Submission #269791

#	Time	Username	Problem	Language	Result	Execution time	Memory
269791		sean9892	주유소 (KOI16_gas)	C++14	100 / 100	122 ms	50336 KiB

gas

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pii=pair<int,int>;
using dat=pair<ll,pii>;
#define fi first
#define se second

vector<pii> g[2510];
int cst[2510];
ll dst[2510][2510];

int main(void){
	ios::sync_with_stdio(0);cin.tie(0);
	
	int n,m;
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>cst[i];
	}
	for(int i=0;i<m;i++){
		int a,b,c;
		cin>>a>>b>>c;
		g[a].emplace_back(b,c);
		g[b].emplace_back(a,c);
	}
	
	memset(dst,0x3f,sizeof(dst));
	dst[1][cst[1]]=0;
	priority_queue<dat> q;
	
	ll res=0x3f3f3f3f3f3f3f3f;
	
	#define pushDat(d,x,c) q.push(dat(-(d),pii(x,c)))
	#define popDat(d,x,c) do{d=-q.top().fi;x=q.top().se.fi;c=q.top().se.se;q.pop();}while(0)
	
	pushDat(0,1,cst[1]);
	while(!q.empty()){
		ll d;
		int x,c;
		popDat(d,x,c);
		if(dst[x][c]<d)continue;
		if(x==n){
			res=min(res,d);
		}
		for(auto& e:g[x]){
			int i,w;
			tie(i,w)=e;
			if(dst[i][min(c,cst[i])]>d+c*w){
				dst[i][min(c,cst[i])]=d+c*w;
				pushDat(d+c*w,i,min(c,cst[i]));
			}
		}
	}
	
	#undef pushDat
	#undef popDat
	
	cout<<res;
}

• Subtask 1: 18 / 18
• Subtask 2: 15 / 15
• Subtask 3: 16 / 16
• Subtask 4: 24 / 24
• Subtask 5: 27 / 27