Submission #200294

#	Time	Username	Problem	Language	Result	Execution time	Memory
200294		BThero	Travelling Merchant (APIO17_merchant)	C++17	0 / 100	1104 ms	159992 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)1e15;
const int INF = (int)1e9 + 7;

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

ll dp[MAXN * 2][MAXN][MAXK];

int adj[MAXN][MAXN];

int n, m, k;

bool check(int x) {
    for (int st = 1; st <= n; ++st) {
        for (int len = 0; len <= 2 * n; ++len) {
            for (int i = 1; i <= n; ++i) {
                for (int j = 0; j <= k; ++j) {
                    dp[len][i][j] = -LINF;
                }
            }
        }

        dp[0][st][0] = 0;

        for (int len = 0; len <= 2 * n; ++len) {
            for (int v = 1; v <= n; ++v) {
                for (int i = 1; i <= k; ++i) {
                    if (dp[len][v][i] != -LINF) {
                        if (sell[v][i] != -1) {
                            dp[len][v][0] = max(dp[len][v][0], dp[len][v][i] + sell[v][i]);
                        }                        
                    }
                }

                if (dp[len][v][0] != -LINF) {
                    for (int i = 1; i <= k; ++i) {
                        if (buy[v][i] != -1) {
                            dp[len][v][i] = max(dp[len][v][i], dp[len][v][0] - buy[v][i]);
                        }
                    }
                }

                for (int i = 0; i <= k; ++i) {
                    if (dp[len][v][i] == -LINF) {
                        continue;
                    }

                    for (int to = 1; to <= n; ++to) {
                        int w = adj[v][to];    

                        if (w != INF) {
                            dp[len + 1][to][i] = max(dp[len + 1][to][i], dp[len][v][i] - w * 1ll * x);                            
                        }
                    }                                        
                }                
            }
        }

        for (int i = 1; i <= 2 * n; ++i) {
            for (int j = 0; j <= k; ++j) {
                if (dp[i][st][j] >= 0) {
                    return 1;
                }                
            }
        }
    }

    return 0;        
}

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] = INF;
        }
    }

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

    ll l = 1, r = (ll)1e10, ans = 0;

    while (l <= r) {
        ll mid = (l + r) >> 1;

        if (check(mid)) {
            ans = mid;
            l = mid + 1;
        }
        else {
            r = mid - 1;
        }
    }

    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:95:10: 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:99:18: 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:111:14: 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: 0 / 12
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 34