Submission #1109632

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109632		theSkeleton	Toll (BOI17_toll)	C++17	8 / 100	3076 ms	94280 KiB

toll

//!!in the name of god!!
#include<bits/stdc++.h>
#define space <<' '<<
#define endl '\n'
#define inf 1e9
#define F first
#define S second
#define PB push_back
#define PF push_front
#define pll pair<ll,ll>
#define pii pair<int,int>
#define md(a) ((a+mod)%mod)
#define MP(a,b) make_pair(a,b)
#define all(a) a.begin(),a.end()
#define MT(a,b,c) make_tuple(a,b,c)
#define has(a,b) (a.find(b)!=a.end())
typedef long long ll;
using namespace std;
template<typename t> using heap=
priority_queue<t,vector<t>,greater<t>>;
const int mx = 5e4+5;
const int lg = 32;
map<int,ll> adj[mx][lg];
int glg(int v){
    if(v<2)return 0;
    return glg(v/2)+1;
}
int main(){
    std::ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int k,n,m,o;
    cin>>k>>n>>m>>o;
    for(int u,v,t;m--;)
        cin>>u>>v>>t,
        adj[u][0][v]=t;
    for(int t=0;t<n;t++)
    for(int p=1;p<lg;p++){
        for(auto e:adj[t][p-1])
        for(auto d:adj[e.F][p-1])
        if(has(adj[t][p],d.F))
            adj[t][p][d.F]=min(adj[t][p][d.F],e.S+d.S);
        else
            adj[t][p][d.F]=e.S+d.S;
    }
    for(int a,b;o--;){
        cin>>a>>b;
        int c=a/k,t=b/k;
        map<int,ll> cn,te;
        cn[a]=0;
        while(c<t){
            te.clear();
            int ne=glg(c-t);
            for(auto e:cn)
                for(auto d:adj[e.F][ne])
                    if(has(te,d.F))
                        te[d.F]=min(te[d.F],e.S+d.S);
                    else te[d.F]=e.S+d.S;
            cn=te;
            c+=1<<ne;
        }
        if(has(cn,b)) cout<<cn[b]<<endl;
        else cout<<-1<<endl;
    }
    return 0;
}

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