Submission #314990

#	Time	Username	Problem	Language	Result	Execution time	Memory
314990		VROOM_VARUN	Crocodile's Underground City (IOI11_crocodile)	C++14	0 / 100	1 ms	384 KiB

crocodile

/*
ID: varunra2
LANG: C++
TASK: crocodile
*/

#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
  cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif

#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second

const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions

int travel_plan(int n, int m, int r[][2], int l[], int k, int p[]) {
  vector<bool> ext(n, false);
  vector<VII> adj(n);
  for (int i = 0; i < m; i++) {
    int u, v, w;
    u = r[i][0];
    v = r[i][1];
    w = l[i];
    adj[u].PB(MP(v, w));
    adj[v].PB(MP(u, w));
  }
  for (int i = 0; i < k; i++) {
    ext[p[i]] = true;
  }

  priority_queue<PII, VII, greater<PII>> pq;

  VI cnt(n, 2);

  VI dist(n, INF);

  for (int i = 0; i < n; i++) {
    if (ext[i]) {
      pq.push(MP(0, i));
    }
  }

  vector<priority_queue<int>> dists(n);

  while (!pq.empty()) {
    int u, w;
    u = pq.top().y;
    w = pq.top().x;
    pq.pop();
    trav(x, adj[u]) {
      if (sz(dists[x.x]) < 2)
        dists[x.x].push(w + x.y);
      else if (dists[x.x].top() > w + x.y) {
        dists[x.x].pop();
        dists[x.x].push(w + x.y);
      }
      if (sz(dists[x.x]) >= 2 and dist[x.x] > dists[x.x].top()) {
        dist[x.x] = dists[x.x].top();
        pq.push(MP(dist[x.x], x.x));
      }
    }
  }

  return dists[0].top();
}

// int main() {
// #ifndef ONLINE_JUDGE
//   freopen("crocodile.in", "r", stdin);
//   freopen("crocodile.out", "w", stdout);
// #endif
//   cin.sync_with_stdio(0);
//   cin.tie(0);

//   int n, m, k;

//   cin >> n >> m >> k;

//   int r[m][2];
//   int l[m];
//   int p[k];

//   for (int i = 0; i < m; i++) {
//     cin >> r[i][0] >> r[i][1] >> l[i];
//   }

//   for (int i = 0; i < k; i++) {
//     cin >> p[i];
//   }

//   int x = travel_plan(n, m, r, l, k, p);

//   debug(x);

//   return 0;
// }

• Subtask 1: 0 / 46
• Subtask 2: 0 / 43
• Subtask 3: 0 / 11