Submission #401229

#	Time	Username	Problem	Language	Result	Execution time	Memory
401229		amunduzbaev	Travelling Merchant (APIO17_merchant)	C++14	0 / 100	1117 ms	526272 KiB

merchant

/* made by amunduzbaev */
 
#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 vv vector
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define sz(x) (int)x.size()
#define tut(x) array<int, x> 
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define NeedForSpeed ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii; 
typedef vector<int> vii;
typedef vector<pii> vpii;
 
template<class T> bool umin(T& a, const T& b) { return a > b? a = b, true:false; }
template<class T> bool umax(T& a, const T& b) { return a < b? a = b, true:false; }
//void usaco(string s) { freopen((s+".in").c_str(),"r",stdin);  
	//freopen((s+".out").c_str(),"w",stdout); }
//template<class T> tree<T, 
//less<T>, null_type, rb_tree_tag, 
//tree_order_statistics_node_update> ordered_set;
 
const int N = 105;
const int mod = 1e9+7;
const ll inf = 1e17;
const ld Pi = acos(-1);
const int B = 1e7;
 
#define MULTI 0
int n, m, k, ans, q, res, a[N];
int b[N][1005], s[N][1005];
int tt[N][N], mx[N][N], is[N][N], prof[N][N];
pii cd[N][N];

void solve(int t_case){
	cin>>n>>m>>k;
	for(int i=1;i<=n;i++){
		for(int j=0;j<k;j++){
			cin>>b[i][j]>>s[i][j];
		}
	}
	for(int i=1;i<=n;i++) for(int j=i+1;j<=n;j++) tt[i][j] = tt[j][i] = inf;
	for(int i=0;i<m;i++){
		int a, b, c; cin>>a>>b>>c; 
		tt[a][b] = c;
	}
	for(int k=1;k<=n;k++){
		for(int i=1;i<=n;i++){
			for(int j=1;j<=n;j++){
				umin(tt[i][j], tt[i][k] + tt[k][j]);
			}
		}
	}
	
	int K = k;
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			for(int k=0;k<K;k++){
				if(~b[i][k] && ~s[j][k]) 
				umax(prof[i][j], - b[i][k] + s[j][k]);
			}
		}
	}
	
	//cout<<"\n";
	for(int i=1;i<=n;i++){
		priority_queue<tut(4)> qq;
		qq.push({0, 0, 0, i});
		//cout<<i<<"\n";
		while(!qq.empty()){
			tut(4) x = qq.top(); qq.pop();
			if(mx[i][x[3]] > x[0]) continue;
			//cout<<x[3]<<" "<<x[0]<<" "<<x[1]<<" "<<x[2]<<"\n";
			for(int j=1;j<=n;j++){
				if(tt[x[3]][j] == inf || x[3] == j) continue;
				int cost = x[1] + prof[x[3]][j], dis = x[2] + tt[x[3]][j];
				is[i][j] = 1;
				//cout<<x[3]<<" "<<j<<" "<<cost - x[1]<<" "<<dis - x[2]<<"\n";
				assert(dis);
				if(umax(mx[i][j], cost / dis)) cd[i][j] = {cost, dis}, qq.push({mx[i][j], cost, dis, j});
			}
		}
		//cout<<"~~ end ~~\n"; 
	} 
	
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			if(!is[i][j] || !is[j][i]) continue;
			int dis = cd[i][j].ss + cd[j][i].ss;
			if(!cd[i][j].ss) dis += tt[i][j];
			if(!cd[j][i].ss) dis += tt[j][i];
			assert(dis);
			umax(res, (cd[i][j].ff + cd[j][i].ff) / dis);
		}
	} cout<<res<<"\n";
}

signed main(){ 
	
	NeedForSpeed
	if(!MULTI) {
		solve(1);
	} else {
		int t; cin>>t;
		for(int t_case = 1; t_case <= t; t_case++) solve(t_case);
	} return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 34