Submission #743720

#	Time	Username	Problem	Language	Result	Execution time	Memory
743720		grogu	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	75 ms	5400 KiB

merchant

#define here cerr<<"===========================================\n"
#include <bits/stdc++.h>
#define ld double
#define ll long long
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
using namespace std;
#define maxn 105
#define maxk 10005
ll n,m,k;
ll a[maxn][maxk];
ll b[maxn][maxk];
ll p[maxn][maxk];
ll d[maxn][maxn];
ll c[maxn][maxn];
bool ok(ll x){
  for(ll i = 1;i<=n;i++) for(ll j = 1;j<=n;j++) c[i][j] = -(x*min(llinf/x,d[i][j]) - p[i][j]);
  for(ll f = 1;f<=n;f++) for(ll i = 1;i<=n;i++) for(ll j = 1;j<=n;j++) c[i][j] = max(c[i][j],c[i][f]+c[f][j]);
  for(ll i = 1;i<=n;i++) if(c[i][i]>=0) return 1;
  return 0;
}
ll bs(){
  ll l = 1,r = 1000000000,mid,rez;
  while(l<=r){
    mid = (l+r)/2;
    if(ok(mid)){
      l = mid + 1;
      rez = mid;
    }else r = mid - 1;
  }
  return rez;
}
int main(){
  ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
  cin >> n >> m >> k;
  for(ll i = 1;i<=n;i++) for(ll j = 1;j<=n;j++) d[i][j] = llinf;
  //for(ll i = 1;i<=n;i++) d[i][i] = 0;
  for(ll i = 1;i<=n;i++) for(ll j = 1;j<=k;j++) cin >> a[i][j] >> b[i][j];
  for(ll f = 1;f<=k;f++) for(ll i = 1;i<=n;i++) for(ll j = 1;j<=n;j++) if(a[i][f]!=-1&&b[j][f]!=-1) p[i][j] = max(p[i][j],b[j][f]-a[i][f]);
  for(ll i = 1;i<=m;i++){
    ll x,y; cin >> x >> y;
    cin >> d[x][y];
  }
  for(ll f = 1;f<=n;f++){
    for(ll i = 1;i<=n;i++){
      for(ll j = 1;j<=n;j++){
        d[i][j] = min(d[i][j],d[i][f] + d[f][j]);
      }
    }
  }
  cout<<bs()<<endl;
  return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'long long int bs()':
merchant.cpp:44:10: warning: 'rez' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |   return rez;
      |          ^~~

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