Submission #676398

#	Time	Username	Problem	Language	Result	Execution time	Memory
676398		bane	Crocodile's Underground City (IOI11_crocodile)	C++14	0 / 100	1 ms	212 KiB

crocodile

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <complex>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <unordered_set>
#include <vector>
#include <climits>
#include <list>
using namespace std;
      
using ll = long long;
using db = long double; // or double, if TL is tight
using llu = unsigned long long;
using str = string; // yay python! 
      
// pairs
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pdb = pair<db,db>;
#define mp make_pair
#define fr first
#define sc second
      
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pii>;
using vpl = V<pll>;
using vpd = V<pdb>;
#define ms0(x) memset(x , 0, sizeof(x))
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
      
#define lb lower_bound
#define ub upper_bound
tcT> int lwb(V<T>& a, const T& b) { return int(lb(all(a),b)-bg(a)); }
tcT> int upb(V<T>& a, const T& b) { return int(ub(all(a),b)-bg(a)); }
      
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
      
const int MOD = (int)1e9+7; // 998244353;
const int MX = (int)2e5+5;
const ll BIG = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
  
const int dx[4] = {0,1,0,-1};
const int dy[4] = {-1,0,1,0};
 
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]){
	ll dp[N + 1];
	ll dist[N + 1];
	for (int i  = 0; i<=N; i++){
		dp[i]=1e18;
		dist[i] = 1e18;
	}
	priority_queue<pair<ll, int>>q;
	for (int i = 0; i < K; i++){
		dp[P[i]] = 0;
		q.push(mp(0,P[i]));
	}
	vector<pair<int,int>>edges[N + 1];
	for (int i = 0; i<M; i++){
		edges[R[i][0]].pb(mp(R[i][1], L[i]));
		edges[R[i][1]].pb(mp(R[i][0], L[i]));
	}
	while(!q.empty()){
		ll distt = -q.top().fr;
		int node = q.top().sc;
		q.pop();
		if (dp[node] != distt)continue;
		//cout<<node<<" "<<distt<<endl;
		for (auto edge : edges[node]){
			ll nx = dp[edge.fr];
			if (nx > distt + edge.sc){
				dp[edge.fr] = distt + edge.sc;
				q.push(mp( - (distt + edge.sc ), edge.fr));
			}
		}
	}
	priority_queue<pair<ll,int>>traverse;
	traverse.push(mp(0,0));
	ll ans = 1e9 + 1;
	dist[0]=0;
	int visited[N + 1];
	memset(visited, 0, sizeof(visited));
	while(!traverse.empty()){
		ll distt = -traverse.top().fr;
		int node = traverse.top().sc;
		visited[node] = 1;
		traverse.pop();
		//cout<<node<<" "<<distt<<endl;
		if (distt != dist[node])continue;
		ll  smallest = 1e18;
		ll smallest_ind = -1;
		ll second_ind = -1;
		ll second = 1e18;
		for (int i = 0; i< (int) edges[node].size(); i++){
			if (visited[edges[node][i].fr])continue;
			pair<int,ll>edge = edges[node][i];
			if (dp[edge.fr] + edge.sc < smallest){
				swap(second_ind, smallest_ind);
				swap(smallest, second);
				smallest = dp[edge.fr] + edge.sc;
				smallest_ind = i;
			}else if (dp[edge.fr] + edge.sc< second){
				second = dp[edge.fr] + edge.sc;
				second_ind = i;
			}
		}
		if (second_ind == -1 || smallest_ind == -1){
			//cout<<"no solution";
			continue;
		}
		//cout<<edges[node][smallest_ind].fr<<" "<<edges[node][second_ind].fr<<endl;
		if (dist[edges[node][second_ind].fr] > distt + edges[node][second_ind].sc){
			dist[edges[node][second_ind].fr] = distt + edges[node][second_ind].sc;
			traverse.push(mp(-dist[edges[node][second_ind].fr], edges[node][second_ind].fr));
		}
		
	}
	for (int i = 0; i<K; i++){
		ans = min(ans, dist[P[i]]);
	}
	return (int)ans;
} 

• Subtask 1: 0 / 46
• Subtask 2: 0 / 43
• Subtask 3: 0 / 11