Submission #342284

#	Time	Username	Problem	Language	Result	Execution time	Memory
342284		DrearyJoke	Cave (IOI13_cave)	C++17	100 / 100	307 ms	640 KiB

cave

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include "cave.h"
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;
typedef vector<bool> vb;
typedef tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;

template <typename T, typename U> std::istream&operator>>(std::istream&i, pair<T,U>&p) {i >> p.x >> p.y; return i;}
template<typename T>std::istream&operator>>(std::istream&i,vector<T>&t) {for(auto&v:t){i>>v;}return i;}
template <typename T, typename U> std::ostream&operator<<(std::ostream&o, const pair<T,U>&p) {o << p.x << ' ' << p.y; return o;}
template<typename T>std::ostream&operator<<(std::ostream&o,const vector<T>&t) {if(t.empty())o<<'\n';for(size_t i=0;i<t.size();++i){o<<t[i]<<" \n"[i == t.size()-1];}return o;}

#define deb(x) cout << '>' << #x << ':' << x << endl;
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define END '\n'
#define inf 9e18
#define ff first
#define ss second
#define pb push_back

int nn;

void toggle(int S[], int done[], int l, int r) {
    for (int i = l; i <= r; ++i) {
        if (done[i] == -1) S[i] ^= 1;
    }
}
bool open_glob;

void rec(int l, int r, int idx, int S[], int done[], bool open) {
    if (r == l) {
        // cout << l << " WOW " << idx << END;
        done[l] = idx;
        if (!open) S[l] ^= 1;
        int cur = tryCombination(S);
        if (cur == idx + 1) open_glob = false;
        else open_glob = true;
        // cout << "DONE ARRAY: ";
        // for (int i = 0; i < nn; ++i) cout << done[i] << " ";
        // cout << END;
        return;
    }
    // int cur = tryCombination(S);
    // bool open = false;
    // if (cur > idx || cur == -1) open = true;
    // // cout << idx << " " << l << " " << r << " " << cur << " " << open << ":\n";
    // // for (int i = 0; i < nn; ++i) cout << S[i] << " ";
    // // cout << END;
    int mid = (l + r) >> 1;
    toggle(S, done, l, mid);
    int nxt = tryCombination(S);
    bool topen = false;
    if (nxt > idx || nxt == -1) topen = true;
    // cout << idx << " " << l << " " << r << " " << nxt << " " << topen << ":\n";
    // for (int i = 0; i < nn; ++i) cout << S[i] << " ";
    // cout << END;
    if (open == topen) rec(mid + 1, r, idx, S, done, topen);
    else rec(l, mid, idx, S, done, topen);
}

void exploreCave(int n) {
    nn = n;
    int S[n] = {0}, D[n] = {-1};
    for (int i = 0; i < n; ++i) S[i] = 0, D[i] = -1;
    // bool open = false;
    int cur = tryCombination(S);
    if (cur != 0) open_glob = true;
    else open_glob = false;
    for (int i = 0; i < n; ++i) {
        rec(0, n - 1, i, S, D, open_glob);
    }
    // for (int i = 0; i < n; ++i) cout << D[i] << " ";
    // cout << END;
    answer(S, D);
}

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