Submission #937743

#	Time	Username	Problem	Language	Result	Execution time	Memory
937743		Baizho	Travelling Merchant (APIO17_merchant)	C++14	0 / 100	57 ms	8760 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
 
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt,sse3,avx")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(2e5)+100;
const int M = ll(2e5) + 100;
const long long inf = 2e18;
//const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
 
int n, m, k1, b[105][1005], s[105][1005];
long long dis[1005][1005], profit[1005][1005], dis1[1005][1005];
void Baizho() {
	cin>>n>>m>>k1;
	for(int i = 1; i <= n; i ++) {
		for(int j = 1; j <= k1; j ++) {
			cin>>b[i][j]>>s[i][j];
		}
	}
	for(int i = 1; i <= m; i ++) {
		int a, b, w; cin>>a>>b>>w;
		dis[a][b] = w;
	}
	for(int i = 1; i <= n; i ++) {
		for(int j = 1; j <= n; j ++) {
			dis[i][j] = inf;
		}
	}
	for(int i = 1; i <= n; i ++) {
		for(int j = 1; j <= n; j ++) {
			for(int k = 1; k <= k1; k ++) {
				if(b[i][k] != -1 && s[j][k] != -1) profit[i][j] = max(profit[i][j], 1LL * s[j][k] - b[i][k]);
			}
		}
	}
	for(int i = 1; i <= n; i ++) {
		for(int j = 1; j <= n; j ++) {
			for(int k = 1; k <= n; k ++) {
				dis[i][j] = min(dis[i][j], dis[i][k] + dis[k][j]);
			}
		}
	}
	ll l = 0, r = 2e9;
	while(l <= r) {
		ll x = (l + r) / 2;
		for(int i = 1; i <= n; i ++) for(int j = 1; j <= n; j ++) dis1[i][j] = -inf;
		for(int i = 1; i <= n; i ++) {
			for(int j = 1; j <= n; j ++) {
				if(x < inf / dis[i][j]) dis1[i][j] = profit[i][j] - x * dis[i][j];
				else dis1[i][j] = -inf;
			}
		}
		for(int i = 1; i <= n; i ++) {
			for(int j = 1; j <= n; j ++) {
				for(int k = 1; k <= n; k ++) {
					dis1[i][j] = max(dis1[i][j], dis1[i][k] + dis1[k][j]);
				}
			}
		}
		bool ok = 0;
		for(int i = 1; i <= n; i ++) ok |= (dis1[i][i] >= 0);
		if(ok) l = x + 1;
		else r = x - 1;
	}
	cout<<l + 1<<"\n";
}
 
signed main() {		
// 	Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
//   	precalc();
   	
    int ttt = 1;
//    cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

merchant.cpp: In function 'void Freopen(std::string)':
merchant.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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