Submission #775294

#	Time	Username	Problem	Language	Result	Execution time	Memory
775294		vjudge1	Travelling Merchant (APIO17_merchant)	C++17	0 / 100	15 ms	3260 KiB

merchant

#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pair<ll, ll>, null_type, less<pair<ll,ll>>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////

void usaco_problem(){
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
}

void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}

const int mx = 105;
const int LOG = 25;
const int inf = 1e9;
const ll mod = 1e8;

int n, m, k;

vl B[mx], S[mx];

vii graph[mx];

ll adj[mx][mx];

ll distances[mx][mx];

void run_case(){
    cin >> n >> m >> k;
    for(int i = 1; i <= n;i++){
        for(int j = 0; j < k;j++){
            int x;cin >> x;
            B[i].pb(x);
            cin >> x;  
            S[i].pb(x);
        }
    }
    memset(adj, -1, sizeof adj);
    while(m--){
        int a, b, w;cin >> a >> b >> w;
        adj[a][b] = w;
    }
    for(int i = 1; i <= n;i++){
        for(int j = 1; j <= n;j++){
            if(i == j)distances[i][j] = 0;
            else if(adj[i][j] != -1)distances[i][j] = adj[i][j];
            else distances[i][j] = inf;
        }
    }
    for(int k = 1; k <= n;k++){
        for(int i = 1; i <= n;i++){
            for(int j = 1; j <= n;j++){
                distances[i][j] = min(distances[i][j], distances[i][k]+distances[k][j]);
            }
        }
    }
    ll ans = 0;
    for(int i = 2; i <= n;i++){
        if(distances[1][i] != inf && distances[i][1] != inf){
            ll x = distances[1][i] + distances[i][1];
            ll cost = 0;
            for(int j = 0;j < k;j++){
                if(B[1][j] != -1 && S[1][j] != -1){
                    cost = max(cost, S[1][j] - B[1][j]);
                }
            }
            ans = max(ans, cost/x);
        }
    }
    cout << ans << endl;
}

int main(){
    //init();
    speed;
    int t;
    //cin >> t;
    t = 1;
    while(t--){
        run_case();
    }
}

/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
    Your Guide when stuck:
    - Continue keyword only after reading the whole input
    - Don't use memset with testcases
    - Check for corner cases(n=1, n=0)
    - Check where you declare n(Be careful of declaring it globally and in main)
*/

Compilation message (stderr)

merchant.cpp: In function 'void usaco_problem()':
merchant.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp: In function 'void init()':
merchant.cpp:39:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:41:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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