CSES - Aalto Competitive Programming 2024 - wk2 - Mon - Results
Submission details
Task:Building Teams
Sender:bielaltes
Submission time:2024-09-09 16:36:28 +0300
Language:C++ (C++11)
Status:READY
Result:ACCEPTED
Test results
testverdicttime
#1ACCEPTED0.00 sdetails
#2ACCEPTED0.00 sdetails
#3ACCEPTED0.00 sdetails
#4ACCEPTED0.00 sdetails
#5ACCEPTED0.00 sdetails
#6ACCEPTED0.20 sdetails
#7ACCEPTED0.20 sdetails
#8ACCEPTED0.20 sdetails
#9ACCEPTED0.20 sdetails
#10ACCEPTED0.17 sdetails
#11ACCEPTED0.00 sdetails
#12ACCEPTED0.00 sdetails

Compiler report

input/code.cpp: In function 'int main()':
input/code.cpp:48:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for (int i = 1; i < colours.size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~~~
input/code.cpp:50:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         if (i +1 != colours.size())
      |             ~~~~~^~~~~~~~~~~~~~~~~

Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std;

void dfs_bipartite(int node, int new_col, const vector<vector<int>>& friends, vector<int>& colours) {
    colours[node] = new_col;
    for (int neighbor : friends[node]) {
        if (!colours[neighbor]) {
            if (new_col == 1)
                dfs_bipartite(neighbor, 2, friends, colours);
            else 
                dfs_bipartite(neighbor, 1, friends, colours);
        }
        else if (colours[neighbor] && colours[neighbor] == colours[node]){
            cout << "IMPOSSIBLE" << endl;
            exit(0);
        }
    }
}

int main() {
    
    int n, m;

    cin >> n >> m;

    vector< vector<int> > friends = vector<vector<int> >(n+1);
    for (int i = 0; i < m; ++i)
    {
        int aux1, aux2;

        cin >> aux1 >> aux2;

        friends[aux1].push_back(aux2);
        friends[aux2].push_back(aux1);
    }

    vector<int> colours(n + 1, 0);

    for (int i = 1; i <= n; ++i) {
        if (!colours[i]) {
            dfs_bipartite(i, 1, friends, colours);
        }
    }

    for (int i = 1; i < colours.size(); ++i) {
        cout << colours[i];
        if (i +1 != colours.size())
            cout << " ";
    }
    cout << endl;

}

Test details

Test 1

Verdict: ACCEPTED

input
10 20
3 4
8 10
3 7
1 8
...

correct output
1 1 1 2 2 1 2 2 2 1 

user output
1 1 1 2 2 1 2 2 2 1

Test 2

Verdict: ACCEPTED

input
10 20
1 3
8 10
2 4
6 8
...

correct output
1 1 2 2 1 1 1 2 1 1 

user output
1 1 2 2 1 1 1 2 1 1

Test 3

Verdict: ACCEPTED

input
10 20
7 10
3 10
9 10
2 10
...

correct output
1 2 2 1 1 1 2 1 2 1 

user output
1 2 2 1 1 1 2 1 2 1

Test 4

Verdict: ACCEPTED

input
10 20
2 4
2 10
7 10
4 6
...

correct output
1 2 1 1 2 2 2 1 2 1 

user output
1 2 1 1 2 2 2 1 2 1

Test 5

Verdict: ACCEPTED

input
10 20
3 5
8 10
9 10
1 8
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 6

Verdict: ACCEPTED

input
100000 200000
47355 96505
90709 92058
735 80715
91802 94265
...

correct output
1 2 2 1 2 1 1 1 2 2 1 2 1 1 1 ...

user output
1 2 2 1 2 1 1 1 2 2 1 2 1 1 1 ...
Truncated

Test 7

Verdict: ACCEPTED

input
100000 200000
59991 95794
95150 96051
78453 94730
90411 95523
...

correct output
1 1 1 2 2 1 1 2 1 2 1 2 2 2 1 ...

user output
1 1 1 2 2 1 1 2 1 2 1 2 2 2 1 ...
Truncated

Test 8

Verdict: ACCEPTED

input
100000 200000
89827 96402
65137 86792
80965 94708
19479 48078
...

correct output
1 2 1 1 2 1 2 2 2 1 2 1 1 2 1 ...

user output
1 2 1 1 2 1 2 2 2 1 2 1 1 2 1 ...
Truncated

Test 9

Verdict: ACCEPTED

input
100000 200000
72952 83723
66197 70052
2949 52160
55753 95651
...

correct output
1 1 2 2 2 1 1 2 2 2 2 2 1 2 1 ...

user output
1 1 2 2 2 1 1 2 2 2 2 2 1 2 1 ...
Truncated

Test 10

Verdict: ACCEPTED

input
100000 200000
38942 96755
70049 82663
7746 72732
87819 99029
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 11

Verdict: ACCEPTED

input
5 4
1 2
3 4
4 5
5 3

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 12

Verdict: ACCEPTED

input
4 5
1 2
1 4
2 3
2 4
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE