Submission #1071885

#	Time	Username	Problem	Language	Result	Execution time	Memory
1071885		mindiyak	Longest Trip (IOI23_longesttrip)	C++17	30 / 100	919 ms	1504 KiB

longesttrip

#include "longesttrip.h"
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<int, int> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;

vvi paths;
vi visited;
vi cur_path;
int node,dis;

void dfs(int pos,int height,vi cur){
    if(visited[pos])return;
    cur.pb(pos);
    visited[pos] = 1;
    if(dis < height){
        dis = height;
        node = pos;
        cur_path = cur;
    }
    for(int a:paths[pos]){
        dfs(a,height+1,cur);
    }
}

vi longest_trip(int N, int D)
{
    paths = vvi(N);
    FOR(i,0,N){
        FOR(j,i+1,N){
            if(are_connected({i},{j})){
                paths[i].pb(j);
                paths[j].pb(i);
            }
        }
    }

    // visited = vi(N,0);
    // vi possibles;

    // FOR(i,0,N){
    //     if(visited[i])continue;
    //     node = -1;
    //     dis = -1;
    //     vi cur;
    //     dfs(i,1,cur);
    //     if(node != -1)possibles.pb(node);
    // }

    visited = vi(N,0);
    int temp = -1;
    vi ans;
    cur_path = vi();

    FOR(i,0,N){
        node = -1;
        dis = -1;
        vi cur;
        dfs(i,1,cur);
        if(temp < dis){
            temp = dis;
            ans = cur_path;
        }
    }

    return ans;
}

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