Submission #723410

#	Time	Username	Problem	Language	Result	Execution time	Memory
723410		coloboxx	Distributing Candies (IOI21_candies)	C++17	29 / 100	134 ms	20796 KiB

candies

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("avx,avx2,sse2,sse3,ssse3,sse4,lzcnt,popcnt")

#include <bits/stdc++.h>
#include "candies.h"
#include <ext/pb_ds/assoc_container.hpp>

#define ll long long
#define point pair<int, int>
#define X first
#define Y second
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define show(x) cerr << (#x) << " = " << x << '\n'
#define print(x) if (1) {cerr << (#x) << " = "; for (auto it : x) \
      cerr << it << ' '; cerr << '\n';}
#define fast_io ios_base::sync_with_stdio(0), cin.tie(0)

const int N = 1 << 19;
const int S = 5e6 + 64;
const int INF = 2e9 + 64;
const ll MAX = 2e18 + 64;
const int LOG = 25;
const int MOD = 1e9 + 7; //998244353;
const int P = 79;
const int B = 800;

using namespace std;
using namespace __gnu_pbds;

vector<int> distribute_candies(vector<int> c, vector<int> l, vector<int> r, vector<int> v) {
      int n = c.size();
      int q = v.size();

      vector<point> a(n);
      for (int i = 0; i < n; ++i)
            a[i] = {c[i], i};

      sort(all(a));

      vector<ll> pref(q), suf(q);
      pref.front() = v.front(), suf.back() = v.back();

      for (int i = 1; i < q; ++i)
            pref[i] = pref[i - 1] + v[i];

      for (int i = q - 2; i >= 0; --i)
            suf[i] = suf[i + 1] + v[i];
      suf.pb(0);

      vector<ll> mn(q), mx(q);
      mn[q - 1] = mx[q - 1] = pref[q - 1];

      for (int i = q - 2; i >= 0; --i)
            mn[i] = min(mn[i + 1], pref[i]), mx[i] = max(mx[i + 1], pref[i]);

      vector<int> w(n), ans(n);
      int j = -1;

      for (int i = n - 1; i >= 0; --i) {
            if (i + 1 < n)
                  w[i] = min(a[i].X, w[i + 1]);

            assert(w[i] >= 0 && w[i] <= a[i].X);
            //show(j);

            while ((j + 1 < q) && ((mx[j + 1] - (j >= 0 ? pref[j] : 0) + w[i] >= a[i].X) 
                  || (mn[j + 1] - (j >= 0 ? pref[j] : 0) + w[i] <= 0))) {

                  ++j;
                  w[i] += v[j];
                  w[i] = max(0, min(a[i].X, w[i]));
            }
            //show(i), show(j), show(w[i]);
            ans[a[i].Y] = w[i] + suf[j + 1];
      }

      return ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 8
• Subtask 3: 0 / 27
• Subtask 4: 29 / 29
• Subtask 5: 0 / 33