oj.uz

Submission #535247

# Submission time Handle Problem Language Result Execution time Memory
535247 2022-03-09T18:21:31 Z NaimSS 007 (CEOI14_007) C++14
100 / 100
 232 ms 16960 KB 
#include <bits/stdc++.h>
#define ld long double
#define endl "\n"
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pb push_back
#define mp(a,b) make_pair(a,b)
#define ms(v,x) memset(v,x,sizeof(v))
#define all(v) v.begin(),v.end()
#define ff first
#define ss second
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define per(i, a, b) for(int i = b-1; i>=a ; i--)
#define trav(a, x) for(auto& a : x)
#define allin(a , x) for(auto a : x)
#define Unique(v) sort(all(v));v.erase(unique(all(v)),v.end());
#define sz(v) ((int)v.size())
using namespace std;
typedef vector<int> vi;
#define y1 abacaba
//#define left oooooopss
#define db(x) cerr << #x <<" == "<<x << endl;
#define db2(x,y) cerr<<#x <<" == "<<x<<", "<<#y<<" == "<<y<<endl;
#define db3(x,y,z) cerr << #x<<" == "<<x<<", "<<#y<<" == "<<y<<", "<<#z<<" == "<<z<<endl;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<ll> vl;
std::mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
inline ll mod(ll n, ll m ){ ll ret = n%m; if(ret < 0) ret += m; return ret; }
ll gcd(ll a, ll b){return (b == 0LL ? a : gcd(b, a%b));}
ll exp(ll b,ll e,ll m){
  b%=m;
  ll ans = 1;
  for (; e; b = b * b % m, e /= 2)
      if (e & 1) ans = ans * b % m;
  return ans;
}

// debug:
void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T){ 
  cerr << ' ' << H; 
  dbg_out(T...); 
}
#ifdef LOCAL
#define dbg(...) cerr<<"(" << #__VA_ARGS__<<"):" , dbg_out(__VA_ARGS__) , cerr << endl
#else
#define dbg(...) 42
#endif
//

const int N = 200100;
    int n,m;

vi g[N];

vi dista(int a){
  vector<int> d(n+2);
  rep(i,1,n+1)d[i] = 1e9;
  d[a] = 0;
  priority_queue<pii,vector<pii>,greater<pii>> pq;
  pq.push(pii(d[a],a));
  while(!pq.empty()){
    auto t = pq.top();pq.pop();
    if(t.ff != d[t.ss])continue;
    int v = t.ss;
    for(auto to : g[v])if(d[to] > d[v] + 1){
      d[to] = d[v] + 1;
      pq.push(pii(d[to],to));
    }
  }
  return d;
}

int s,d,a,b;
vi d1,d2;
int vis[N];
int getcommon(int ini){
  rep(i,0,N)vis[i]=0;
  queue<int> q;
  q.push(ini);
  vis[ini] = 1;
  int res=0;
  while(!q.empty()){
    int v = q.front();
    q.pop();
    res=max(res,d1[ini] - d1[v]);
    for(auto to : g[v])
    if(!vis[to] && d1[to] == d1[v] - 1 && d2[to] == d2[v] - 1){
      vis[to]=1;q.push(to);
    }
  }
  return res;
}

int32_t main(){
    fastio;
    cin >> n >> m;
    cin >> s >> d >> a >> b;
    assert(a!=b);
    while(m--){
      int u,v;
      cin >> u >> v;
      g[u].pb(v);
      g[v].pb(u);
    }
    d1 = dista(a),d2=dista(b);
    int A = d1[d] - d1[s];
    int B = d2[d] - d2[s];
    if(A!=B){
      cout << max(min(A,B),-1) << endl;
    }else{
      cout << max(A - ((A + getcommon(s) < getcommon(d)) ? 1 : 0),-1) << endl;
    }
    // math -> gcd it all
    // Did u check N=1? Did you switch N,M?
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 5708 KB Output is correct
3 Correct 3 ms 5708 KB Output is correct
4 Correct 3 ms 5708 KB Output is correct
5 Correct 3 ms 5708 KB Output is correct
6 Correct 3 ms 5708 KB Output is correct
7 Correct 3 ms 5708 KB Output is correct
8 Correct 3 ms 5708 KB Output is correct
9 Correct 4 ms 5708 KB Output is correct
10 Correct 3 ms 5004 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 5708 KB Output is correct
13 Correct 3 ms 5708 KB Output is correct
14 Correct 3 ms 5708 KB Output is correct
15 Correct 3 ms 5708 KB Output is correct
16 Correct 4 ms 5708 KB Output is correct
17 Correct 3 ms 5708 KB Output is correct
18 Correct 3 ms 5708 KB Output is correct
19 Correct 3 ms 5708 KB Output is correct
20 Correct 3 ms 5708 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 3 ms 5708 KB Output is correct
23 Correct 3 ms 5708 KB Output is correct
24 Correct 4 ms 5836 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 7372 KB Output is correct
2 Correct 27 ms 8116 KB Output is correct
3 Correct 23 ms 7484 KB Output is correct
4 Correct 27 ms 8100 KB Output is correct
5 Correct 21 ms 6544 KB Output is correct
6 Correct 20 ms 6732 KB Output is correct
7 Correct 25 ms 7624 KB Output is correct
8 Correct 35 ms 7684 KB Output is correct
9 Correct 37 ms 8220 KB Output is correct
10 Correct 117 ms 12484 KB Output is correct
11 Correct 51 ms 9284 KB Output is correct
12 Correct 67 ms 10272 KB Output is correct
13 Correct 54 ms 9628 KB Output is correct
14 Correct 50 ms 9084 KB Output is correct
15 Correct 64 ms 10256 KB Output is correct
16 Correct 63 ms 9776 KB Output is correct
17 Correct 64 ms 10036 KB Output is correct
18 Correct 58 ms 10048 KB Output is correct
19 Correct 91 ms 11184 KB Output is correct
20 Correct 146 ms 14056 KB Output is correct
21 Correct 84 ms 12228 KB Output is correct
22 Correct 80 ms 11204 KB Output is correct
23 Correct 83 ms 11924 KB Output is correct
24 Correct 73 ms 11868 KB Output is correct
25 Correct 77 ms 11516 KB Output is correct
26 Correct 82 ms 11264 KB Output is correct
27 Correct 93 ms 12028 KB Output is correct
28 Correct 101 ms 11972 KB Output is correct
29 Correct 121 ms 12584 KB Output is correct
30 Correct 166 ms 14716 KB Output is correct
31 Correct 95 ms 12924 KB Output is correct
32 Correct 95 ms 12020 KB Output is correct
33 Correct 94 ms 12212 KB Output is correct
34 Correct 124 ms 12484 KB Output is correct
35 Correct 80 ms 12228 KB Output is correct
36 Correct 85 ms 12576 KB Output is correct
37 Correct 111 ms 12644 KB Output is correct
38 Correct 110 ms 13124 KB Output is correct
39 Correct 122 ms 13244 KB Output is correct
40 Correct 162 ms 14788 KB Output is correct
41 Correct 232 ms 16960 KB Output is correct