oj.uz

Submission #749928

# Submission time Handle Problem Language Result Execution time Memory
749928 2023-05-29T01:28:57 Z Trunkty Matching (COCI20_matching) C++14
5 / 110
 5 ms 7384 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

int n;
vector<int> row[100005],col[100005];
int root[100005];
vector<int> vals[100005];
vector<vector<int>> ans;

int findroot(int x){
    if(root[x]!=x){
        root[x] = findroot(root[x]);
    }
    return root[x];
}

void domerge(int a, int b){
    int x = findroot(a), y = findroot(b);
    if(x==y){
        return;
    }
    else{
        if(vals[x].size()<vals[y].size()){
            swap(x,y);
            swap(a,b);
        }
        if(vals[x][0]==a){
            reverse(vals[x].begin(),vals[x].end());
        }
        if(vals[y][0]!=b){
            reverse(vals[y].begin(),vals[y].end());
        }
        for(int i:vals[y]){
            vals[x].push_back(i);
        }
        vals[y].clear();
        root[y] = x;
    }
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for(int i=1;i<=n;i++){
        root[i] = i;
        vals[i].push_back(i);
    }
    for(int i=1;i<=n;i++){
        int a,b;
        cin >> a >> b;
        row[a].push_back(i);
        col[b].push_back(i);
    }
    for(int i=1;i<=1e5;i++){
        if(row[i].size()==2){
            domerge(row[i][0],row[i][1]);
        }
    }
    for(int i=1;i<=1e5;i++){
        if(col[i].size()==2){
            domerge(col[i][0],col[i][1]);
        }
    }
    for(int i=1;i<=n;i++){
        if(root[i]==i){
            if(vals[i].size()%2){
                cout << "NE" << "\n";
                return 0;
            }
            for(int j=0;j<vals[i].size();j+=2){
                ans.push_back({vals[i][j],vals[i][j+1]});
            }
        }
    }
    cout << "DA" << "\n";
    for(vector<int> i:ans){
        cout << i[0] << " " << i[1] << "\n";
    }
    return 0;
}

Compilation message

matching.cpp: In function 'int main()':
matching.cpp:73:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |             for(int j=0;j<vals[i].size();j+=2){
      |                         ~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7384 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7252 KB Output is correct
6 Incorrect 4 ms 7372 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7384 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7252 KB Output is correct
6 Incorrect 4 ms 7372 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7384 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7252 KB Output is correct
6 Incorrect 4 ms 7372 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7252 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7384 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7252 KB Output is correct
6 Incorrect 4 ms 7372 KB Output isn't correct
7 Halted 0 ms 0 KB -