Submission #578918

#	Time	Username	Problem	Language	Result	Execution time	Memory
578918		Belgutei	Cave (IOI13_cave)	C++17	0 / 100	135 ms	488 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ff first
#define ss second
#define pb push_back
#define mk make_pair

int l,r;
vector<int> v;
vector<int> :: iterator it;

void exploreCave(int N) {
    int x[N];
    int a[N];
    int tp[N];
    int ans[N];
    memset(a, 0, sizeof(a));
    //
    for(int i = 0; i < N; i ++) {
        v.pb(i);
    }
    //
    int ok = 0;
    int tur = tryCombination(a);
    if(tur >= 1) ok = 1;
    memset(tp, -1, sizeof(tp));
    //
    for(int i = 0; i < N; i ++) { // we are looking for i-th door
        l = 0;
        r = v.size() - 1;
        int tmp;
        while(l < r) {
            int mid = (l + r) / 2;
            // cout << l << ' ' << r << ' ' << mid << '\n';
            // cout << "OK: " << ok << '\n';
            for(int j = l; j <= mid; j ++) {
                a[v[j]] = 1 - a[v[j]];
            }
            tmp = tryCombination(a);
            // for(int j = 0; j < N; j ++) {
            //     cout << a[j] << ' ';
            // }
            // cout << '\n';

            if(tmp == -1) tmp = N;
            //cout << "TMP: " << tmp << '\n';
            if(tmp > i && ok == 0) {
                r = mid;
                ok = 1;
            }
            else if(tmp > i && ok == 1) {
                l = mid + 1;
                ok = 1;
            }
            else if(ok == 1) {
                r = mid;
                ok = 0;
            }
            else {
                l = mid + 1;
                ok = 0;
            }
            //
            if(l == r) {
                // cout << "POS: " << v[l] << '\n'; 
                // cout << "WTF " << ok << '\n';
                if(ok == 0) {
                    a[v[l]] = 1 - a[v[l]];
                }
                tp[v[l]] = a[v[l]];
                tmp = tryCombination(a);
                if(tmp == -1) tmp = N;
                if(tmp > i + 1) ok = 1;
                else ok = 0;
            }
        }
        ans[v[l]] = i;
        if(tp[v[l]] == -1) {
            if(ok == 0) tp[v[l]] = 1 - a[v[l]];
            else tp[v[l]] = a[v[l]];
        }
        it = lower_bound(v.begin(), v.end(), v[l]);
        v.erase(it);
        // cout << "IN the V: ";
        // for(int j = 0; j < v.size(); j ++) {
        //     cout << v[j] << ' ';
        // }
        // cout << '\n';
        // cout << "OK: " << ok << '\n';
        // for(int j = 0; j < N; j ++) {
        //     cout << a[j] << ' ';
        // }
        // cout << "\n\n";
    }
    answer(tp, ans);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:17:9: warning: unused variable 'x' [-Wunused-variable]
   17 |     int x[N];
      |         ^

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24