Submission #1254248

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254248		M_SH_O	Travelling Merchant (APIO17_merchant)	C++20	100 / 100	51 ms	2376 KiB

merchant

#include <bits/stdc++.h>
#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ordered_set tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
//using namespace __gnu_pbds;

const ll INF = 1e18;
const int lg = 20;

mt19937 rng(time(0));
ll randll(ll l, ll r){
    return uniform_int_distribution<ll>(l, r)(rng);
}

vector<vpll> b;
vvll g;

int main(){
    speed;
    ll n, m, k;
    cin >> n >> m >> k;
    
    g.resize(n+7, vll(n+7, INF));
    b.resize(n+7, vpll(k, {-1, -1}));
    for(int i = 1; i <= n; i ++){
        //g[i][i] = 0;
        for(int j = 0; j < k; j ++){
            cin >> b[i][j].fr >> b[i][j].se;
        }
    }
    
    for(int i = 0; i < m; i ++){
        ll a, b, c;
        cin >> a >> b >> c;
        g[a][b] = c;
    }
    
    for(int i = 1; i <= n; i ++){
            for(int j = 1; j <= n; j ++){
                for(int i1 = 1; i1 <= n; i1 ++){
                    g[j][i1] = min(g[j][i1], g[j][i]+g[i][i1]);
                }
            }
        }
    
    vvll p(n+7, vll(n+7, 0));
    ll maxl = 0;
    for(int a = 1; a <= n; a ++){
        for(int c = 1; c <= n; c ++){
            for(int i = 0; i < k; i ++){
                if(b[a][i].fr == -1 || b[c][i].se == -1) continue;
                //cout << a << ' ' << c << ' ' << i << ' ' << b[a][i].fr << ' ' << b[c][i].se << endl;
                p[a][c] = max(p[a][c], b[c][i].se-b[a][i].fr);
            }
        }
        maxl = max(maxl, p[a][a]);
    }
    
    ll l = 0, r = 1e9+7;
    while(r - l > 1){
        ll x = (l+r)/2;
        
        vvll newg(n+7, vll(n+7, INF));
        for(int i = 1; i <= n; i ++){
            for(int j = 1; j <= n; j ++){
                newg[i][j] = min(newg[i][j], x*min(INF/x, g[i][j]) - p[i][j]);
            }
        }
        
        
        /*for(int i = 1; i <= n; i ++){
            for(int j = 1; j <= n; j ++){
                if(p[i][j] == -INF) continue;
                cout << i << ' ' << j << ' ' << p[i][j] << endl;
            }
            cout << endl;
        }
        
        for(int i = 1; i <= n; i ++){
            for(int j = 1; j <= n; j ++){
                cout << newg[i][j] << ' ';
            }
            cout << endl;
        }*/
        
        for(int i = 1; i <= n; i ++){
            for(int j = 1; j <= n; j ++){
                for(int i1 = 1; i1 <= n; i1 ++){
                    newg[j][i1] = min(newg[j][i1], newg[j][i]+newg[i][i1]);
                }
            }
        }
        
        bool q = 0;
        for(int i = 1; i <= n; i ++){
            //cout << newg[i][i] << ' ';
            if(newg[i][i] <= 0) q = 1;
        }
        //cout << endl;
        if(q) l = x;
        else r = x;
    }
    
    cout << max(maxl, l) << endl;
}

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