Submission #1122608

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122608		otarius	Pictionary (COCI18_pictionary)	C++20	140 / 140	188 ms	15164 KiB

pictionary

#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rngl(chrono::steady_clock::now().time_since_epoch().count());

// #define int long long
// #define int unsigned long long

// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>

void open_file(string filename) {
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}

// const ll mod = 1e9 + 7;
// const ll mod = 998244353;

const ll inf = 1e9;
const ll biginf = 1e18;
const int maxN = 1e5 + 25;

vector<int> qs[maxN];
int par[maxN], sz[maxN];
void make_set() {
    for (int i = 1; i < maxN; i++) {
        par[i] = i; sz[i] = 1;
    }
}
int find_set(int x) {
    if (par[x] == x)
        return x;
    return par[x] = find_set(par[x]);
}
void union_set(int x, int y) {
    x = find_set(x);
    y = find_set(y);
    if (x == y) return;
    if (sz[x] < sz[y]) swap(x, y);
    sz[x] += sz[y]; par[y] = x;
}
void solve() {
    int n, m, q;
    cin >> n >> m >> q;
    int x[q + 1], y[q + 1], l[q + 1], r[q + 1], ans[q + 1];
    for (int i = 1; i <= q; i++) {
        cin >> x[i] >> y[i];
        l[i] = 1; r[i] = m; ans[i] = -1;
    } while (1) {
        bool f = 1; make_set();
        for (int i = 1; i <= q; i++) {
            if (l[i] > r[i]) continue;
            qs[(l[i] + r[i]) / 2].pb(i); f = 0;
        } if (f) break;
        for (int i = 1; i <= m; i++) {
            for (int j = m - i + 1; j <= n; j += m - i + 1) union_set(m - i + 1, j);
            for (int j : qs[i]) {
                if (find_set(x[j]) == find_set(y[j])) {
                    ans[j] = i; r[j] = i - 1;
                } else l[j] = i + 1;
            }
        } for (int i = 1; i < maxN; i++) qs[i].clear();
    } for (int i = 1; i <= q; i++) cout << ans[i] << '\n';
}
int32_t main() { 
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    }
    return 0;
}

Compilation message (stderr)

pictionary.cpp: In function 'void open_file(std::string)':
pictionary.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pictionary.cpp:31:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14