Submission #1036106

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036106		HNa_seawjing	Robot (JOI21_ho_t4)	C++14	0 / 100	58 ms	17492 KiB

Main

#include <bits/stdc++.h>
//code
#define fl(i,x,y,z) for(int i=x;i<=y;i=i+z)
#define fn(i,x,y,z) for(int i=x;i>=y;i=i-z)
#define rep(i,x,y) for(int i=x;i<y;i=i+1)
#define all(v) v.begin(),v.end()
#define pb push_back
#define tle cout<<"tle"<<endl
#define edl cout<<"\n"
#define el "\n"
#define getbit(x,i) ((x>>i)&1)
#define bitcnt __builtin_popcount
//ham
#define pii pair<int,int>
#define fi first
#define se second
#define ll long long
#define ld long double
#define inf 0x3f3f3f3f
//#define int long long
using namespace std;
const ll mod=1e9+7;
int n,m;
vector<pii> a[100005];
vector<pair <int,pii>> g[100005];
int d[100005];
int t[100005];
bool vis[100005];
priority_queue< pair < int,int > , vector < pair < int ,int > > , greater < pair < int , int > > > q;
void dij(int x)
{
	fl(i,1,n,1) d[i] = 1e9;
	d[x] = 0;
	q.push({0, x});
	while (!q.empty())
	{
		auto p1 = q.top();
		int W = p1.fi;
		int x = p1.se;
		q.pop();
		if (vis[x])
			continue;
		vis[x] = 1;
		for (auto p2 : a[x])
		{
			int y = p2.fi;
			int w = p2.se;
			if (vis[y] || d[y] < W + w)
				continue;
			d[y] = W + w;
			q.push({W + w, y});
		}
	}
}
void inp()
{
	cin >> n >> m;
	fl(i,1,m,1)
	{
	    int u,v,c,p;
		cin >> u >> v >> c >> p;
		g[u].push_back({c, {v, p}});
		g[v].push_back({c, {u, p}});
		a[u].push_back({v, p});
		a[v].push_back({u, p});
	}
}
void sol()
{
	int cur = n;
	fl(i,1,n,1)
	{
		sort(g[i].begin(), g[i].end());
		for (auto it : g[i])
			t[it.fi] += it.se.se;
		for (auto it : g[i])
		{
			if (!vis[it.fi])
			{
				++cur;
				a[i].push_back({cur,0});
			}
			vis[it.fi] = 1;
			a[cur].push_back({it.se.fi, t[it.fi] - it.se.se});
			a[it.se.fi].push_back({cur, 0});
		}
		for (auto it : g[i])
		{
			t[it.fi] = 0;
			vis[it.fi] = 0;
		}
	}
	dij(1);
	if (d[n]==1e9) cout<<"-1";
	else cout<<d[n];
}
signed main()
{
//    freopen("task.inp","r",stdin);
//    freopen("task.out","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    inp();
    sol();
    return 0;
}
/*   /\_/\
    ( ._. )
    / >V< \
*/

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