Submission #1058879

#	Time	Username	Problem	Language	Result	Execution time	Memory
1058879		Thanhs	Kutije (COCI21_kutije)	C++14	70 / 70	117 ms	9556 KiB

Main

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
// #define double long double
 
#define endl '\n'
#define fastIO ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define setmin(x, y) x = min((x), (y))
#define setmax(x, y) x = max((x), (y))
#define sqr(x) ((x) * (x))
#define fi first
#define se second
#define all(x) x.begin(), x.end()
 
// mt19937 hdp(chrono::high_resolution_clock::now().time_since_epoch().count());
// int rand(int l, int r){return l + ((hdp() % (r - l + 1)) + r - l + 1) % (r - l + 1);}

const int NM = 1e3 + 5;
const int inf = 1e9;

int p[NM], n, m, q;

int find(int u) {return p[u] < 0 ? u : p[u] = find(p[u]);}
void join(int u, int v)
{
    u = find(u), v = find(v);
    if (u == v)
        return;
    if (p[u] > p[v])
        swap(u, v);
    p[u] += p[v];
    p[v] = u;
}

void solve()
{
    memset(p, -1, sizeof p);
    cin >> n >> m >> q;
    while (m--)
    {
        for (int i = 1; i <= n; i++)
        {
            int j;
            cin >> j;
            join(i, j);
        }
    }
    while (q--)
    {
        int u, v;
        cin >> u >> v;
        cout << (find(u) == find(v) ? "DA" : "NE") << endl;
    }
}

signed main()
{
    fastIO
    if (fopen("in.txt", "r")) 
    {
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    }
    int tc = 1;
    // cin >> tc;
    while (tc--)
        solve();
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen("in.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen("out.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 35 / 35