如题，是一个模板。。。
Splay：
1 #include <algorithm> 2 #include <iostream> 3 #include <cstring> 4 #include <cstdio> 5 #include <cctype> 6 7 inline void read(int & x) 8 { 9 x = 0; 10 int k = 1; 11 char c = getchar(); 12 while (!isdigit(c)) 13 if (c == '-') c = getchar(), k = -1; 14 else c = getchar(); 15 while (isdigit(c)) 16 x = (x << 1) + (x << 3) + (c ^ 48), 17 c = getchar(); 18 x *= k; 19 } 20 21 const int MAXN = 101015; 22 int n, m, x, y; 23 24 int a[101010]; 25 26 struct SplayHello 27 { 28 int rt = 0, tot = 0; 29 int cnt[MAXN]; 30 int siz[MAXN]; 31 int tag[MAXN]; 32 int val[MAXN]; 33 int faz[MAXN]; 34 int son[MAXN][2]; 35 36 int Getson(int u) 37 { 38 return son[faz[u]][1] == u; 39 } 40 41 void Update(int u) 42 { 43 siz[u] = siz[son[u][0]] + siz[son[u][1]] + cnt[u]; 44 } 45 46 void Pushdown(int u) //ok 47 { 48 if (!tag[u] || !u) return; 49 if (son[u][0]) tag[son[u][0]] ^= 1; 50 if (son[u][1]) tag[son[u][1]] ^= 1; 51 son[u][0] ^= son[u][1], 52 son[u][1] ^= son[u][0], 53 son[u][0] ^= son[u][1]; 54 tag[u] = 0; 55 } 56 57 int Build(int dad, int l, int r) //ok 58 { 59 if (l > r) return 0; 60 int mid = (l + r) >> 1; 61 int now = ++tot; 62 tag[now] = 0; 63 faz[now] = dad; 64 val[now] = a[mid]; 65 cnt[now] = siz[now] = 1; 66 son[now][0] = Build(now, l, mid - 1); 67 son[now][1] = Build(now, mid + 1, r); 68 //²»ÄÜÓÃtotµ±¸¸Ç×£¬»á¸Ä±ä 69 Update(now); 70 return now; 71 } 72 73 void Rotate(int u) //ok 74 { 75 int y = faz[u], z = faz[y], ch = Getson(u); 76 Pushdown(y), Pushdown(u); 77 int b = son[u][ch ^ 1]; 78 int d = Getson(y); 79 son[u][ch ^ 1] = y, son[y][ch] = b; 80 faz[y] = u, faz[b] = y, faz[u] = z; 81 if (z) son[z][d] = u; 82 Update(y), Update(u); 83 } 84 85 void Splay(int u, int tar) //ok 86 { 87 while (faz[u] != tar) 88 { 89 if (faz[faz[u]] != tar) 90 if (Getson(u) == Getson(faz[u])) Rotate(faz[u]); 91 else Rotate(u); 92 Rotate(u); 93 } 94 if (!tar) rt = u; 95 } 96 97 int GetKth(int k) 98 { 99 int now = rt; 100 while (true) 101 { 102 Pushdown(now); 103 if (siz[son[now][0]] >= k) now = son[now][0]; 104 else if (siz[son[now][0]] + cnt[now] >= k) return now; 105 else k -= siz[son[now][0]] + cnt[now], now = son[now][1]; 106 } 107 } 108 109 void Rever(int l, int r) 110 { 111 int L = GetKth(l - 1); 112 int R = GetKth(r + 2); 113 Splay(L, 0); Splay(R, L); 114 tag[son[son[rt][1]][0]] ^= 1; 115 Update(L), Update(R), Update(son[R][0]); 116 } 117 118 void print(int u) 119 { 120 Pushdown(u); 121 if (son[u][0]) print(son[u][0]); 122 if (val[u] != -2147483600 && val[u] != 2147483600) 123 printf("%d ", val[u]); 124 if (son[u][1]) print(son[u][1]); 125 } 126 127 void BuildT(int