Submission #774373

#	Time	Username	Problem	Language	Result	Execution time	Memory
774373		vjudge1	Travelling Merchant (APIO17_merchant)	C++17	0 / 100	2 ms	340 KiB

merchant

#include <bits/stdc++.h>
#define ve vector
#define vi vector<int>
#define vii vector<ii>
#define ii pair<int,int>
#define fi first
#define se second
#define ll long long
#define INF 1e18+7
#define pb push_back
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag,
    tree_order_statistics_node_update>;
const int MOD = 1e9+7;
const int nax = 100+5;
const int kax = 1005;
void readio(){
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
}

ll b[nax][kax], s[nax][kax], go[nax], to[nax];
ve<pair<int,ll>> adj[nax];
short vis[nax];
ll dfs(int u, ll dep){
    vis[u] = 1;
    //cout << u << endl;
    for(auto x : adj[u]){
        if(vis[x.fi] == 1 && x.fi == 0){
            to[u] = min(to[u], x.se);
        }
        if(!vis[x.fi]){
            dfs(x.fi, dep+x.se);
        }
        to[u] = min(to[x.fi]+x.se, to[u]);
        go[x.fi] = min(dep + x.se, go[x.fi]);
    }
    vis[u] = 2;
    return to[u];
}
int main()
{
    readio();
    optimise;
    int n,m,k;
    cin >> n >> m >> k;
    for (int i = 0; i < n; ++i)
    {
        go[i] = to[i] = INF;
        for (int j = 0; j < k; ++j)
        {
            cin >> b[i][j] >> s[i][j];
        }
    }
    for (int i = 0; i < m; ++i)
    {
        int a,b,c;
        cin >> a >> b >> c;
        a--,b--;
        adj[a].pb({b,c});
    }
    go[0] = 0;
    dfs(0,0);
    ll ans = 0;
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < k; ++j)
        {
            if(b[0][j] != -1 && s[i][j] != -1){
                ans = max(ans, (s[i][j]-b[0][j])/(to[i]+go[i])); 
            }
        }
    }
    cout << ans << endl;
}

Compilation message (stderr)

merchant.cpp: In function 'void readio()':
merchant.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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