Submission #1084217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084217		steveonalex	Distributing Candies (IOI21_candies)	C++17	100 / 100	677 ms	44716 KiB

candies

 #include "candies.h"
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

struct SegmentTree{
    struct Node{
        ll l, r, lazy;
        Node(){l = r = lazy = 0;}
    };

    int n;
    vector<Node> a;

    SegmentTree(int _n){
        n = _n;
        a.resize(n * 4 + 8);
    }

    void update_node(int i, ll v){
        a[i].l += v; a[i].r += v; a[i].lazy += v;
    }

    void merge_child(int id){
        a[id].l = min(a[id * 2].l, a[id * 2 + 1].l);
        a[id].r = max(a[id * 2].r, a[id * 2 + 1].r);
    }

    void down(int id){
        update_node(id * 2, a[id].lazy); update_node(id * 2 + 1, a[id].lazy);
        a[id].lazy = 0;
    }

    void update(int u, int v, int val, int l, int r, int id){
        if (u <= l && r <= v){
            update_node(id, val);
            return;
        }
        if (a[id].lazy) down(id);
        int mid = (l + r) >> 1;
        if (u <= mid) update(u, v, val, l, mid, id * 2);
        if (v > mid) update(u, v, val, mid + 1, r, id * 2 + 1);
        merge_child(id);
    }

    void update(int u, int v, int val){
        update(u, v, val, 0, n, 1);
    }

    pair<ll, ll> combine_range(pair<ll, ll> a, pair<ll, ll> b){
        return make_pair(min(a.first, b.first), max(a.second, b.second));
    }

    pair<ll, ll> get(int u, int v, int l, int r, int id){
        if (u <= l && r <= v) return make_pair(a[id].l, a[id].r);
        if (a[id].lazy) down(id);
        int mid = (l + r) >> 1;
        pair<ll, ll> ans = {1e18, -1e18};
        if (u <= mid) ans = combine_range(ans, get(u, v, l, mid, id * 2));
        if (v > mid) ans = combine_range(ans, get(u, v, mid + 1, r, id * 2 + 1));
        return ans;
    }

    pair<ll, ll> get(int u, int v){
        return get(u, v, 0, n, 1);
    }
};

vector<int> distribute_candies(vector<int> c, vector<int> l,
                                    vector<int> r, vector<int> v) {
    int n = c.size(), q = l.size();
    SegmentTree st(q);
    vector<vector<pair<int, int>>> queries(n+1);
    for(int i = 0; i<q; ++i){
        queries[l[i]].push_back({i + 1, v[i]});
        queries[r[i]+1].push_back({i + 1, -v[i]});
    }

    vector<int> a(n);
    ll sum = 0;
    for(int i = 0; i<n; ++i){
        for(pair<int, int> j: queries[i]){
            st.update(j.first, q, j.second);
            sum += j.second;
        }
        pair<ll, ll> cur = st.get(0, q);
        // if (i == n-1){
        //     cout << cur.first << " " << cur.second << "\n";
        // }
        if (cur.second - cur.first <= c[i]){
            a[i] = sum - cur.first;
        }
        else{
            int l = 1, r = q;
            while(l < r){
                int mid = (l + r) >> 1;
                pair<ll, ll> cur = st.get(mid, q);
                if (cur.second - cur.first <= c[i]) r = mid;
                else l = mid + 1;
            }
            pair<ll, ll> cur = st.get(l, q);
            int x = l - 1;
            if (v[x] > 0){
                a[i] = c[i] - (cur.second - sum);
            }
            else a[i] = sum - cur.first;
        }
    }

    return a;
}

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