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Submission #1065538

# Submission time Handle Problem Language Result Execution time Memory
1065538 2024-08-19T09:03:57 Z ReLice Longest Trip (IOI23_longesttrip) C++17
0 / 100
 42 ms 708 KB 
#include "longesttrip.h"
#include <bits/stdc++.h>
#define ll int
#define pb push_back
#define ins insert
#define fr first
#define sc second
#define vll vector<ll>
#define sz size()
using namespace std;

const ll N = 260;
const ll inf = 1e9 + 7;

vector<vll> g(N);
ll d[N],p[N];

void dfs(ll v){
	for(auto i : g[v]){
		if(d[i] != inf)continue;
		
		p[i] = v;
		d[i] = d[v] + 1;
		
		dfs(i);
	}
}

void cl(){
	for(ll i=0;i<N;i++){
		d[i] = inf;
		p[i] = i;
	}
}

pair<ll,ll> find(){
	ll mx = -1, x = 0;
	
	for(ll i=0;i<N;i++){
		if(d[i] != inf && d[i] > mx){
			mx = d[i];
			x = i;
		}
	}
	
	return {mx, x};
}

vector<int> longest_trip(int n, int D){
	ll i,j;
	
	for(i=0;i<n;i++){
		for(j=i+1;j<n;j++){
			if(are_connected({i},{j})){
				g[i].pb(j);
				g[j].pb(i);
			}
		}
	}
	
	ll rt = 0, ans = 0;
	
	for(i=0;i<n;i++){
		cl();
		
		d[i] = 0;
		dfs(i);
		
		auto [mx, x] = find();
		
		if(mx < ans){
			mx = ans;
			rt = i;
		}
	}
	
	cl();
	
	d[rt] = 0;
	dfs(rt);
	
	auto [mx, x] = find();
	
	vll v;
	while(x != p[x]){
		v.pb(x);
		x = p[x];
	}
	v.pb(x);
	
	return v;
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #1
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Incorrect 42 ms 488 KB Incorrect
3 Halted 0 ms 0 KB -

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 600 KB Output is correct
2 Incorrect 33 ms 600 KB Incorrect
3 Halted 0 ms 0 KB -

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 708 KB Output is correct
2 Incorrect 38 ms 600 KB Incorrect
3 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Incorrect 32 ms 488 KB Incorrect
3 Halted 0 ms 0 KB -