Submission #19387114

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Source Code Expand

//SAGAR SINGH

#include<bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio;cin.tie(NULL);cout.tie(0);
#define ll long long 
#define ld long double 
#define rep(i,a,b) for(ll i=a;i<b;i++) //rep(i,0,n) 
#define repr(i,a,b) for(ll i=a;i>=b;i--)//repr(i,n-1,0)
#define repit(it,a) for(auto it=(a).begin();it!=(a).end();it++)//repr(i,n,0)
#define vll vector<long long>
#define vpl vector<pair<ll,ll> >
#define sll set<long long>
#define msll multiset<long long>
#define mll map<ll,ll>
#define mmll multimap<ll,ll>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define get(x) getline(cin,x)
#define in(v) for(auto &x:v) cin>>x;
#define out(v) for(auto x:v) {cout<<x<<" ";} cout<<"\n";
#define str string
#define pb  push_back
#define ins insert
#define lb lower_bound
#define ub upper_bound
#define ff first
#define ss second
#define mod 1000000007
#define maxx 1e7+7
/*--- bit-stuff ----*/
#define setbits(a) ( __builtin_popcountll(a))
#define right(a) (__builtin_ctzll(a))
#define left(a) (__builtin_clzll(a))
#define parity(a) (__builtin_parityll(a))

#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
    template <typename Arg1>
    void __f(const char* name, Arg1&& arg1){
        cout << name << " : " << arg1 << endl;
        //use cerr if u want to display at the bottom
    }
    template <typename Arg1, typename... Args>
    void __f(const char* names, Arg1&& arg1, Args&&... args){
        const char* comma = strchr(names + 1, ','); cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
    }
#else
#define trace(...)
#endif

vll adj[200001];
bool visited[200001];
void dfs(ll u ) {
     
    visited[u] = 1;
    for (ll v : adj[u]) {
        if (!visited[v])
            dfs(v );
    }
}

int main(){
   fastio
  #ifndef ONLINE_JUDGE
   freopen("input.txt","r",stdin);
   freopen("output.txt","w",stdout);
  #endif

// ll t;cin>>t;while(t--){

ll n;cin>>n;
sll s;
rep(i,0,n){
  ll x,y;cin>>x>>y;
  s.ins(x);
  s.ins(y);
  adj[x].pb(y);
  adj[y].pb(x);
}
ll c=0;
// ll trees=0;

for(auto x:s){
if(!visited[x])
{
  dfs(x);
  c++;
}
}
// trace(c,s.size());
if(c==1&&(n==((s.size())-1))) cout <<s.size()-1;
else cout<<s.size();









 
 


// }

#ifndef ONLINE_JUDGE
   cout<<"\n\n\nTime lap: "<<1.0*clock()/CLOCKS_PER_SEC<<" sec\n";
  #endif
return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:5:26: warning: statement is a reference, not call, to function ‘std::ios_base::sync_with_stdio’ [-Waddress]
    5 | #define fastio ios_base::sync_with_stdio;cin.tie(NULL);cout.tie(0);
      |                ~~~~~~~~~~^~~~~~~~~~~~~~~
./Main.cpp:65:4: note: in expansion of macro ‘fastio’
   65 |    fastio
      |    ^~~~~~
./Main.cpp:5:26: warning: statement has no effect [-Wunused-value]
    5 | #define fastio ios_base::sync_with_stdio;cin.tie(NULL);cout.tie(0);
      |                ~~~~~~~~~~^~~~~~~~~~~~~~~
./Main.cpp:65:4: note: in expansion of macro ‘fastio’
   65 |    fastio
      |    ^~~~~~
./Main.cpp:93:12: warning: comparison of integer expressions of different signedness: ‘long long int’ and ‘std::set<long long int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   93 | if(c==1&&(n==((s.size())-1))) cout <<s.size()-1;
      |           ~^~~~~~~~~~~~~~~~

Judge Result