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Submission #778119

# Submission time Handle Problem Language Result Execution time Memory
778119 2023-07-10T06:26:53 Z NeroZein Highway Tolls (IOI18_highway) C++17
5 / 100
 193 ms 262144 KB 
#include "highway.h"
#include "bits/stdc++.h"
using namespace std; 
 
int n, m;
vector<int> pe;
vector<int> dep;
vector<vector<pair<int,int>>> g; 
 
void Dfs (int v, int p) {
  for (auto [u, i] : g[v]) {
    if (u == p) {
      continue;
    }
    pe[u] = i; 
    dep[u] = dep[v] + 1; 
    Dfs(u, v); 
  }
}
 
void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
  n = N;
  g.resize(n); 
  pe.resize(n); 
  dep.resize(n); 
  m = (int) U.size(); 
  for (int i = 0; i < m; ++i) {
    g[U[i]].push_back({V[i], i});
    g[V[i]].push_back({U[i], i});
  }
  Dfs(0, 0); 
  vector<int> vec; 
  vector<int> w(m, 0); 
  int dis = ask(w); 
  int depT = dis / A;
  assert(depT != 0); 
  for (int i = 0; i < n; ++i) {
    if (dep[i] == depT) {
      vec.push_back(i); 
    }
  }
  auto fix = [&](vector<int> nodes) {
    vector<int> ret(m);
    for (int u : nodes) {
      ret[pe[u]] = true; 
    }
    return ret;
  }; 
  while (vec.size() > 1) {
    vector<int> lx, rx;
    int mid = (int) vec.size() / 2;
    for (int i = 0; i < mid; ++i) {
      lx.push_back(vec[i]);
    }
    for (int i = mid; i < (int) vec.size(); ++i) {
      rx.push_back(vec[i]); 
    }
    if (ask(fix(lx)) > dis) {
      vec = lx;
    } else {
      vec = rx; 
    }
  }
  assert(!vec.empty());
  answer(0, vec[0]);//S, T
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 208 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 0 ms 208 KB Output is correct
6 Correct 0 ms 208 KB Output is correct
7 Correct 0 ms 208 KB Output is correct
8 Correct 0 ms 208 KB Output is correct
9 Correct 0 ms 208 KB Output is correct
10 Correct 0 ms 208 KB Output is correct
11 Correct 1 ms 208 KB Output is correct
12 Correct 1 ms 208 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 7 ms 1232 KB Output is correct
3 Correct 74 ms 8728 KB Output is correct
4 Correct 81 ms 8700 KB Output is correct
5 Correct 60 ms 8716 KB Output is correct
6 Correct 60 ms 8632 KB Output is correct
7 Correct 77 ms 8668 KB Output is correct
8 Correct 77 ms 8684 KB Output is correct
9 Correct 96 ms 8668 KB Output is correct
10 Correct 100 ms 8676 KB Output is correct
11 Correct 78 ms 9084 KB Output is correct
12 Correct 63 ms 9472 KB Output is correct
13 Correct 84 ms 9144 KB Output is correct
14 Incorrect 89 ms 8672 KB Output is incorrect: {s, t} is wrong.
15 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 1488 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 336 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 193 ms 262144 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Runtime error 183 ms 262144 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -