Submission #257306

#	Time	Username	Problem	Language	Result	Execution time	Memory
257306		wiwiho	Cave (IOI13_cave)	C++14	100 / 100	370 ms	632 KiB

cave

//#define NDEBUG

#include "cave.h"

#include <bits/stdc++.h>
#include <bits/extc++.h>

#define StarBurstStream ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define iter(a) a.begin(), a.end()
#define riter(a) a.rbegin(), a.rend()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(riter(a))
#define pb(a) push_back(a)
#define eb(a) emplace_back(a)
#define pf(a) push_front(a)
#define pob pop_back()
#define pof pop_front()
#define mp(a, b) make_pair(a, b)
#define F first
#define S second
#define mt make_tuple
#define gt(t, i) get<i>(t)
#define iceil(a, b) ((a + b - 1) / b)
#define tomax(a, b) (a = max(a, b))
#define printv(a, b) {bool pvaspace=false; \
for(auto pva : a){ \
    if(pvaspace) b << " "; pvaspace=true;\
    b << pva;\
}\
b << "\n";}

//#define TEST

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<ld, ld>;
using tiii = tuple<int, int, int>;

const ll MOD = 1000000007;
const ll MAX = 2147483647;

template<typename A, typename B>
ostream& operator<<(ostream& o, pair<A, B> p){
    return o << '(' << p.F << ',' << p.S << ')';
}

bool check(vector<int>& pos, int l, int r, int* q, int t, int n){
    for(int i = l; i <= r; i++) q[pos[i]] = !q[pos[i]];
    int qr = tryCombination(q);
    bool ans = qr > t || qr == -1;
//    cerr << l << " " << r << " " << t << " " << qr << "\n";
//    printv(vector<int>(q, q + n), cerr);
    for(int i = l; i <= r; i++) q[pos[i]] = !q[pos[i]];
//    cerr << ans << "\n";
    return ans;
}

void exploreCave(int n){

    int q[n];
    fill(q, q + n, 0);

    int s[n], d[n];
    fill(s, s + n, -1);
    fill(d, d + n, -1);

    for(int i = 0; i < n; i++){

        vector<int> pos;
        int qr = tryCombination(q);
//        cerr << "test " << i << " " << qr << "\n";
        if(qr != i){
            for(int j = 0; j < n; j++){
                if(s[j] == -1){
                    q[j] = !q[j];
                }
            }
        }
        for(int j = 0; j < n; j++){
            if(s[j] == -1) pos.eb(j);
        }

        int l = 0, r = pos.size() - 1;
        while(l < r){
            int m = (l + r) / 2;
            if(check(pos, l, m, q, i, n)) r = m;
            else l = m + 1;
        }

        s[pos[l]] = q[pos[l]] = !q[pos[l]];
        d[pos[l]] = i;
    }

    answer(s, d);

}

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