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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int MAXN = 2e5 + 5;
  4. const int LG = 30;
  5. int n, q;
  6. int a[MAXN];
  7.  
  8. int H[MAXN * LG];
  9. long long st[MAXN * LG];
  10. int L[MAXN * LG], R[MAXN * LG];
  11. int node = 0;
  12.  
  13. int up(int old, int l, int r, int pos, int val){
  14.     int cur = ++ node;
  15.     if(l == r){
  16.         st[cur] = val;
  17.         return cur;
  18.     }
  19.     int mid = l + r >> 1;
  20.     if(pos <= mid){
  21.         R[cur] = R[old];
  22.         L[cur] = up(L[old], l, mid, pos, val);
  23.     } else{
  24.         L[cur] = L[old];
  25.         R[cur] = up(R[old], mid + 1, r, pos, val);
  26.     }
  27.     st[cur] = st[L[cur]] + st[R[cur]];
  28.     return cur;
  29. }
  30.  
  31. long long get(int id, int l, int r, int u, int v){
  32.     if(l > v || r < u) return 0;
  33.     if(l >= u && r <= v) return st[id];
  34.     int mid = l + r >> 1;
  35.     return get(L[id], l, mid, u, v) + get(R[id], mid + 1, r, u, v);
  36. }
  37.  
  38. signed main(){
  39.     ios_base::sync_with_stdio(false);
  40.     cin.tie(nullptr);
  41.  
  42.     cin >> n >> q;
  43.     for(int i = 1; i <= n; i++) cin >> a[i];
  44.  
  45.     for(int i = 1; i <= n; i++){
  46.         H[1] = up(H[1], 1, n, i, a[i]);
  47.     }
  48.     int vers = 1;
  49.  
  50.     while(q--){
  51.         int t; cin >> t;
  52.         if(t == 1){
  53.             int id, val, x; cin >> x >> id >> val;
  54.             H[x] = up(H[x], 1, n, id, val);
  55.         }
  56.         if(t == 2){
  57.             int k, l, r; cin >> k >> l >> r;
  58.             cout << get(H[k], 1, n, l, r) << "\n";
  59.         }
  60.         if(t == 3){
  61.             int k; cin >> k;
  62.             H[vers + 1] = H[k];
  63.             vers++;
  64.         }
  65.     }
  66.  
  67.     return 0;
  68. }
  69. /*
  70. 5 6
  71. 2 3 1 2 5
  72. 3 1
  73. 2 1 1 5
  74. 2 2 1 5
  75. 1 2 2 5
  76. 2 1 1 5
  77. 2 2 1 5
  78. */
  79.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/4zfae2
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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