제출 #685147

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
685147		stanislavpolyn	Joker (BOI20_joker)	C++17	0 / 100	151 ms	67356 KiB

Joker

#include <bits/stdc++.h>

#define fr(i, a, b) for (int i = (a); i <= (b); ++i)
#define rf(i, a, b) for (int i = (a); i >= (b); --i)
#define fe(x, y) for (auto& x : y)

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple

#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define pw(x) (1LL << (x))

using namespace std;

mt19937_64 rng(228);

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key

template <typename T>
bool umx(T& a, T b) {
    return a < b ? a = b, 1 : 0;
}
template <typename T>
bool umn(T& a, T b) {
    return a > b ? a = b, 1 : 0;
}

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T>
using ve = vector<T>;

const int N = 2e5 + 5;

int n, m, q;
ve<pii> e;
int ans[N];

int link[N];
ve<int> g[N];

int root(int x) {
    if (link[x] == x) {
        return x;
    } else {
        return link[x] = root(link[x]);
    }
}

bool uni(int a, int b) {
    a = root(a);
    b = root(b);
    if (a == b) {
        return 0;
    }
    link[a] = b;
    return 1;
}

int dep[N];
int up[N][20];
int tin[N], tout[N], timer;
bool vis[N];
ve<pii> ask[N];

void dfs(int v, int p) {
    vis[v] = 1;
    tin[v] = timer++;
    up[v][0] = p;
    fr (i, 1, 19) {
        up[v][i] = up[up[v][i - 1]][i - 1];
    }

    fe (to, g[v]) {
        if (to == p) continue;
        dep[to] = dep[v] + 1;
        dfs(to, v);
    }

    tout[v] = timer;
}

bool isUpper(int a, int b) {
    return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int getLCA(int a, int b) {
    if (isUpper(a, b)) return a;
    if (isUpper(b, a)) return b;

    rf (i, 19, 0) {
        if (up[a][i] && !isUpper(up[a][i], b)) {
            a = up[a][i];
        }
    }
    return up[a][0];
}

int getDist(int a, int b) {
    int c = getLCA(a, b);
    return dep[a] + dep[b] - 2 * dep[c];
}

int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    ios::sync_with_stdio(0);
    cin.tie(0);
#endif

    cin >> n >> m >> q;

    fr (i, 1, m) {
        int a, b;
        cin >> a >> b;
        e.pb({a, b});
    }


    fr (i, 0, m - 1) {
        e.pb(e[i]);
    }


    fr (i, 1, q) {
        int l, r;
        cin >> l >> r;

        l--;
        r--;
        // r+1..m-1+l

        ask[m - 1 + l].pb({r + 1, i});

//        cout << "REAL " << r + 1 << " " << m - 1 + l << "\n";
    }

    fr (i, 0, sz(e) - 1) {
        if (sz(ask[i])) {
            sort(all(ask[i]));
            reverse(all(ask[i]));

            iota(link, link + n + 1, 0);
            fr (j, 1, n) g[j].clear();

            rf (j, i, 0) {
                if (uni(e[j].fi, e[j].se)) {
                    g[e[j].fi].pb(e[j].se);
                    g[e[j].se].pb(e[j].fi);
                }
            }
            fr (v, 1, n) {
                fr (p, 0, 19) {
                    up[v][p] = 0;
                }
            }

            fill(vis + 1, vis + 1 + n, 0);
            fr (v, 1, n) {
                if (!vis[v]) {
                    timer = 0;
                    dep[v] = 0;
                    dfs(v, 0);
                }
            }

            iota(link, link + n + 1, 0);

            bool ok = 0;
            int ptr = 0;
            rf (j, i, 0) {
                if (uni(e[j].fi, e[j].se)) {

                } else {
                    int d = getDist(e[j].fi, e[j].se);
                    if (d % 2 == 0) {
                        ok = 1;
                    }
                }

                while (ptr < sz(ask[i]) && ask[i][ptr].fi == j) {
                    ans[ask[i][ptr].se] = ok;
                    ptr++;
                }
            }
        }
    }

    fr (i, 1, q) {
        if (ans[i]) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }

    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 8
• Subtask 3: 0 / 25
• Subtask 4: 0 / 10
• Subtask 5: 0 / 22
• Subtask 6: 0 / 29