Submission #162478

#	Time	Username	Problem	Language	Result	Execution time	Memory
162478		MvC	Toll (BOI17_toll)	C++11	56 / 100	3035 ms	8568 KiB

toll

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=5e4+50;
const int mod=1e9+7;
using namespace std;
int k,n,m,x,y,t,f[nmax],z,i,j,q,g[nmax],u[nmax],c[nmax];
vector<pair<int,int> >a[nmax];
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>k>>n>>m>>q;
	while(m--)
	{
		cin>>x>>y>>t;
		a[x].pb(mkp(y,t));
	}
	for(i=0;i<n;i++)g[i]=u[i]=c[i]=inf;
	g[0]=0;
	u[0]=0;
	c[0]=0;
	for(i=0;i<n;i++)
	{
		if(g[i]==inf)continue;
		for(j=0;j<(int)a[i].size();j++)
		{
			z=a[i][j].fr,t=a[i][j].sc;
			g[z]=min(g[z],g[i]+t);
		}
	}
	for(i=0;i<n;i++)
	{
		if(u[i]==inf)u[i]=i,c[i]=0;
		for(j=0;j<(int)a[i].size();j++)
		{
			z=a[i][j].fr,t=a[i][j].sc;
			u[z]=min(u[z],u[i]);
			c[z]=min(c[z],c[i]+t);
		}
	}
	while(q--)
	{
		cin>>x>>y;
		if(y/k<=x/k)cout<<-1<<'\n';
		else if(!x)
		{
			if(g[y]==inf)cout<<-1<<'\n';
			else cout<<g[y]<<'\n';
		}
		else if(k==1)
		{
			if(u[y]>x)cout<<-1<<'\n';
			else cout<<c[y]-c[x]<<'\n';
		}
		else
		{
			for(i=x;i<=y;i++)f[i]=inf;
			f[x]=0;
			for(i=x;i<=y;i++)
			{
				if(f[i]==inf)continue;
				for(j=0;j<(int)a[i].size();j++)
				{
					z=a[i][j].fr,t=a[i][j].sc;
					f[z]=min(f[z],f[i]+t);
				}
			}
			if(f[y]==inf)cout<<-1<<'\n';
			else cout<<f[y]<<'\n';
		}
	}
	return 0;
}

Compilation message (stderr)

toll.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
toll.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 8 / 8
• Subtask 4: 31 / 31
• Subtask 5: 0 / 44