Submission #215947

#	Time	Username	Problem	Language	Result	Execution time	Memory
215947		SamAnd	Fire drill (LMIO18_sauga)	C++17	59.51 / 100	808 ms	3064 KiB

sauga

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
const int N = 1003;

mt19937 rnd(132143134);

int tt, n, ss;
vector<int> a[N];

int u[N];

vector<int> v;
bool c[N];
void dfs(int x)
{
    c[x] = true;
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (!c[h])
            dfs(h);
    }
    v.push_back(x);
}

int ansq;
vector<int> ans;

int main()
{
    scanf("%d%d%d", &tt, &n, &ss);
    for (int i = 1; i <= n; ++i)
    {
        int q;
        scanf("%d", &q);
        while (q--)
        {
            int x;
            scanf("%d", &x);
            a[i].push_back(x);
        }
    }
    for (int i = 1; i <= n; ++i)
        u[i] = i;
    while ((double)clock() / CLOCKS_PER_SEC < 0.8)
    {
        for (int i = n; i >= 1; --i)
        {
            swap(u[i], u[rnd() % i + 1]);
        }
        for (int i = 1; i <= n; ++i)
        {
            for (int j = (int)a[i].size() - 1; j >= 0; --j)
            {
                swap(a[i][j], a[i][rnd() % (j + 1)]);
            }
        }
        memset(c, false, sizeof c);
        v.clear();
        for (int i = 1; i <= n; ++i)
        {
            int x = u[i];
            if (!c[x])
                dfs(x);
        }
        memset(c, false, sizeof c);
        int q = 0;
        for (int i = 0; i < n; ++i)
        {
            int x = v[i];
            for (int j = 0; j < a[x].size(); ++j)
            {
                int h = a[x][j];
                if (!c[h])
                {
                    ++q;
                    break;
                }
            }
            c[x] = true;
        }
        if (ans.empty() || q < ansq)
        {
            ans = v;
            ansq = q;
        }
    }
    for (int i = 0; i < n; ++i)
        printf("%d\n", ans[i]);
    return 0;
}

Compilation message (stderr)

sauga.cpp: In function 'void dfs(int)':
sauga.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
sauga.cpp: In function 'int main()':
sauga.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j = 0; j < a[x].size(); ++j)
                             ~~^~~~~~~~~~~~~
sauga.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &tt, &n, &ss);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sauga.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &q);
         ~~~~~^~~~~~~~~~
sauga.cpp:40:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &x);
             ~~~~~^~~~~~~~~~

• Subtask 1: 59.50724297677 / 100