Submission #402678

#	Time	Username	Problem	Language	Result	Execution time	Memory
402678		ACmachine	Cave (IOI13_cave)	C++17	100 / 100	1121 ms	456 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)

const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;

template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "[";  REP(i, U) out << v[i] << ", ";  out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}

template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }


void exploreCave(int n) {
    vector<int> s(n); // correct stav switchu
    vector<int> d(n); // ku ktoremu switchu je door i; Potom sprav inverse permutaciu!!!
    auto solve = [&](int ind){
        vector<int> f(n, 1);
        auto fix = [&](){
            REP(i, ind){
                f[d[i]] = s[d[i]];
            }
        };
        auto go = [&](){
            int *p = &f[0];
            return tryCombination(p);
        };
        auto get_state = [&](){
            int res = go();
            int state = ((res > ind || res == -1) ? 1 : 0);
            return state;
        };
        fix();
        int state = get_state();
        int l = 0;
        int r = n;
        while((r - l) > 1){
            int mid = (l + r) >> 1;
            REP(i, n){
                if(i >= l && i < mid)
                    f[i] = 0;
                else
                    f[i] = 1;
            }
            fix();
            int nstate = get_state();
            if(nstate == state){
                l = mid;
            }
            else{
                r = mid;
            }
        }
        d[ind] = l;
        if(state == 1)
            s[l] = 1;
        else
            s[l] = 0;
    };
    REP(i, n)
        solve(i);
    vector<int> inverse_d(n);
    REP(i, n){
        inverse_d[d[i]] = i;
    }
    int* p0 = &s[0];
    int* p1 = &inverse_d[0];
    answer(p0, p1);
}

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24