Submission #1071822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1071822		Mihailo	Longest Trip (IOI23_longesttrip)	C++17	0 / 100	229 ms	344 KiB

longesttrip

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pll pair<long long, long long>
#define MOD 1000000007ll
#define xx first
#define yy second
using namespace std;
typedef long long ll;
mt19937 mt(169);

bool are_connected(vector<int> A, vector<int> B);

vector<int> sh;

bool query(vector<int> a, vector<int> b) {
    vector<int> A, B;
    for(int i=0; i<a.size(); i++) A.pb(sh[a[i]]);
    for(int i=0; i<b.size(); i++) B.pb(sh[b[i]]);
    /*for(int i:a) cout<<i<<' ';
    cout<<'\n';
    for(int i:b) cout<<i<<' ';
    cout<<'\n';*/
    return are_connected(A, B);
}

int cur, zadnji, sled;
bool nema;
vector<int> put, klika;

int ko(int jedan, vector<int> vise, int l, int r) {
    vector<int> a, b;
    a.pb(jedan);
    int m=(l+r)/2;
    for(int i=l; i<=m; i++) b.pb(vise[i]);
    if(query(a, b)) return ko(jedan, vise, l, m);
    else return ko(jedan, vise, m+1, r);
}

vector<int> vrati(vector<int> v) {
    vector<int> rez;
    for(int i:v) rez.pb(sh[i]);
    return rez;
}

vector<int> longest_trip(int N, int D) {
    sh.clear();
    for(int i=0; i<N; i++) sh.pb(i);
    shuffle(sh.begin(), sh.end(), mt);
    cur=0;
    zadnji=0;
    klika.clear();
    put.clear();
    put.pb(0);
    vector<int> a, b;
    while(zadnji<N-1) {
        a.clear();
        b.clear();
        if(klika.empty()) {
            a.pb(cur);
            b.pb(zadnji+1);
            if(query(a, b)) {
                cur=zadnji+1;
                put.pb(cur);
                zadnji=max(cur, zadnji);
                continue;
            }
            klika.pb(zadnji+1);
            zadnji=max(zadnji, klika.back());
            nema=true;
        }
        else {
            sled=zadnji+1;
            if(nema) {
                a.pb(cur);
                b.pb(sled);
                if(query(a, b)) {
                    cur=sled;
                    put.pb(cur);
                    zadnji=max(cur, zadnji);
                    nema=false;
                }
                else {
                    klika.pb(sled);
                    zadnji=max(klika.back(), zadnji);
                }
                continue;
            }
            a.pb(cur);
            a.pb(sled);
            if(query(a, klika)) {
                a.pop_back();
                if(!query(a, klika)) {
                    cur=sled;
                    put.pb(cur);
                    zadnji=max(cur, zadnji);
                }
                sled=ko(cur, klika, 0, klika.size()-1);
                put.pb(sled);
                for(int i:klika) {
                    if(i!=sled) {
                        put.pb(i);
                        cur=i;
                    }
                }
                klika.clear();
            }
        }
    }
    if(query(put, klika)) {
        while(true);
    }
    else {
        if(put.size()>klika.size()) return vrati(put);
        else return vrati(klika);
    }
}

Compilation message (stderr)

longesttrip.cpp: In function 'bool query(std::vector<int>, std::vector<int>)':
longesttrip.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i=0; i<a.size(); i++) A.pb(sh[a[i]]);
      |                  ~^~~~~~~~~
longesttrip.cpp:19:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i=0; i<b.size(); i++) B.pb(sh[b[i]]);
      |                  ~^~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60