Submission #374217

#	Time	Username	Problem	Language	Result	Execution time	Memory
374217		ivan_tudor	Travelling Merchant (APIO17_merchant)	C++14	0 / 100	89 ms	3436 KiB

merchant

#include<bits/stdc++.h>
using namespace std;
const long long N = 105;
long long mind[N][N];
long long maxp[N][N];
long long newc[N][N];
long long b[N][1005];
long long s[N][1005];
long long dst[N];
long long n;
bool check(long long R){
  for(long long i =1 ; i<=n;i++)
    for(long long j =1 ; j<=n;j++)
      newc[i][j] = maxp[i][j] - R * mind[i][j];
  for(long long i=1;i<=n;i++)
    dst[i] = 1LL<<60;
  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(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(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] = 1<<28;
  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][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 l = 0, r = 1<<30;
  while(l < r){
    long long mid = (l + r)/2;
    if(check(mid))
      r = mid;
    else
      l = mid + 1;
  }
  cout<<l + 1;
  return 0;
}

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