Submission #484540

#	Time	Username	Problem	Language	Result	Execution time	Memory
484540		BackNoob	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	435 ms	55520 KiB

crocodile

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define MASK(i) (1LL << (i))
#define ull unsigned long long
#define ld long double
#define pb push_back
#define all(x) (x).begin() , (x).end()
#define BIT(x , i) ((x >> (i)) & 1) 
#define TASK "task"
#define sz(s) (int) (s).size()

using namespace std;
const int mxN = 3e5 + 227;
const int inf = 1e9 + 277;
const int mod = 1e9 + 7;
const ll infll = 1e18 + 7;
const int base = 307;
const int LOG = 20;
 
template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}

int n , m , k;
vector<pair<int , int>> adj[mxN];
bool exitnode[mxN];
ll dp1[mxN] , dp2[mxN];


ll travel_plan(int n , int m , int r[][2] , int l[] , int k , int p[])
{	

	for(int i = 0 ; i < m ; i++) {
		int u = r[i][0];
		int v = r[i][1];
		int c = l[i];
		++u; ++v;
		adj[u].pb({v , c});
		adj[v].pb({u , c});
	}


	memset(dp1, 0x3f , sizeof dp1);
	memset(dp2, 0x3f , sizeof dp2);
	priority_queue <pair<ll , int>, vector <pair<ll , int>> , greater<pair<ll , int>>> pq;
	for(int i = 0 ; i < k ; i++) {
		exitnode[p[i] + 1] = true;
 		pq.push({dp1[p[i] + 1] = dp2[p[i] + 1] = 0 , p[i] + 1});
	}
	while(!pq.empty()) {
		int u = pq.top().se;
		ll d = pq.top().fi;
		pq.pop();
		if(d > dp2[u]) continue;

		for(auto it : adj[u]) {
			int v = it.fi;
			int c = it.se;
			if(dp1[v] > d + c) {
				if(dp2[v] > dp1[v])  {
					dp2[v] = dp1[v];
					pq.push({dp2[v] , v});
				}
				dp1[v] = d + c;
			}
			else {
				if(dp2[v] > d + c) {
					dp2[v] = d + c;
					pq.push({d + c , v});
				}
			}
		}
	}
	return dp2[1];

}

 

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