P5443 [APIO2019]桥梁 [分块+并查集]

标签：ble   cpp   fine   ring   void   stat   false   null   sed   

分块+并查集，大板子，没了。
并查集不路径压缩，可撤销，然后暴力删除
这样对于每个块都是独立的，所以直接搞就行了。
然后块内修改操作搞掉，就是单独的了

// powered by c++11
// by Isaunoya
#include 
#define rep(i, x, y) for (register int i = (x); i = (y); --i)
using namespace std;
using db = double;
using ll = long long;
using uint = unsigned int;
// #define int long long
using pii = pair;
#define ve vector
#define Tp template
#define all(v) v.begin(), v.end()
#define sz(v) ((int)v.size())
#define pb emplace_back
#define fir first
#define sec second
// the cmin && cmax
Tp void cmax(T& x, const T& y) {
  if (x  void cmin(T& x, const T& y) {
  if (x > y) x = y;
}
// sort , unique , reverse
Tp void sort(ve& v) { sort(all(v)); }
Tp void unique(ve& v) {
  sort(all(v));
  v.erase(unique(all(v)), v.end());
}
Tp void reverse(ve& v) { reverse(all(v)); }
const int SZ = 0x191981;
struct FILEIN {
  ~FILEIN() {}
  char qwq[SZ], *S = qwq, *T = qwq, ch;
  char GETC() { return (S == T) && (T = (S = qwq) + fread(qwq, 1, SZ, stdin), S == T) ? EOF : *S++; }
  FILEIN& operator>>(char& c) {
    while (isspace(c = GETC()))
      ;
    return *this;
  }
  FILEIN& operator>>(string& s) {
    while (isspace(ch = GETC()))
      ;
    s = ch;
    while (!isspace(ch = GETC())) s += ch;
    return *this;
  }
  Tp void read(T& x) {
    bool sign = 1;
    while ((ch = GETC())  0x2f) x = x * 0xa + (ch ^ 0x30);
    x = sign ? x : -x;
  }
  FILEIN& operator>>(int& x) { return read(x), *this; }
  // FILEIN& operator>>(signed& x) { return read(x), *this; }
  FILEIN& operator>>(unsigned& x) { return read(x), *this; }
} in;
struct FILEOUT {
  const static int LIMIT = 0x114514;
  char quq[SZ], ST[0x114];
  signed sz, O;
  ~FILEOUT() { flush(); }
  void flush() {
    fwrite(quq, 1, O, stdout);
    fflush(stdout);
    O = 0;
  }
  FILEOUT& operator LIMIT) flush();
    for (char c : str) quq[O++] = c;
    return *this;
  }
  Tp void write(T x) {
    if (O > LIMIT) flush();
    if (x  b;
struct Edge {
  int u, v, w;
} e[maxn];
struct Que {
  int op, x, y;
} Q[maxn];
struct Qry {
  int id, u, v, w;
  bool operator other.w;
    return id  qr;
struct DSU {
  int n, fa[maxn], sz[maxn], top, sta[maxn], stb[maxn];
  inline void reset(int _n) {
    n = _n, top = 0;
    for (int i = 1; i = l; i--) {
      if (Q[i].op == 1) {
        if (!vis[Q[i].x]) {
          vis[Q[i].x] = 1;
          if (Q[i].y >= x.w) {
            dsu.merge(e[Q[i].x].u, e[Q[i].x].v, 1);
          }
        }
      }
    }
    for (auto y : b) {
      if (!vis[y] && e[y].w >= x.w) {
        dsu.merge(e[y].u, e[y].v, 1);
      }
    }
    ans[x.id] = dsu.getsize(x.u);
    for (auto y : b) {
      vis[y] = 0;
    }
    dsu.reset();
  }
  for (int i = l; i > n >> m;
  for (int i = 1; i > u >> v >> w;
    e[i] = { u, v, w };
  }
  in >> num;
  len = 900;
  for (int i = 1; i > Q[i].op >> Q[i].x >> Q[i].y;
  }
  for (int i = 1; i 

P5443 [APIO2019]桥梁 [分块+并查集]

标签：ble   cpp   fine   ring   void   stat   false   null   sed   

原文地址：https://www.cnblogs.com/Isaunoya/p/12310916.html