Submission #710586

#	Time	Username	Problem	Language	Result	Execution time	Memory
710586		blacktulip	Robot (JOI21_ho_t4)	C++17	24 / 100	488 ms	56244 KiB

Main

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long lo; 
typedef pair< lo,lo > PII;
 
#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)
 
const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 200005;
const lo mod = 1000000007;
 
int n,m,a[li],k,flag,t,x;
lo cev,cost[li],mn1[li],mn2[li];
vector<pair<int,pair<int,int>>> v[li];
unordered_map<int,long long> mpp[li];
//~ unordered_map<int,bool> vis[li];
bool vis[li];

inline int in(){
    int x;
    scanf("%d",&x);
    return x;
}

inline void sp(){
	priority_queue<pair<lo,pair<int,int>>> pq;
	pq.push({0,{0,1}});
	for(int i=1;i<=m;i++){
		cost[i]=10000000000000000;
		mn1[i]=10000000000000000;
		mn2[i]=10000000000000000;
	}
	cev=10000000000000000;
	while(pq.size()){
		lo co=-pq.top().fi;
		int renk=pq.top().se.fi;
		int node=pq.top().se.se;
		pq.pop();
		if(vis[node])continue;
		vis[node]=1;
		//~ cout<<co<<endl;
		cost[node]=min(cost[node],co);
		co=cost[node];
		if(node==n){cev=min(cev,co);continue;}
		for(auto go:v[node]){
			if(vis[go.fi]==0)pq.push({-co-mpp[node][go.se.fi]+go.se.se,{0,go.fi}});
			if(vis[go.fi]==0)pq.push({-co-go.se.se,{go.se.fi,go.fi}});
			mn1[go.se.fi]=min(mn1[go.se.fi],cost[go.fi]);
			//~ if(mn2[go.se.fi]<mn1[go.se.fi])swap(mn2[go.se.fi],mn1[go.se.fi]);
		}
		for(auto go:v[node]){
			if(cost[go.fi]>mn1[go.se.fi]+mpp[node][go.se.fi]-go.se.se){
				cost[go.fi]=mn1[go.se.fi]+mpp[node][go.se.fi]-go.se.se;
				//~ vis[go.fi]=0;
				//~ cout<<go.fi<<" :: "<<cost[go.fi]<<" :: "<<node<<" :: "<<go.se.se<<" :: "<<mn1[go.se.fi]<<" :: "<<go.se.fi<<endl;
				pq.push({-cost[go.fi],{0,go.fi}});
			}
		}
		for(auto go:v[node]){
			mn1[go.se.fi]=10000000000000000;
			mn2[go.se.fi]=10000000000000000;
		}
	}
	if(cev>=10000000000000000)cev=-1;
	printf("%lld\n",cev);
}

int main(void){
    n=in(),m=in();
    for(int i=1;i<=m;i++){
		int x=in(),y=in(),c=in(),p=in();
		v[x].pb({y,{c,p}});
		v[y].pb({x,{c,p}});
		mpp[x][c]+=p;
		mpp[y][c]+=p;
	}
	sp();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void sp()':
Main.cpp:48:7: warning: unused variable 'renk' [-Wunused-variable]
   48 |   int renk=pq.top().se.fi;
      |       ^~~~
Main.cpp: In function 'int in()':
Main.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d",&x);
      |     ~~~~~^~~~~~~~~

• Subtask 1: 0 / 34
• Subtask 2: 24 / 24
• Subtask 3: 0 / 42