Submission #95274

#	Time	Username	Problem	Language	Result	Execution time	Memory
95274		karma	Ferries (NOI13_ferries)	C++11	40 / 40	267 ms	32044 KiB

ferries

#include<bits/stdc++.h>
#define For(i, a, b)  for(int i = a, _b = b; i <= _b; ++i)
#define Ford(i, a, b) for(int i = a, _b = b; i >= _b; --i)
#define FileName      "test"
#define ll            long long
#define ld            long double
#define ull           unsigned long long
#define Print(x)      cerr << #x << "is " << x << '\n';
#define pb            push_back
#define X             first
#define Y             second
//#define Karma
 
using namespace std;
 
template<typename T> inline void Cin(T &x)
{
    char c;
    T sign = 1;
    x = 0;
    for (c = getchar(); c < '0' || c > '9'; c = getchar())
        if (c == '-') sign = -1;
    for (; c >= '0' && c <= '9'; c = getchar())
        x = x * 10 + c - '0';
    x *= sign;
}
template <typename T> inline void Out(T x) {if(x > 9) Out(x / 10); putchar(x % 10 + '0');}
template <typename T> inline void Cout(T x, char c) {if(x < 0) putchar('-'); x = abs(x); Out(x); putchar(c);}
template <typename T, typename... Args> inline void Cin(T& a, Args&... args) {Cin(a);Cin(args...);}
template <typename T, typename... Args> inline void Cout(T a, char c, Args... args) {Cout(a, c);Cout(args...);}
 
typedef pair<ll, int> pii;
const int N = 3e5 + 7;
const ll oo = 1e18 + 7;
 
vector<int> a[N];
priority_queue<ll> c[N];
priority_queue<pii, vector<pii>, greater<pii>> pq;
int n, m, u, v;
ll w, d[N];
 
void Enter()
{
     Cin(n, m);
     while(m --)
     {
        Cin(u, v, w);
        c[u].push(w), a[v].emplace_back(u);
     }
}
 
void Solve()
{
     fill_n(d, n + 1, oo);
     d[n] = 0;
     pq.push({0, n});
     while(!pq.empty())
     {
          pii top = pq.top();
          pq.pop();
          if(d[top.Y] != top.X) continue;
          int u = top.Y;
          for(int v: a[u])
          {
              if(c[v].size())
              {
                  ll w = c[v].top();
                  c[v].pop();
                  if(d[v] > d[u] + w)
                  {
                      d[v] = d[u] + w;
                      pq.push({d[v], v});
                  }
              }
          }
     }
     cout << d[1];
}
 
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
#ifdef Karma
    freopen(FileName".inp", "r", stdin);
    freopen(FileName".out", "w", stdout);
#endif // Karma
 
    Enter();
    Solve();
 
    return 0;
}
 

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12