Submission #989342

#	Time	Username	Problem	Language	Result	Execution time	Memory
989342		steveonalex	Mechanical Doll (IOI18_doll)	C++17	70.67 / 100	159 ms	26164 KiB

doll

#include <bits/stdc++.h>
#include "doll.h"
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : 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);}
 
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());
    }
 
void create_circuit(int m, vector<int> a);
namespace Grader{
    int n, m;
    vector<int> a;
    void answer(vector<int> C, vector<int> X, vector<int> Y){
        cout << n << "\n";
 
        if (X.size() > n * 2) {
            cout << "Wrong answer! (switch limit exceeded)\n";
            exit(1);
        } 
 
        cout << "Validating...\n";
        int ball = 0;
        vector<int> ans;
        vector<bool> state(X.size());
        while(ball != 0 || ans.empty()){
            // cout << "Ball: " << ball << endl;
            if (ball > 0) ans.push_back(ball);
            if (ball >= 0){
                ball = C[ball];
            }
            else {
                int cur = (-ball) - 1;
                if (state[cur]){
                    state[cur] = false;
                    ball = Y[cur];
                }
                else{
                    state[cur] = true;
                    ball = X[cur];
                }
            }
        }
 
        if (ans != a) cout << "Wrong answer! (incorrect sequence produced)\n";
        else if (*max_element(ALL(state)) == 1) cout << "Wrong answer! (there exists an Y switch)\n";
        else {
            cout << "Correct answer!\n";
            cout << "Switch used: " << X.size() << "\n";
            return;
        }
        exit(1);
    }
 
    void solve(){
        // cin >> n >> m;
        n = rngesus(1, 1024), m = rngesus(1, 1024);
        a = vector<int>(n);
        for(int i = 0; i<n; ++i) a[i] = rngesus(1, m);
 
        create_circuit(m, a);
    }
 
}
 
// using namespace Grader;
 
void toss(vector<int> &a){
    int n = a.size();
    vector<int> st(n*2);
 
    for(int i: a){
        int idx = 1;
        while(idx < n){
            if (!st[idx]){
                st[idx] = 1;
                idx = idx * 2;
            }
            else{
                st[idx] = 0;
                idx = idx * 2 + 1;
            }
        }
        st[idx] = i;
    }
 
    for(int i = n; i<n*2; ++i) a[i-n] = st[i];
}
 
void create_circuit(int m, vector<int> a) {
    vector<int> C(m+1, 0);
    vector<int> X, Y;
 
    int n = a.size();
    for(int i = 1; i<=m; ++i) C[i] = -1;
    C[0] = a[0];
 
    a.erase(a.begin());

 
    int k = MASK(logOf(a.size()) + 1);
    vector<int> perm(k);
    for(int i = 0; i<k; ++i) perm[i] = i;
    a.push_back(0);
    n = a.size();

    toss(perm);

    vector<int> b;
    for(int i = k-n; i < k; ++i) b.push_back(perm[i]);
    sort(ALL(b));
    map<int, int> mp;
    for(int i = 0; i<b.size(); ++i)
        mp[b[i]] = a[i];

    vector<int> kus(k, -1);
    for(int i = k-n; i<k; ++i) kus[i] = mp[perm[i]];

    int cur = 0;
    vector<int> mariana(k);
    for(int j: kus) mariana.push_back(j);
    mariana[1] = --cur;

    vector<int> check(mariana.size());
    for(int i = 1; i<k*2; ++i) if (mariana[i] == -1) check[i] = 1;
    int ma = 0;
    for(int i = k-1; i>=1; --i) {
        if (check[i * 2] && check[i * 2 + 1]){
            check[i] = check[i * 2] + 1;
        }
        maximize(ma, check[i]);
    }

    for(int j = 1; j < ma; ++j){
        cur--;
        X.push_back(cur+1); Y.push_back(cur+1);
    }

    for(int i = 2; i<k; ++i){
        if (check[i] == 0){
            mariana[i] = --cur;
        }
        else mariana[i] = -check[i];
    }

    while(X.size() < -cur){
        X.push_back(0);
        Y.push_back(0);
    }

    for(int i = 1; i<k; ++i){
        int pos = -mariana[i] - 1;
        X[pos] = mariana[i * 2];
        Y[pos] = mariana[i * 2 + 1];
    }

    
    answer(C, X, Y);
}
 
 
// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
//     int t; cin >> t;
//     for(int iteration = 1; iteration <= t; ++iteration)
//     solve();
 
//     return 0;
// }

Compilation message (stderr)

doll.cpp: In function 'void Grader::answer(std::vector<int>, std::vector<int>, std::vector<int>)':
doll.cpp:55:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   55 |         if (X.size() > n * 2) {
      |             ~~~~~~~~~^~~~~~~
doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:151:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  151 |     for(int i = 0; i<b.size(); ++i)
      |                    ~^~~~~~~~~
doll.cpp:184:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  184 |     while(X.size() < -cur){
      |           ~~~~~~~~~^~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 14.7580402392 / 18
• Subtask 6: 45.9139029664 / 56