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  1. #include <bits/stdc++.h>
  2. #define ll int
  3. #define el "\n"
  4. #define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  5. #define __ROOT__ int main()
  6. #define fi first
  7. #define se second
  8. #define M 1000000007
  9. #define MAXN 1000001
  10. using namespace std;
  11.  
  12. ll n, q;
  13. ll arr[MAXN], sz[MAXN], par[MAXN], next_pos[MAXN];
  14.  
  15. ll find_set(ll a) {
  16.     if (a == par[a]) return a;
  17.     return par[a] = find_set(par[a]);
  18. }
  19.  
  20. void union_set(ll a, ll b) {
  21.     a = find_set(a);
  22.     b = find_set(b);
  23.     if (a == b) return;
  24.     if (sz[a] < sz[b]) swap(a, b);
  25.     par[b] = a;
  26.     sz[a] += sz[b];
  27. }
  28.  
  29. void init() {
  30.     cin >> n >> q;
  31.     for (ll i = 1; i <= n; i++) {
  32.         par[i] = i;
  33.         sz[i] = 1;
  34.         next_pos[i] = i + 1;
  35.     }
  36. }
  37.  
  38. void merge_range(ll x, ll y ){
  39. while(x<= y){
  40.     union_set(x,x+1) ;
  41.     ll t = x;
  42.     x = next_pos[x] ; // bỏ qua các vị trí đã hợp
  43.     next_pos[t] = y +1 ;
  44. }
  45. }
  46.  
  47. void solve() {
  48.     while (q--) {
  49.         ll t, x, y;
  50.         cin >> t >> x >> y;
  51.         if (t == 1) {
  52.             union_set(x, y);
  53.         } else if (t == 2) {
  54.             merge_range(x, y);
  55.         } else {
  56.             x = find_set(x);
  57.             y = find_set(y);
  58.             if (x == y) {
  59.                 cout << "YES" << el;
  60.             } else {
  61.                 cout << "NO" << el;
  62.             }
  63.         }
  64.     }
  65. }
  66.  
  67. __ROOT__ {
  68.     fast;
  69.     init();
  70.     solve();
  71. }
  72.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/OAaX8z
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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