Submission #1136822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1136822		thelegendary08	Toll (BOI17_toll)	C++17	17 / 100	58 ms	12872 KiB

toll

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define pout(a) cout<<a.first<<' '<<a.second<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
const int mxn = 5e4 + 5;
vpii adj[mxn];
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	//ifstream cin(".in");
	//ofstream cout(".out");
	in4(k,n,m,q);
	f0r(i,m){
		in3(a,b,w);
		adj[a].pb(mp(b,w));
	}
	if(k == -1){
		vi v(n-1);
		f0r(i,n-1){
			if(adj[i].size() != 0)v[i] = adj[i][0].second;
			else v[i] = 1e9;
		}
		vi ps(n);
		FOR(i, 1, n){
			ps[i] = ps[i-1] + v[i-1];
		}
		while(q--){
			in2(a,b);
			if(ps[b] - ps[a] < 1e9)cout<<ps[b] - ps[a]<<'\n';
			else cout<<-1<<'\n';
		}
	}
	else{
		vvi dist(n, vi(k, 4e18));
		for(int i = 0; i<n; i += k){
			FOR(j, i, min(i+k,n)){
				FOR(l, i+k, i+2*k){
					if(l < n){
						adj[j].pb({l,1e9});
					}
				}
			}
		}
		f0r(kk,min(k,n)){
			dist[kk][kk] = 0;
			priority_queue<pii>pq;
			pq.push({0,kk});
			while(!pq.empty()){
				int node = pq.top().second;
				pq.pop();
				for(auto u : adj[node]){
					int nxt = u.first;
					int w = u.second;
					if(dist[nxt][kk] > dist[node][kk] + w){
						dist[nxt][kk] = dist[node][kk] + w;
						pq.push(mp(-dist[nxt][kk], nxt));
					}
				}
			}
		}
		
		while(q--){
			in2(a,b);
			int mn = 4e18;
			f0r(kk, min(k,n)){
				if(dist[a][kk] != 4e18 && dist[b][kk] != 4e18){
					mn = min(mn, dist[b][kk] - dist[a][kk]);
				}
			}
			if(mn >= 1e9)out(-1);
			else out(mn);
		}
		
	}
	
}

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