Submission #200323

#	Time	Username	Problem	Language	Result	Execution time	Memory
200323		BThero	Travelling Merchant (APIO17_merchant)	C++17	12 / 100	29 ms	1272 KiB

merchant

// Why am I so dumb? :c
// chrono::system_clock::now().time_since_epoch().count()
                                                  
#include<bits/stdc++.h>
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;   
typedef pair<int, int> pii;
//template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

const int MAXN = (int)1e2 + 5;
const int MAXK = (int)1e3 + 5;
const ll LINF = (ll)1e17;

int buy[MAXN][MAXK], sell[MAXN][MAXK];

ll dp[MAXN][MAXN][MAXK];

int adj[MAXN][MAXN];

ll dist[MAXN][MAXN];

int n, m, k;

ll ans;

void solve() {
    scanf("%d %d %d", &n, &m, &k);

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= k; ++j) {
            scanf("%d %d", &buy[i][j], &sell[i][j]);
        }
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= n; ++j) {
            adj[i][j] = -1;
        }
    }

    for (int i = 1; i <= m; ++i) {
        int u, v, w;
        scanf("%d %d %d", &u, &v, &w);
        adj[u][v] = w;
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= n; ++j) {            
            if (adj[i][j] == -1) {
                dist[i][j] = LINF;
            }
            else {
                dist[i][j] = adj[i][j];
            }
        }

        dist[i][i] = 0;
    }

    for (int k = 1; k <= n; ++k) {
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= n; ++j) {
                dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);                
            }
        }
    }

    ll ans = 0;

    for (int i = 2; i <= n; ++i) {
        if (dist[1][i] == LINF || dist[i][1] == LINF) {
            continue;
        }

        ll b = dist[1][i] + dist[i][1];

        for (int j = 1; j <= k; ++j) {
            if (buy[1][j] != -1 && sell[i][j] != -1) {
                ll a = sell[i][j] - buy[1][j];
                ans = max(ans, a / b);
            }
        }                   
    }

    printf("%lld\n", ans);
}

int main() {
    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'void solve()':
merchant.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &n, &m, &k);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:44:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &buy[i][j], &sell[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:56:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d", &u, &v, &w);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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