Submission #1074995

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074995		thatsgonzalez	Senior Postmen (BOI14_postmen)	C++14	38 / 100	570 ms	15820 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> ii;
typedef vector <int> vi;
typedef vector <ll> vl;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef vector <char> vc;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vc> vvc;
typedef vector<vs> vvs;
typedef pair<ll,ll> pl;
typedef double dou;
typedef vector<pl> vpl;
typedef unsigned long long ull;
typedef uint64_t i64;
typedef vector <pair<int,ii>> graph;
typedef priority_queue<ii,vii,greater<ii>> priority_graph;
typedef vector<ull> vull;
 
#define f first 
#define s second 
#define pb push_back 
#define sz(x) int((x).size())
#define all(x) begin(x), end(x)
#define ts to_string
#define lb lower_bound 
#define ub upper_bound
#define yes cout<<'Y'<<'E'<<'S'<<endl
#define no cout<<'N'<<'O'<<endl
#define nd "\n"
 
void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
 
ll gcd(ll a, ll b) {return b == 0 ? a : gcd(b, a % b);}
ll mcm(ll a, ll b) {return (a * b) / gcd(a, b);}
bool prime(ll n) {for(int i=2; i<=sqrt(n); i++) if(n%i==0) return false; return true;}
struct compii{bool operator()(const ii &a, const ii &b){if(a.f==a.s)return a.s<b.s;return a.f>b.f;}};
bool comp(int a, int b) {return a>b;}
ll binpow(ll n, ll x){ll ans=1; while(x){if(x&1){ans*=n;}n*=n; x>>=1;} return ans;}
 
namespace operators {
template<typename T1, typename T2>istream& operator>>(istream& in, pair<T1, T2>& x){in >> x.first >> x.second;return in;}
template<typename T1, typename T2>ostream& operator<<(ostream& out, pair<T1, T2> x){out << x.first << " " << x.second;return out;}
template<typename T1>istream& operator>>(istream& in, vector<T1>& x) {for (auto& i : x) in >> i;return in;}
template<typename T1>ostream& operator<<(ostream& out, vector<T1>& x) {for (auto& i : x) out << i << " ";return out;}
template<typename T1, typename T2>ostream& operator<<(ostream& out, vector<pair <T1,T2>>& x) {for (auto& i : x) out << i.f << " "<<i.s;return out;}
template<typename T1, typename T2>istream& operator>>(istream& in, vector<pair <T1,T2>>& x) {for (auto& i : x) in >> i.f >>i.s;return in;}
}
 
using namespace operators;
 
int dx[]= {1,0,-1,0};
int dy[]= {0,1,0,-1};
 
const int mod=1e9+7;
const ll inf=1e18;
const int nmax = 5e5+10;
 
vector<vector<pair<int,int>>> g;
vi mp;
vi used;
vi vis;
bool ok = false;
bitset<nmax> bts;
 
bool dfs(int node, int src){
  //cout<<node<<endl;
  used.pb(node); bts[node] = 1; bool works = false; bool pass = false;
  for(auto &x: g[node]){
    if(mp[x.s]) continue;
    if(ok) continue;
    mp[x.s] = 1;
    pass = true;
    if(x.f == src) {
      ok = true;
      return true;
    }
    if(bts[x.f]) {
      mp[x.s] = 0;
      continue;
    }
    works = dfs(x.f,src);
    if(!works){
      mp[x.s] = 0;
    }
    else break;
 
  }
  if(!pass){
    vis[node] = 1;
  }
  if(!works) used.pop_back();
  return works;
 
}
 
void solve()
{
  int n,m; cin>>n >>m;
  g.resize(n+1);
  vis.assign(n+1,0);
  mp.assign(m,0);
  for(int i = 0; i<m; i++){
    int u,v; cin>> u >> v; 
 
    g[u].pb({v,i});
    g[v].pb({u,i});
 
  }
 
  int ind = 1;
  while(ind<=n){
    if(vis[ind]){
      ind++; continue;
    }
    dfs(ind,ind);
    if(!ok) ind++;
    else{
      /*for(auto &x: mp){
        cout<<x.f<<" "<<x.s<<endl;
      }*/
      for(auto &x: used) cout<<x<<" "; cout<<nd; 
    }
    ok = false;
    used.clear();
    bts.reset();
    //cout<<"----------------"<<endl;
  }
 
}
int main ()
{
  setIO("");
  int t=1;
  //cin>>t;
  while(t-->0) solve();
  return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'void solve()':
postmen.cpp:126:7: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  126 |       for(auto &x: used) cout<<x<<" "; cout<<nd;
      |       ^~~
postmen.cpp:126:40: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  126 |       for(auto &x: used) cout<<x<<" "; cout<<nd;
      |                                        ^~~~
postmen.cpp: In function 'void setIO(std::string)':
postmen.cpp:36:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 | void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
      |                                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
postmen.cpp:36:128: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 | void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
      |                                                                                                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 0 / 17
• Subtask 3: 0 / 45