Submission #1077840

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077840		steveonalex	Holiday (IOI14_holiday)	C++17	30 / 100	785 ms	4676 KiB

holiday

#include "holiday.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 FenwickTree{
    int n;
    vector<ll> a;

    FenwickTree(int _n){
        n = _n;
        a.resize(n+1);
    }

    void update(int i, ll v){
        while(i <= n){
            a[i] += v;
            i += LASTBIT(i);
        }
    }

    ll get(int i){
        ll ans = 0;
        while(i > 0){
            ans += a[i];
            i -= LASTBIT(i);
        }
        return ans;
    }

    int lower_bound(ll v){
        int p = MASK(logOf(n)), idx = 0;
        while(p > 0){
            if (idx + p < n && v > a[idx + p]){
                idx += p;
                v -= a[idx];
            }
            p >>= 1;
        }
        return idx + 1;
    }
};

ll what(int n, int s, int d, int a[], int l){
    vector<pair<int, int>> b(n);
    for(int i = 0; i<n; ++i) b[i] = {a[i], i};
    sort(ALL(b), greater<pair<int, int>>());


    vector<int> pos(n);
    for(int i = 0; i<n; ++i) pos[b[i].second] = i;

    ll ans = 0;
    for(int x = 0; x <= 1; ++x){
        FenwickTree bit(n), sum(n);
        for(int i = s + 1; i < n; ++i) {
            bit.update(pos[i] + 1, 1);
            sum.update(pos[i] + 1, a[i]);
        }
        int r = n-1;
        for(int i = s; i>=0; --i){
            bit.update(pos[i] + 1, 1);
            sum.update(pos[i] + 1, a[i]);

            int dis1 = s - i;
            int dis2 = l - dis1 * 2;
            if (dis2 < 0) break;
            while(r > s + dis2){
                bit.update(pos[r] + 1, -1);
                sum.update(pos[r] + 1, -a[r]);
                r--;
            }

            if (r < s) continue;

            maximize(ans, sum.get(bit.lower_bound(d - l)));
        }
        reverse(ALL(pos));
        reverse(a, a + n);
        s = n - s - 1;
    }
    return ans;
}

ll findMaxAttraction(int n, int start, int d, int a[]){
    ll ans = 0;
    // for(int i = 0; i<d; ++i) cout << what(n, start, d, a, i) << " "; cout << "\n";
    int l = 0, r = d - 1;
    while(r - l >= 3){
        int m1 = l + (r - l) / 3;
        int m2 = r - (r - l) / 3;

        ll v1 = what(n, start, d, a, m1);
        ll v2 = what(n, start, d, a, m2);
        if (v1 > v2) r = m2;
        else l = m1;
    }
    for(int i = l; i<=r; ++i) maximize(ans, what(n, start, d, a, i));
    return ans;
}

// int main(void){
//     ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
//     clock_t start = clock();

//     int n, s, d;
//     cin >> n >> s >> d;
//     int attraction[n];
//     for(int i = 0; i<n; ++i) cin >> attraction[i];

//     cout << findMaxAttraction(n, s, d, attraction) << "\n";

//     cerr << "Time elapsed: " << clock() - start << " ms\n";
//     return 0;
// }

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 0 / 17
• Subtask 4: 0 / 53