[root][1] = newNode(root, 0);
    ch[ch[root][1]][0] = buildTree(ch[root][1], 1, n);
    while(m --){
        int l = read(), r = read();
        re(l, r);
    }
    inOrder(root);
    return 0;
}