Submission #166146

#	Time	Username	Problem	Language	Result	Execution time	Memory
166146		imaxblue	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	273 ms	3448 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define vi vector<int>
#define vpii vector<pii>
#define vp3i vector<p3i>
#define vpll vector<pll>
#define vp3l vector<p3l>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() ((rand() << 14)+rand())
#define scan(X) do{while((X=getchar())<'0'); for(X-='0'; '0'<=(_=getchar()); X=(X<<3)+(X<<1)+_-'0');}while(0)
char _;
#define pi 3.14159265358979323846
#define startrng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, m, k, a, c, w;
int s[105][1005], b[105][1005], best[105][105];
ll path[105][105], dp[105][105][105], path2[105][105];
bool check(int M){
  //cout << endl << ' ' << M << ' ' << endl;
  fox1(l, n){
    fox1(l2, n){
      path2[l][l2] = best[l][l2] - (path[l][l2]>(1LL<<50)/M?(1LL<<50):path[l][l2]*M);
      //cout << path2[l][l2] << ' ';
      //if (M<200 && path2[l][l2] > 0) cout << path2[l][l2] << ' ' << l << ' ' << l2 <<endl;
    }
    //if (M<200) cout << endl;
    //cout << endl;
  }
  //fox1(T, 10)
  fox1(l3, n){
    fox1(l, n){
      fox1(l2, n){
        if (path2[l][l3] < -(1LL<<50)-path2[l3][l2]) continue;
        path2[l][l2] = max(path2[l][l2], path2[l][l3] + path2[l3][l2]);
      }
    }
  }
  fox1(l, n){
    //if (M < 200) cout << path2[l][l] << ' ';
    if (path2[l][l] >= 0) return 1;
  }
  //cout << endl;
  return 0;
}
int32_t main(){
  //freopen("test.txt", "r", stdin);
  flood(path);
  scanf("%i%i%i", &n, &m, &k);
  fox1(l, n){
    fox(l2, k){
      scanf("%i%i", &b[l][l2], &s[l][l2]);
      //if (b[l][l2] == -1) b[l][l2] = (1<<30);
    }
    /*fox(l2, k){
      scanf("%i", &s[l][l2]);
      //if (s[l][l2] == -1) s[l][l2] = -(1<<30);
    }*/
  }
  fox1(l, n){
    fox1(l2, n){
      best[l][l2] = 0;
      fox(l3, k){
        if (s[l2][l3]!=-1 && b[l][l3]!=-1)
        best[l][l2] = max(best[l][l2], s[l2][l3]-b[l][l3]);
      }
    }
  }
  fox(l, m){
    scanf("%i%i%i", &a, &c, &w);
    path[a][c] = w;
  }
  ll ans = 0;
  fox1(T, n)
    fox1(l3, n){
      fox1(l, n){
        fox1(l2, n){
          path[l][l2] = min(path[l][l2], path[l][l3] + path[l3][l2]);
        }
      }
    }
  /*fox1(l, n){
    ans = max(ans, best[1][l]/(path[1][l]+path[l][1]));
    cout << best[1][l] << ' ' << path[1][l] << ' ' << path[l][1] << endl;
  }
  cout << ans; return 0;*/
  //}
  /*fox1(l, n){
    fox1(l2, n){
      cout << path[l][l2] << ' ';
    }cout << endl;
  }*/
  int lo = 0, mid, hi = 1000000000;
  while(lo<hi){
    //cout << lo << ' ' << hi << endl;
    mid=(lo+hi+1)/2;
    if (check(mid)) lo=mid;
    else hi=mid-1;
  }
  cout << lo << endl;
  return 0;
}
/*
4 5 2
10 9 5 2
6 4 20 15
9 7 10 9
-1 -1 16 11
1 2 3
2 3 3
1 4 1
4 3 1
3 1 1

4 4 1
1 1
-1 -1
-1 -1
1000000000 1000000000
1 2 1000000000
2 3 1000000000
3 4 1000000000
4 1 1000000000

4 4 1
-1 -1
-1 10
-1 20000
-1 1000000000
1 2 1
2 3 1
3 4 1
4 1 1
*/

Compilation message (stderr)

merchant.cpp: In function 'int32_t main()':
merchant.cpp:93:6: warning: unused variable 'ans' [-Wunused-variable]
   ll ans = 0;
      ^~~
merchant.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i%i%i", &n, &m, &k);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:72:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%i%i", &b[l][l2], &s[l][l2]);
       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:90:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i%i", &a, &c, &w);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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