Submission #784854

#	Time	Username	Problem	Language	Result	Execution time	Memory
784854		mars4	Toll (BOI17_toll)	C++17	100 / 100	553 ms	98176 KiB

toll

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace std;
using namespace __gnu_pbds; 

#define ff              first
#define ss              second
#define ll              int64_t
#define ld              long double
#define nl              cout<<"\n"
#define i128            __int128_t
#define all(v)          v.begin(),v.end()
#define mset(a,v)       memset((a),(v),sizeof(a))
#define forn(i,a,b)     for(int64_t i=int64_t(a);i<int64_t(b);++i)
#define forb(i,a,b)     for(int64_t i=int64_t(a);i>=int64_t(b);--i)
#define fastio()        ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define mod         1'000'000'007
#define mod2        998'244'353 
#define inf         1'000'000'000'000'007
#define pi          3.14159265358979323846

template<class key,class cmp=std::less<key>>
using ordered_set=tree<key,null_type,cmp,rb_tree_tag,tree_order_statistics_node_update>;

template<class L,class R> ostream& operator<<(ostream& out,pair<L,R> &p)        {return out<<"("<<p.ff<<", "<<p.ss<<")";}
template<class T> ostream& operator<<(ostream& out,vector<T> &v)                {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,deque<T> &v)                 {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,set<T> &s)                   {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class T> ostream& operator<<(ostream& out,ordered_set<T> &s)           {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class L,class R> ostream& operator<<(ostream& out,map<L,R> &m)         {out<<"{";for(auto it=m.begin();it!=m.end();++it){if(it!=m.begin())out<<", ";out<<*it;}return out<<"}";}

void dbg_out() {cerr<<"]\n";}
template<typename Head,typename... Tail> 
void dbg_out(Head H,Tail... T) {cerr<<H;if(sizeof...(Tail))cerr<<", ";dbg_out(T...);}
#ifdef LOCAL
#define dbg(...) cerr<<"["<<#__VA_ARGS__<<"] = [",dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

//---------------------------------mars4---------------------------------

int main()
{
	fastio();
	ll z,n,m,t,k,i,j,l,d,h,r;
	const ll logN=20;
	ll q;
	cin>>k>>n>>m>>q;
	ll N=(n+k-1)/k;
	vector val(N,vector(logN,vector(k,vector(k,(ll)inf))));
	vector jmp(N,vector(logN,(ll)0));
	jmp[N-1][0]=N-1;
	forn(i,0,N-1)
	{
		jmp[i][0]=i+1;
	}
	forn(i,0,m)
	{
		cin>>l>>r>>d;
		val[l/k][0][l%k][r%k]=d;
	}
	auto combine=[&](vector<vector<ll>> a,vector<vector<ll>> b)
	{
		vector<vector<ll>> res(k,vector<ll>(k,inf));
		forn(i,0,k)
		{
			forn(j,0,k)
			{
				forn(h,0,k)
				{
					res[i][h]=min(res[i][h],a[i][j]+b[j][h]);
				}
			}
		}
		return res;
	};
	forn(j,1,logN)
	{
		forn(i,0,N)
		{
			jmp[i][j]=jmp[jmp[i][j-1]][j-1];
			val[i][j]=combine(val[i][j-1],val[jmp[i][j-1]][j-1]);
		}
	}
	auto calc=[&](ll l,ll r)
	{
		ll jumps=r/k-l/k;
		if(!jumps)
		{
			return (ll)-1;
		}
		vector res(k,vector(k,(ll)inf));
		forn(i,0,k)
		{
			res[i][i]=0;
		}
		ll ind=l/k;
		forb(i,logN-1,0)
		{
			if(jumps&(1ll<<i))
			{
				res=combine(res,val[ind][i]);
				ind=jmp[ind][i];
			}
		}
		ll ans=res[l%k][r%k];
		if(ans>=inf)
		{
			ans=-1;
		}
		return ans;
	};
	while(q--)
	{
		cin>>l>>r;
		cout<<calc(l,r)<<"\n";
	}
	cerr<<"\nTime elapsed: "<<1000*clock()/CLOCKS_PER_SEC<<"ms\n";
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:49:5: warning: unused variable 'z' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
toll.cpp:49:11: warning: unused variable 't' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
toll.cpp:49:15: warning: unused variable 'i' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
toll.cpp:49:17: warning: unused variable 'j' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
toll.cpp:49:23: warning: unused variable 'h' [-Wunused-variable]
   49 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                       ^

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