Submission #1096559

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096559		Tymond	Gondola (IOI14_gondola)	C++17	60 / 100	29 ms	6096 KiB

gondola

#include <bits/stdc++.h>
#include "gondola.h"
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);
    }
};

int valid(int n, int inputSeq[]){
    vi a;
    vi vec;
    map<int, int> cnt;
    pii mn = {10000000, 0};
    for(int i = 0; i < n; i++){
        a.pb(inputSeq[i]);
        cnt[a[i]]++;
        if(a[i] < mn.fi){
            mn.fi = a[i];
            mn.se = i;
        }
    }

    for(auto ele : cnt){
        if(ele.se > 1){
            return 0;
        }
    }

    vi na;
    for(int i = mn.se; i < n; i++){
        na.pb(a[i]);
    }
    for(int i = 0; i < mn.se; i++){
        na.pb(a[i]);
    }
    a = na;
    for(int i = 0; i < n; i++){
        if(a[i] <= n){
            vec.pb(i);
        }
    }

    if(sz(vec) <= 1){
        return 1;
    }

    for(int i = 0; i + 1 < sz(vec); i++){
        if(a[vec[i + 1]] <= a[vec[i]]){
            return 0;
        }

        if(vec[i + 1] - vec[i] != a[vec[i + 1]] - a[vec[i]]){
            return 0;
        }
    }

    if(n - vec.back() - 1 != (n - a[vec.back()] + a[vec[0]] - 1)){
        return 0;
    }
    return 1;
}

//----------------------
const int INF = 1e9;

int replacement(int n, int gondolaSeq[], int replacementSeq[]){
    int l = 0;
    vi a;
    set<pii> x;
    pii mn = {INF, 0};
    for(int i = 0; i < n; i++){
        a.pb(gondolaSeq[i]);
        if(a[i] > n){
            x.insert({a[i], i});
        }
        
        if(a[i] < mn.fi){
            mn.fi = a[i];
            mn.se = i;
        }
    }

    vi p;
    int ok = n + 1;
   // cout << mn.fi << ' ' << mn.se << '\n';
    while(sz(x)){
        pii akt = *(x.begin());
        x.erase(x.begin());

        int our;
        if(mn.fi > n){
            our = akt.se + 1;
        }else if(akt.se >= mn.se){
            our = mn.fi + akt.se - mn.se;
            if(our > n){
                our -= n;
            }
        }else{
            our = mn.fi + n - mn.se + akt.se;
            while(our > n){
                our -= n;
            }
        }
        //cout << akt.se << ' ' << our << '\n';
        p.pb(our);
        our = ok;
        while(our < akt.fi){
            p.pb(our);
            our++;
        }

        ok = our + 1;
    }

    l = sz(p);
    for(int i = 0; i < l; i++){
        replacementSeq[i] = p[i];
    }
    return l;
}

//----------------------

const int MOD = 1e9 + 7;
int countReplacement(int n, int inputSeq[]){
    if(!valid(n, inputSeq)){
        return 0;
    }

    vi a;
    pii mn = {INF, 0};
    for(int i = 0; i < n; i++){
        a.pb(inputSeq[i]);
        if(a[i] < mn.fi){
            mn.fi = a[i];
            mn.se = i;
        }
    }

    ll ans = 1LL;
    if(mn.fi > n){
        ans = n;
    }

    set<pii> s;
    for(int i = 0; i < n; i++){
        if(a[i] > n){
            s.insert({a[i], i});
        }
    }

    int u = n + 1;
    while(sz(s)){
        pii akt = *s.begin();
        s.erase(s.begin());
        
        while(u < akt.fi){
            ans = (ll)ans * (sz(s) +1);
            ans %= MOD;
            u++;
        }
        u++;
    }

    return (int)ans;
}

/*int main(){
    int S[2] = {3, 4};
    cout<<countReplacement(2, S) << '\n';
    return 0;
}*/

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 5 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10