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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #include <ext/pb_ds/assoc_container.hpp>
  5. using namespace __gnu_pbds;
  6.  
  7. typedef long long ll;
  8. random_device rd;
  9. mt19937 rng(0);
  10. uniform_int_distribution<ll> uni(1, 1e9);
  11. typedef pair<ll, ll> pii;
  12.  
  13. const ll rdseed = (uint64_t)(make_unique<char>().get()) ^ chrono::high_resolution_clock::now().time_since_epoch().count();
  14.  
  15. unsigned hash_f(unsigned x) {
  16.     x = ((x >> 16) ^ x) * 0x45d9f3b;
  17.     x = ((x >> 16) ^ x) * 0x45d9f3b;
  18.     x = (x >> 16) ^ x;
  19.     return x;
  20. }
  21.  
  22. struct chash {
  23.     ll operator()(ll x) const { return hash_f(x); }
  24. };
  25.  
  26. const ll N = 1e18;
  27. const ll NUM_ELEM = 2e5;
  28. const ll NUM_QUERIES = 2e5;
  29. struct Node {
  30.     Node *lp, *rp;
  31.     ll sum;
  32. };
  33. inline ll eval(Node *p) { return p ? p->sum : 0LL; }
  34.  
  35. const ll bufSize = NUM_ELEM * 31;
  36. Node buf[bufSize];
  37. Node *newNode() {
  38.     static auto ptr = buf;
  39.     return ptr++;
  40. }
  41.  
  42. ll getSum(Node *cur, ll l, ll r, ll x, ll y) {
  43.     if (!cur || x > r || y < l)
  44.         return 0;
  45.     if (x <= l && r <= y) {
  46.         return cur->sum;
  47.     }
  48.     ll m = (l + r) / 2;
  49.     return getSum(cur->lp, l, m, x, y) + getSum(cur->rp, m + 1, r, x, y);
  50. }
  51. void update(Node *&cur, ll l, ll r, ll pos, ll val) {
  52.     if (!cur)
  53.         cur = newNode();
  54.     if (l == r) {
  55.         cur->sum = val;
  56.     } else {
  57.         ll m = (l + r) / 2;
  58.         if (pos <= m) {
  59.             update(cur->lp, l, m, pos, val);
  60.         } else {
  61.             update(cur->rp, m + 1, r, pos, val);
  62.         }
  63.         cur->sum = eval(cur->lp) + eval(cur->rp);
  64.     }
  65. }
  66. Node *root;
  67.  
  68. gp_hash_table<ll, ll, chash> seg;
  69.  
  70. ll get(ll x) {
  71.     auto res = seg.find(x);
  72.     return (res == seg.end()) ? 0 : res->second;
  73.     // return (seg.find(x) == seg.end()) ? 0 : seg[x];
  74. }
  75. void modify(ll p, ll val) {
  76.     for (seg[p += N] = val; p > 0; p >>= 1) {
  77.         seg[p >> 1] = get(p) + get(p ^ 1);
  78.     }
  79. }
  80.  
  81. ll query(ll l, ll r) {
  82.     ll res = 0;
  83.     for (l += N, r += N; l < r; l >>= 1, r >>= 1) {
  84.         if (l & 1)
  85.             res += get(l++);
  86.         if (r & 1)
  87.             res += get(--r);
  88.     }
  89.     return res;
  90. }
  91.  
  92. signed main() {
  93.     ios::sync_with_stdio(0);
  94.     cin.tie(0);
  95.     vector<pii> elems;
  96.     for (ll i = 0; i < NUM_ELEM; i++) {
  97.         elems.push_back({uni(rng), uni(rng)});
  98.     }
  99.     vector<pii> queries;
  100.     for (ll i = 0; i < NUM_QUERIES; i++) {
  101.         ll a = uni(rng), b = uni(rng);
  102.         if (a > b)
  103.             swap(a, b);
  104.         queries.push_back({a, b});
  105.     }
  106.     vector<ll> ans1, ans2;
  107.     clock_t begin;
  108.     Node *rmq = newNode();
  109.     begin = clock();
  110.     for (auto i : elems) {
  111.         modify(i.first, i.second);
  112.     }
  113.     for (auto i : queries) {
  114.         ans2.push_back(query(i.first, i.second + 1));
  115.     }
  116.     cout << "policy hash: " << (double)(clock() - begin) / CLOCKS_PER_SEC << endl;
  117.     seg.clear();
  118.  
  119.     begin = clock();
  120.     for (auto i : elems) {
  121.         update(root, 1, N, i.first, i.second);
  122.     }
  123.     for (auto i : queries) {
  124.         ans1.push_back(getSum(root, 1, N, i.first, i.second));
  125.     }
  126.     cout << "pointer: " << (double)(clock() - begin) / CLOCKS_PER_SEC << endl;
  127.     for (ll i = 0; i < ans1.size(); i++) {
  128.         assert(ans1[i] == ans2[i]);
  129.     }
  130. }
Success #stdin #stdout 1.15s 166848KB
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policy hash: 0.716413
pointer: 0.335393
https://ideone.com/sze6wg
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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