Submission #786120

#	Time	Username	Problem	Language	Result	Execution time	Memory
786120		makanhulia	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	1095 ms	31068 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
const ll MAXN = 3e4 + 5;

ll n, m, ans = -1, awal, tujuan;

vector<ll> baris[MAXN];
// bool visited[MAXN][MAXN];
map<pll, bool> visited;

void bfs() {
  queue<pair<pll, ll>> que;
  // {{Idx Baris, Lompat}, Dist}

  for (int i = 0; i < baris[awal].size(); ++i)
  {
    que.push({{awal, baris[awal][i]}, 0});
  }

  while(!que.empty()) {
    pair<pll, ll> now = que.front();
    // {{Idx Baris, Lompat}, Dist}
    que.pop();

    if (visited[now.first])
    {
      continue ;
    }
    visited[now.first] = true;

    if (now.first.first == tujuan)
    {
      ans = now.second;
      return ;
    }

    ll lompat = now.first.second;
    ll nxt = now.first.first + lompat;

    if (nxt < n && !visited[{nxt, lompat}])
    {
      que.push({{nxt, lompat}, now.second+1});
    }

    nxt = now.first.first - lompat;
    if (nxt >= 0 && !visited[{nxt, lompat}])
    {
      que.push({{nxt, lompat}, now.second+1});
    }

    vector<ll> barisNow = baris[now.first.first];
    for (int i = 0; i < barisNow.size(); ++i)
    {
      lompat = barisNow[i];
      nxt = now.first.first + lompat;

      if (nxt < n && !visited[{nxt, lompat}])
      {
        que.push({{nxt, lompat}, now.second+1});
      }

      nxt = now.first.first - lompat;
      if (nxt >= 0 && !visited[{nxt, lompat}])
      {
        que.push({{nxt, lompat}, now.second+1});
      }
    }
  }
}

int main(){
  cin >> n >> m;
  for (int i = 0; i < m; ++i)
  {
    ll tmpa, tmpb;
    cin >> tmpa >> tmpb;
    baris[tmpa].push_back(tmpb);

    if (i == 0) {
      awal = tmpa;
    } else if (i == 1) {
      tujuan = tmpa;
    }
  }

  bfs();

  cout << ans << "\n";
  return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'void bfs()':
skyscraper.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for (int i = 0; i < baris[awal].size(); ++i)
      |                   ~~^~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < barisNow.size(); ++i)
      |                     ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43