Submission #234555

#	Time	Username	Problem	Language	Result	Execution time	Memory
234555		doowey	Matching (COCI20_matching)	C++14	0 / 110	6 ms	2688 KiB

matching

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = (int)1e5 + 100;
vector<int> T[N];
vector<pii> sol;

map<int,int> xc,yc;

vector<int> ord;
bool vis[N];
void dfs(int u){
  vis[u]=true;
  ord.push_back(u);
  for(auto x : T[u]){
    if(!vis[x])dfs(x);
  }
}

int main(){
  fastIO;
  int n;
  cin >> n;
  int x, y;
  for(int i = 1 ; i <= n; i ++ ){
    cin >> x >> y;
    if(xc[x] == 0){
      xc[x]=i;
    }
    else{
      T[i].push_back(xc[x]);
      T[xc[x]].push_back(i);
    }
    if(yc[y] == 0){
      yc[y]=i;
    }
    else{
      T[i].push_back(yc[y]);
      T[yc[y]].push_back(i);
    }
  }
  vector<pii> sol;
  for(int i = 1; i <= n; i ++ ){
    if(!vis[i]){
      ord.clear();
      dfs(i);
      if((int)ord.size() % 2 == 1){
        cout << "NE\n";
        return 0;
      }
      else{
        for(int i = 0 ; i < ord.size() ; i += 2){
          sol.push_back(mp(ord[i],ord[i+1]));
        }
      }
    }
  }
  cout << "DA\n";
  for(auto x : sol)
    cout << x.fi << " " << x.se << "\n";
  return 0;
}

Compilation message (stderr)

matching.cpp: In function 'int main()':
matching.cpp:62:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0 ; i < ord.size() ; i += 2){
                         ~~^~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 40
• Subtask 5: 0 / 52