Submission #1255258

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255258		Tymond	Souvenirs (IOI25_souvenirs)	C++20	100 / 100	12 ms	424 KiB

souvenirs

#include <bits/stdc++.h>
#include "souvenirs.h"
#include <utility>
#include <vector>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::high_resolution_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

struct pair_hash{
  size_t operator()(const pair<int,int>&x)const{
    return hash<long long>()(((long long)x.first)^(((long long)x.second)<<32));
  }
};

//pair<vector<int>, long long> transaction(long long M){}
vi cnt;
vi known;
vll a;
int N;

//(ll)S / (i + 1) - ((S % (i + 1)) == 0)
ll getBound(int x, ll S){
    if(x == 1){
        return S;
    }

    return (ll)(S - x * (x - 1) / 2) / x;
}

void f(vi curr, ll S){
    //cerr << sz(curr) << ' ' << curr[0] << ' ' << S << '\n'; 
    if(sz(curr) == 1){
        known[curr[0]] = 1;
        a[curr[0]] = S;
        if(curr[0] == N - 1 || known[curr[0] + 1]){
            return;
        }
        //cerr << curr[0] << ' ' << S << '\n';
        pair<vi, ll> x = transaction(a[curr[0]] - 1);
        for(auto ele : x.fi){
            cnt[ele]++;
        }

        f(x.fi, a[curr[0]] - 1 - x.se);
        return;
    }

    for(int i = sz(curr) - 1; i >= 0; i--){
        if(i == 0){
            vi X = {curr[i]};
            f(X, S);
            continue;
        }
        if(known[curr[i]]){
            S -= a[curr[i]];
            continue;
        }

        ll B = getBound(i + 1, S);
        pair<vi, ll> x = transaction(B);
        for(auto ele : x.fi){
            cnt[ele]++;
        }

        f(x.fi, B - x.se);
        S -= a[curr[i]];
    }
}

void buy_souvenirs(int n, ll P0) {
    N = n;
    cnt.assign(N, 0);
    known.assign(N, 0);
    a.assign(N, -1);
    a[0] = P0;
    known[0] = 1;
    vi curr = {0};
    f(curr, P0);

    for(int i = 1; i < N; i++){
        while(cnt[i] < i){
            transaction(a[i]);
            cnt[i]++;
        }
    }
}

// int main(){
//     // ios_base::sync_with_stdio(0);
//     // cin.tie(NULL);
//     // cout.tie(NULL);

//     int t = 1;
//     cin >> t;
//     while(t--){
//         solve();
//     }

//     return 0;
// }

• 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