Submission #374227

#	Time	Username	Problem	Language	Result	Execution time	Memory
374227		ivan_tudor	Travelling Merchant (APIO17_merchant)	C++14	0 / 100	4 ms	748 KiB

merchant

#include<bits/stdc++.h>
using namespace std;
const long long N = 105;
long long mind[N][N];
long long maxp[N][N];
double newc[N][N];
long long b[N][1005];
long long s[N][1005];
double dst[N];
long long n;
bool check(double R){
  if(R == 0.5)
    cerr<<"-1\n";;
  for(long long i =1 ; i<=n;i++)
    for(long long j =1 ; j<=n;j++){
      if(mind[i][j] == LLONG_MAX)
        newc[i][j] = INT_MAX;
      else
        newc[i][j] = 1.0 * R * mind[i][j] - maxp[i][j];
    }
  for(long long i=1;i<=n;i++)
    dst[i] = INT_MAX;
  dst[1] = 0;
  for(long long nr = 1; nr <n;nr++){
    for(long long i = 1; i<=n;i++)
      for(long long j =1 ; j<=n;j++){
        if(newc[i][j] != INT_MAX && dst[i] != INT_MAX && dst[i] + newc[i][j] < dst[j])
          dst[j] = dst[i] + newc[i][j];
      }
  }
  for(long long i =1 ; i<=n;i++){
    for(long long j =1 ; j<=n;j++)
      if(newc[i][j] != INT_MAX && dst[i] != INT_MAX && dst[i] + newc[i][j] < dst[j])
          return true;
  }
  return false;
}
int main()
{
  freopen(".in","r",stdin);
  ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  long long m, k;
  cin>>n>>m>>k;
  for(long long i=1;i<=n;i++){
    for(long long j = 1; j<=k;j++)
      cin>>b[i][j]>>s[i][j];
  }
  for(long long i = 1; i<=n;i++)
    for(long long j = 1; j<=n;j++)
      mind[i][j] = LLONG_MAX;
  for(long long i = 1; i<=n;i++)
    mind[i][i] = 0;
  for(long long i = 1; i<=m;i++){
    long long x, y, d;
    cin>>x>>y>>d;
    mind[x][y] = d;
  }
  for(long long k = 1 ; k<=n;k++){
    for(long long i =1 ; i<=n;i++)
      for(long long j =1 ; j<=n;j++){
        if(mind[i][k] != LLONG_MAX && mind[k][j] != LLONG_MAX && mind[i][j] > mind[i][k] + mind[k][j])
          mind[i][j] = mind[i][k] + mind[k][j];
      }
  }
  for(long long i = 1; i<=n;i++){
    for(long long j = 1; j<=n;j++){
      maxp[i][j] = 0;
      for(long long l = 1; l<=k;l++){
        if(b[i][l] == -1 || s[j][l] == -1)
          continue;
        maxp[i][j] = max(maxp[i][j], s[j][l] - b[i][l]);
      }
    }
  }
  long long pas = -1LL<<49;
  for(long long p2 = 1LL<<50; p2 > 0; p2/=2){
    if(check(pas + p2))
      pas +=p2;
  }
  if(check(pas + 0.999999) == true)
    pas++;
  cout<<pas;
  return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:40:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   40 |   freopen(".in","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~

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