Submission #896519

#	Time	Username	Problem	Language	Result	Execution time	Memory
896519		LCJLY	Crocodile's Underground City (IOI11_crocodile)	C++14	0 / 100	2 ms	4444 KiB

crocodile

#include "crocodile.h"
//
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int>pii;
//#define int long long

int travel_plan(int n, int m, int r[][2], int w[], int k, int p[]){
	vector<pii>adj[n+5];
	for(int x=0;x<m;x++){
		adj[r[x][0]].push_back({r[x][1],w[x]});
		adj[r[x][1]].push_back({r[x][0],w[x]});
	}
	
	pii dist[n+5];
	memset(dist,-1,sizeof(dist));
	priority_queue<pii,vector<pii>,greater<pii>>pq;
	for(int x=0;x<k;x++){
		dist[p[x]]={0,0};
		pq.push({0,p[x]});
	}
	
	bool visited[n+5];
	memset(visited,0,sizeof(visited));
	while(!pq.empty()){
		pii cur=pq.top();
		pq.pop();
		int x=cur.second;
		int d=cur.first;
		if(dist[x].second==-1||dist[x].second!=d) continue;
		visited[x]=true;
		
		for(auto it:adj[x]){
			int nx=it.first;
			int nd=d+it.second;
			if(dist[nx].second!=-1&&dist[nx].second<=nd) continue;
			if(dist[nx].first==-1||nd<=dist[nx].first){
				dist[nx].second=dist[nx].first;
				dist[nx].first=nd;
				pq.push({nd,nx});
			}
			else{
				dist[nx].second=nd;
				pq.push({nd,nx});
			}
		}
	}
	
	if(dist[0].second!=-1){
		return dist[0].second;
	}
	else return -1;
}

Compilation message (stderr)

crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:16:29: warning: 'void* memset(void*, int, size_t)' writing to an object of type 'pii' {aka 'struct std::pair<int, int>'} with no trivial copy-assignment [-Wclass-memaccess]
   16 |  memset(dist,-1,sizeof(dist));
      |                             ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/char_traits.h:39,
                 from /usr/include/c++/10/ios:40,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from crocodile.cpp:3:
/usr/include/c++/10/bits/stl_pair.h:211:12: note: 'pii' {aka 'struct std::pair<int, int>'} declared here
  211 |     struct pair
      |            ^~~~

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