Submission #1195826

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195826		badge881	Make them Meet (EGOI24_makethemmeet)	C++20	70 / 100	5 ms	584 KiB

Main

#include <bits/stdc++.h>

using namespace std;

long long N, M;
vector<vector<int>> graph;
vector<vector<int>> matrix;

vector<int> p1, p2;
vector<int> vis;

void dfs(int n, int parity)
{
    vis[n] = true;
    for (auto go : graph[n])
    {
        if (vis[go])
            continue;
        if (parity)
        {
            p2[go] = p2[n];
        }
        else
        {
            p1[go] = p1[n];
        }
        dfs(go, 1 - parity);
    }
}

int main()
{
    scanf("%lld%lld", &N, &M);
    graph.resize(N),
        matrix.resize(N, vector<int>(N)),
        p1.resize(N),
        p2.resize(N),
        vis.resize(N, false);
    for (int i = 0; i < M; i++)
    {
        int a, b;
        scanf("%d%d", &a, &b);
        matrix[a][b] = 1;
        matrix[b][a] = 1;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    for (int i = 0; i < N; i++)
    {
        p1[i] = i + 1;
        p2[i] = i + 1;
        matrix[i][i] = 1;
    }
    int root = -1;
    for (int i = 0; i < N; i++)
    {
        for (auto j : graph[i])
        {
            for (auto u : graph[j])
                if (matrix[i][u] == 0)
                {
                    p2[j] = p2[u] = p2[i];
                    vis[u] = true;
                    dfs(i, 0);
                    dfs(u, 0);
                    root = j;
                    break;
                }
            if (root != -1)
                break;
        }
        if (root != -1)
            break;
    }
    if (root == -1)
        dfs(0, 0);
    printf("600\n");
    for (int i = 0; i < 300; i++)
    {
        for (int k = 0; k < N; k++)
            printf("%d ", p2[k]);
        printf("\n");
        for (int k = 0; k < N; k++)
            printf("%d ", p1[k]);
        printf("\n");
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%lld%lld", &N, &M);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 11 / 11
• Subtask 4: 36 / 36
• Subtask 5: 0 / 30