Submission #1016361

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016361		May27_th	Vudu (COCI15_vudu)	C++17	140 / 140	519 ms	57152 KiB

vudu

#include<bits/stdc++.h>
using namespace std;
#define i64 long long
#define int64_t int
#define i128 __int128
#define mp make_pair
#define pb push_back
#define all(x) (x).begin(), (x).end()
struct Tree{
    int n;
    vector<int64_t>lazy;
    vector<int64_t>st;
    Tree(int _n, int64_t _v): n(_n), st(_n * 4, _v), lazy(_n * 4, _v){};
    void push(int id){
        int64_t add = lazy[id];
        lazy[id * 2] += add, st[id * 2] += add;
        lazy[id * 2 + 1] += add, st[id * 2 + 1] += add;
        lazy[id] = 0;
    }
    void update(int id, int l, int r, int u, int v, int64_t val){
        if (v < l || u > r) return;
        if (u <= l && r <= v) {
            st[id] += val;
            lazy[id] += val;
            return;
        }
        push(id);
        int mid = (l + r)/2;
        update(id * 2, l, mid, u, v, val);
        update(id * 2 + 1, mid + 1, r, u, v, val);
        st[id] = st[id * 2] + st[id * 2 + 1];
    }
    int get(int id, int l, int r, int u, int v) {
      if (v < l || u > r) return 0;
      if (u <= l && r <= v) return st[id];
      int mid = (l + r)/2;
      return get(id * 2, l, mid, u, v) + get(id * 2 + 1, mid + 1, r, u, v);
    }
    int find(int id, int l, int r, int u, int v){
        if (v < l || u > r) return 0;
        if (st[id] > 0) return 0;
        if (l == r) return l;
        push(id);
        int mid = (l + r)/2;
        int rg = find(id * 2 + 1, mid + 1, r, u, v);
        if (rg != 0) return rg;
        return find(id * 2, l, mid, u, v);
    }
};
void Solve(void) {
  int N; cin >> N;
  vector<i64> pref(N + 2, 0), compress;
  for (int i = 1; i <= N; i ++) cin >> pref[i];
  int P; cin >> P;
  for (int i = 1; i <= N; i ++) {
    pref[i] += pref[i - 1] - P;
    compress.pb(pref[i]);
  }
  sort(all(compress)); compress.erase(unique(all(compress)), compress.end());
  auto getPos = [&](i64 val) {
    return lower_bound(all(compress), val) - compress.begin() + 1;
  };
  int sz = compress.size();
  Tree T(sz + 2, 0);
  i64 ans = 0;
  for (int i = 1; i <= N; i ++) {
    int p = getPos(pref[i]);
    // cout << pref[i] << "\n";
    if (pref[i] >= 0) T.update(1, 1, sz, p, p, 1);
    ans = ans + T.get(1, 1, sz, 1, p);
    if (pref[i] < 0) T.update(1, 1, sz, p, p, 1);
    // cout << T.get(1, 1, sz, 1, p) << "\n";
  }
  cout << ans << "\n";
}
signed main() {
  ios_base::sync_with_stdio(false); cin.tie(0);
  cout << fixed << setprecision(10);
  int Tests = 1; // cin >> Tests;
  while (Tests --) {
    Solve();
  }
}

Compilation message (stderr)

vudu.cpp: In constructor 'Tree::Tree(int, int)':
vudu.cpp:12:20: warning: 'Tree::st' will be initialized after [-Wreorder]
   12 |     vector<int64_t>st;
      |                    ^~
vudu.cpp:11:20: warning:   'std::vector<int> Tree::lazy' [-Wreorder]
   11 |     vector<int64_t>lazy;
      |                    ^~~~
vudu.cpp:13:5: warning:   when initialized here [-Wreorder]
   13 |     Tree(int _n, int64_t _v): n(_n), st(_n * 4, _v), lazy(_n * 4, _v){};
      |     ^~~~

• Subtask 1: 140 / 140