l, int r) 128 { 129 rt = Build(0, l, r); 130 } 131 132 void printT() 133 { 134 print(rt); 135 } 136 }splay; 137 138 signed main() 139 { 140 read(n), read(m); 141 for (int i = 1; i <= n; ++i) a[i] = i; 142 a[n + 1] = 2147483600; 143 a[0] = -2147483600; 144 splay.BuildT(0, n + 1); 145 for (int i = 1; i <= m; ++i) 146 { 147 read(x), read(y); 148 splay.Rever(x, y); 149 } 150 splay.printT(); 151 return 0; 152 }
FHQ：：
1 #include <algorithm> 2 #include <iostream> 3 #include <cstring> 4 #include <cstdio> 5 #include <cctype> 6 7 inline void read(int & x) 8 { 9 x = 0; 10 int k = 1; 11 char c = getchar(); 12 while (!isdigit(c)) 13 if (c == '-') c = getchar(), k = -1; 14 else c = getchar(); 15 while (isdigit(c)) 16 x = (x << 1) + (x << 3) + (c ^ 48), 17 c = getchar(); 18 x *= k; 19 } 20 21 const int MAXN = 1e5 + 999; 22 int seed = 1024, n, m, l, r, rt = 0, tot = 0, rnd[MAXN], tag[MAXN], val[MAXN], siz[MAXN], son[MAXN][2]; 23 24 inline int Rand(void) 25 { 26 return seed = (int)seed * 462711LL % 2147483647; 27 } 28 29 inline int New(int x) 30 { 31 ++tot; 32 siz[tot] = 1; 33 val[tot] = x; 34 rnd[tot] = Rand(); 35 tag[tot] = son[tot][1] = son[tot][0] = 0; 36 return tot; 37 } 38 39 inline void Swap(int &a, int &b) 40 { 41 a ^= b, b ^= a, a ^= b; 42 } 43 44 inline void Pushup(int u) 45 { 46 siz[u] = siz[son[u][0]] + siz[son[u][1]] + 1; 47 } 48 49 inline void Pushdown(int u) 50 { 51 if (!tag[u]) return; 52 tag[son[u][0]] ^= 1; 53 tag[son[u][1]] ^= 1; 54 Swap(son[u][0], son[u][1]); 55 tag[u] = 0; 56 } 57 58 inline void Split(int u, int k, int &a, int &b) 59 { 60 if (!u) { a = b = 0; return; } 61 Pushdown(u); 62 if (k <= siz[son[u][0]]) b = u, Split(son[u][0], k, a, son[b][0]); 63 else a = u, Split(son[u][1], k - siz[son[u][0]] - 1, son[a][1], b); 64 Pushup(u); 65 } 66 67 inline void Merge(int & u, int a, int b) 68 { 69 if (!a || !b) { u = a | b; return; } 70 if (rnd[a] < rnd[b]) u = a, Pushdown(a), Merge(son[u][1], son[a][1], b), Pushup(a); 71 else u = b, Pushdown(b), Merge(son[u][0], a, son[b][0]), Pushup(b); 72 } 73 74 inline void Insert(int x) 75 { 76 int u = New(x); 77 Merge(rt, rt, u); 78 } 79 80 inline void Print(int u) 81 { 82 if (!u) return; 83 Pushdown(u); 84 Print(son[u][0]); 85 printf("%d ", val[u]); 86 Print(son[u][1]); 87 } 88 89 int a, b, c; 90 91 signed main() 92 { 93 read(n), read(m); 94 for (int i = 1; i <= n; ++i) Insert(i); 95 for (int i = 1; i <= m; ++i) 96 { 97 a = b = c = 0; 98 read(l), read(r); 99 Split(rt, r, a, b); 100 Split(a, l - 1, a, c); 101 tag[c] ^= 1; 102 Merge(a, a, c); 103 Merge(rt, a, b); 104 } 105 Print(rt); 106 return 0; 107 }