Submission #466457

#	Time	Username	Problem	Language	Result	Execution time	Memory
466457		Killer2501	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	160 ms	4292 KiB

merchant

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define task "262144"
#define pll pair<ll, ll>
#define pi pair<pll, pll>
#define fi first
#define se second

using namespace std;
const ll mod = 1e16;
const ll N = 1e2+5;
const int base = 313;
ll n, m, t, k, T, ans, tong, a[N], c[N][N], dp[N][N], b[N][N*10], s[N][N*10], w[N][N];
vector<ll> adj[N];
vector<ll> kq;
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n & 1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
bool check(ll x)
{
    for(int i = 1; i <= n; i ++)
    {
        for(int j = 1; j <= n; j ++)
        {
            dp[i][j] = c[i][j] - min(w[i][j], mod/x) * x;
        }
    }
    for(int p = 1; p <= n; p ++)
    {
        for(int i = 1; i <= n; i ++)
        {
            for(int j = 1; j <= n; j ++)
            {
                dp[i][j] = min(mod,max(dp[i][j], dp[i][p] + dp[p][j]));
            }
        }
    }
    for(int i = 1; i <= n; i ++)
    {
        for(int j = 1; j <= n; j ++)
        {
            if(i == j || dp[i][j] == -mod || dp[j][i] == -mod)continue;
            if(dp[i][j] + dp[j][i] >= 0)return true;
        }
    }
    return false;
}
void sol()
{
    cin >> n >> m >> k;
    for(int i = 1; i <= n; i ++)
    {
        for(int j = 1; j <= k; j ++)cin >> b[i][j] >> s[i][j];
        for(int j = 1; j <= n; j ++)
        {
            if(i == j)continue;
            w[i][j] = mod;
        }
    }
    while(m -- > 0)
    {
        ll x, y;
        cin >> x >> y;
        cin >> w[x][y];
    }
    for(int p = 1; p <= n; p ++)
    {
        for(int i = 1; i <= n; i ++)
        {
            for(int j = 1; j <= n; j ++)
            {
                w[i][j] = min(w[i][j], w[i][p]+w[p][j]);
            }
            for(int j = 1; j <= k; j ++)
            {
                if(s[p][j] == -1 || b[i][j] == -1)continue;
                c[i][p] = max(c[i][p], s[p][j]-b[i][j]);
            }
        }
    }
    //for(int i = 1; i <= n; i ++)for(int j = 1; j <= n; j ++)cout << w[i][j] << " " << c[i][j] << '\n';
    ll lf = 1, rt = mod, mid;
    while(lf <= rt)
    {
        mid = (lf + rt) / 2;
        if(check(mid))lf = mid + 1;
        else rt = mid - 1;
    }
    cout << rt;
}
int main()
{
    if(fopen(task".in", "r"))
    {
       freopen(task".in", "r", stdin);
       freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int ntest = 1;
    //cin >> ntest;
    while(ntest -- > 0)
    sol();
}
/*
4 5 2
10 9 5 2
6 4 20 15
9 7 10 9
-1 -1 16 11
1 2 3
2 3 3
1 4 1
4 3 1
3 1 1

*/

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:103:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |        freopen(task".in", "r", stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:104:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |        freopen(task".out", "w", stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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