Submission #777135

#	Time	Username	Problem	Language	Result	Execution time	Memory
777135		Sam_a17	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	91 ms	6184 KiB

merchant

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  } else if(str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}
 
 
const long long inf = 1e12;
const int N = 505;
vector<pair<long long, long long>> adj[N];
long long s[N][3 * N], b[N][3 * N];
long long dist[N][N], d[N][N];
long long profit[N][N];
int n, m, k;

 
void solve_() {
  cin >> n >> m >> k;
 
  int flag = 1;
  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= k; j++) {
      cin >> b[i][j] >> s[i][j];
      if(i > 1 && b[i][j] != -1) {
        flag = false;
      }
    }
  }
 
  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= n; j++) {
      dist[i][j] = inf;
    }
    dist[i][i] = 0;
  }
 
  for(int i = 1; i <= m; i++) {
    long long u, v, e; cin >> u >> v >> e;
    dist[u][v] = min(dist[u][v], e);
    adj[u].emplace_back(v, e);
  }
 
  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]);

  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= n; j++) {
      for(int e = 1; e <= k; e++) {
        if(b[i][e] != -1 && s[j][e] != -1) {
          profit[i][j] = max(profit[i][j], s[j][e] - b[i][e]);
        }
      }
    }
  }

  long long ina = 1, inb = 1e12, ans = 0;
  while(ina <= inb) {
    long long mid = (ina + inb) / 2;
    for(int i = 1; i <= n; i++) {
      for(int j = 1; j <= n; j++) {
        d[i][j] = min(inf, - profit[i][j] + mid * min(inf / mid, dist[i][j]));
      }
      d[i][i] = inf;
    }

    for (int e = 1; e <= n; e++) 
      for (int i = 1; i <= n; i++) 
        for (int j = 1; j <= n; j++) 
          d[i][j] = min(d[i][j], d[i][e] + d[e][j]);

    int ok = 0;
    for(int i = 1; i <= n; i++) {
      if(d[i][i] <= 0) {
        ok = 1;
      }
    }

    if(ok) {
      ans = mid;
      ina = mid + 1;
    } else {
      inb = mid - 1;
    }
  }

  cout << ans << '\n';
} 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    for(int i = 1; i <= test_case; i++) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

merchant.cpp: In function 'void solve_()':
merchant.cpp:97:7: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
   97 |   int flag = 1;
      |       ^~~~
merchant.cpp: In function 'void setIO(std::string)':
merchant.cpp:76:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:77:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:79:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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