Submission #1250123

#	Time	Username	Problem	Language	Result	Execution time	Memory
1250123		Zbyszek99	Souvenirs (IOI25_souvenirs)	C++20	100 / 100	12 ms	424 KiB

souvenirs

#include "souvenirs.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+9;

int cnt[101];
ll cost[101];

pair<vi,ll> ask(ll k)
{
    pair<vi,ll> a = transaction(k);
    forall(it,a.ff) cnt[it]++;
    return {a.ff,k-a.ss};
}

void solve(const pair<vi,ll>& ans, int l, int r)
{
    if(l > r) return;
    if(l == r)
    {
        cost[l] = ans.ss;
        forall(it,ans.ff)
        {
            if(it != l) cost[l] -= cost[it];
        } 
        return;
    }
    if(siz(ans.ff) == 1)
    {
        cost[l] = ans.ss;
        solve(ask(cost[l]-1),l+1,r);
        return;
    }
    ll avr = ans.ss;
    ll cnt2 = siz(ans.ff);
    forall(it,ans.ff)
    {
        if(it > r)
        {
            avr -= cost[it];
            cnt2--;
        }
    }
    avr = avr/cnt2;
    if(cnt2 > 1)
    {
        pair<vi,ll> avr_ans = ask(avr);
        int l2 = avr_ans.ff[0];
        if(siz(ans.ff) > 1)
        solve(avr_ans,l2,r);
        solve(ans,l,l2-1);
    }
    else 
    {
        cost[ans.ff[0]] = avr;
        if(ans.ff[0] != r) solve(ask(avr-1),ans.ff[0]+1,r);
        solve(ans,l,ans.ff[0]-1);
    }
}

void buy_souvenirs(int n, ll P0) 
{   
    pair<vi,ll> avr_ans = ask(P0-1);
    solve(avr_ans,1,n-1);
    for(int i = n-1; i >= 0; i--)
    {
        int add = (i-cnt[i]);
        rep(j,add)
        {
            transaction(cost[i]);
        }
    }
}   

• Subtask 0: 0 / 0
• Subtask 1: 4 / 4
• Subtask 2: 3 / 3
• Subtask 3: 14 / 14
• Subtask 4: 18 / 18
• Subtask 5: 28 / 28
• Subtask 6: 33 / 33