Submission #522242

#	Time	Username	Problem	Language	Result	Execution time	Memory
522242		ddy888	Travelling Merchant (APIO17_merchant)	C++17	0 / 100	27 ms	1820 KiB

merchant

// code storage

#undef _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long 
#define pb push_back
#define fi first
#define si second
#define ar array
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;  
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {cerr << " " << to_string(H);debug_out(T...);}
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)

const int INF = 1e9;
int N, M, K;
int B[110][110], S[110][110], profit[110][110];
vector<vector<int> > dist;

void apsp(vector<vector<int> > V) {
    for (int k = 1; k <= N; ++k) {
        for (int i = 1; i <= N; ++i) {
            for (int j = 1; j <= N; ++j) {
                V[i][j] = min(V[i][j], V[i][k] + V[k][j]);
            }
        }
    }
}

bool good(int x) {
    // check profit - x * time >= 0
    vector<vector<int> > V = dist;
    for (int i = 1; i <= N; ++i) {
        for (int j = 1; j <= N; ++j) {
            if (dist[i][j] == INF) continue;
            V[i][j] = profit[i][j] - dist[i][j] * x;
            debug(V[i][j]);
        }
    }
    apsp(V);
    for (int i = 1; i <= N; ++i) {
        debug(V[i][i], i);
        if (V[i][i] == INF || V[i][i] == 0) continue;
        if (V[i][i] >= 0) return 1;
    }
    return 0;
}

signed main() {
    fast;
    cin >> N >> M >> K;
    dist.resize(N + 1, vector<int>(N + 1, INF));
    for (int i = 1; i <= N; ++i) {
        for (int j = 1; j <= K; ++j) {
            cin >> B[i][j] >> S[i][j];
        }
    }
    for (int i = 1; i <= M; ++i) {
        int u, v, c; cin >> u >> v >> c;
        dist[u][v] = c;
    }
    apsp(dist);
    for (int i = 1; i <= N; ++i) {
        for (int j = 1; j <= N; ++j) {
            for (int k = 1; k <= K; ++k) {
                if (B[i][k] == -1 || S[j][k] == -1) continue;
                profit[i][j] = max(profit[i][j], S[j][k] - B[i][k]);
            }
        }
    }
    // int lo = 0, hi = 1e12;
    // while (lo + 1 < hi) {
    //     int mid = (lo + hi) / 2;
    //     if (good(mid)) lo = mid;
    //     else hi = mid;
    // }
    // cout << lo;
    return 0;
}

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