Submission #781515

#	Time	Username	Problem	Language	Result	Execution time	Memory
781515		makanhulia	Naboj (COCI22_naboj)	C++17	0 / 110	150 ms	20848 KiB

naboj

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl "\n"
#define pii pair<ll,ll>
#define pb push_back
#define vi vector<ll>
#define pque priority_queue
#define pqueg priority_queue<ll,vector<ll>,greater<ll>>
#define que queue<ll>
#define FOR(m,i,n) for(int i=(m); i<=(n); i++)
#define FORM(m,i,n) for(int i=(m); i>=(n); i--)
ll n,m,pre,a,b;
set<ll> st;
ll temp1,temp2;
vector<ll> adj[200200],v;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> m;
  FOR(1,i,m) {
    cin >> a >> b;
    adj[a].pb(b);
    adj[b].pb(a);
    st.insert(a);
  }
  for(auto i : st) {
    v.pb(i);
  }
  if(n == 2) {
    cout << a << " 1" << endl;
    return 0;
  }
  if(st.size() < n/2 || st.size() == n-1) {
    cout << -1 << endl;
    return 0;
  }
  pre = -1;
  for(auto i : v) {
    if(pre != -1 && i - pre > 2) {
      cout << -1 << endl;
      return 0;
    } 
    pre = i;
  }
  pre = -1;
  FOR(0,i,v.size()-1) {
    if(pre != -1) {
      if(v[i] - pre != 1) {
        temp1 = i;
        break;
      }
    }
    cout << v[i] << " 1" << endl;
    pre = v[i];
  }
  pre = -1;
  FORM(v.size()-1,i,1) {
    if(pre != -1) {
      if(v[i] - pre != 1) {
        temp2 = i;
        break;
      }
    }
    cout << v[i] << " 1" << endl;
    pre = i;
  }
  FOR(temp1,i,temp2) {
    cout << v[i] << " 1" << endl;
  }
}

/*
9 8
1 2
2 3
3 4
5 4
5 6
6 7
7 8
8 9
*/

Compilation message (stderr)

naboj.cpp: In function 'int main()':
naboj.cpp:36:16: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   36 |   if(st.size() < n/2 || st.size() == n-1) {
      |      ~~~~~~~~~~^~~~~
naboj.cpp:36:35: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   36 |   if(st.size() < n/2 || st.size() == n-1) {
      |                         ~~~~~~~~~~^~~~~~
naboj.cpp:13:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 | #define FOR(m,i,n) for(int i=(m); i<=(n); i++)
      |                                    ^
naboj.cpp:49:3: note: in expansion of macro 'FOR'
   49 |   FOR(0,i,v.size()-1) {
      |   ^~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 25
• Subtask 3: 0 / 70