Submission #292683

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
292683	2020-09-07T11:44:17 Z	Haunted_Cpp	Simurgh (IOI17_simurgh)	C++17	Compilation error	0 ms	0 KB

simurgh

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


vector<vector<pair<int, int>>> g(MAX_N);
bitset<MAX_N> vis;

vector<int> span, par, s, best_way, u, v;

int n;

void reset() {
  for (int i = 0; i < n; i++) {
    par[i] = i;
    s[i] = 1;
  }
}

int root(int x) {
  if (x == par[x]) return x;
  return par[x] = root(par[x]);
}

void join(int a, int b) {
  a = root(a);
  b = root(b);
  if (a == b) return;
  if (s[a] < s[b]) swap(a, b);
  par[b] = a;
  s[a] += s[b];
}

bool is(int a, int b) {
  return root(a) == root(b);
}

bool works() {
  for (auto to : span) {
    const int st = u[to];
    const int et = v[to];
    if (is(st, et)) return false;
    join(st, et);
  }
  return true;
}

const int MAX_N = 240 + 5;


void get_any(int node) {
  vis[node] = 1;
  for (auto [nxt, to] : g[node]) {
    if (!vis[nxt]) {
      vis[nxt] = 1;
      span.emplace_back(to);
      get_any(nxt);
    }
  }  
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
  ::n = n;
  ::u = u;
  ::v = v;
  const int m = v.size();
  const int t = n - 1;
  par = s = vector<int>(n);
  for (int i = 0; i < m; i++) {
    const int st = u[i];
    const int et = v[i];
    g[st].emplace_back(et, i);
    g[et].emplace_back(st, i);
  }
  get_any(0);
  int score = count_common_roads(span);
  if (score == t) {
    return span;
  }
  for (auto &edge : span) {
    int starting_edge = edge;
    bool swap = false;
    for (int i = 0; i < m; i++) {
      reset();
      edge = i;
      if(!works()) {
        continue;
      }
      int nxt_score = count_common_roads(span);
      if (nxt_score > score) {
        score = nxt_score;
        assert(edge == i);
        swap = true;
        break;
      }
    }
    if (score == t) {
      return span;
    }
    if (!swap) {
      edge = starting_edge;
    }
  }
  return span;
}

Compilation message

simurgh.cpp:6:34: error: 'MAX_N' was not declared in this scope
    6 | vector<vector<pair<int, int>>> g(MAX_N);
      |                                  ^~~~~
simurgh.cpp:7:8: error: 'MAX_N' was not declared in this scope
    7 | bitset<MAX_N> vis;
      |        ^~~~~
simurgh.cpp:7:13: error: template argument 1 is invalid
    7 | bitset<MAX_N> vis;
      |             ^
simurgh.cpp: In function 'void get_any(int)':
simurgh.cpp:52:11: error: invalid types 'int[int]' for array subscript
   52 |   vis[node] = 1;
      |           ^
simurgh.cpp:54:17: error: invalid types 'int[std::tuple_element<0, std::pair<int, int> >::type {aka int}]' for array subscript
   54 |     if (!vis[nxt]) {
      |                 ^
simurgh.cpp:55:14: error: invalid types 'int[std::tuple_element<0, std::pair<int, int> >::type {aka int}]' for array subscript
   55 |       vis[nxt] = 1;
      |              ^