Submission #446689

#	Time	Username	Problem	Language	Result	Execution time	Memory
446689		dxz05	Birthday gift (IZhO18_treearray)	C++14	100 / 100	1325 ms	87864 KiB

treearray

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define revall(x) (x).rbegin(), (x).rend()

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.00001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 2e5 + 3e2;
const int M = 222;

vector<int> g[N];

int tin[N], tout[N], up[N][20], timer = 0;

void dfs(int v, int p){
    tin[v] = ++timer;
    up[v][0] = p;

    for (int i = 1; i < 20; i++){
        up[v][i] = up[up[v][i - 1]][i - 1];
    }

    for (int u : g[v]){
        if (u != p) dfs(u, v);
    }

    tout[v] = ++timer;
}

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

int lca(int a, int b){
    if (upper(a, b)) return a;
    if (upper(b, a)) return b;

    for (int i = 19; i >= 0; i--){
        if (!upper(up[a][i], b)) a = up[a][i];
    }

    return up[a][0];
}

int a[N];

set<int> positions[N];

inline void add(int i){
    int x = lca(a[i], a[i + 1]);
    positions[x].insert(i);
}

inline void del(int i){
    int x = lca(a[i], a[i + 1]);
    positions[x].erase(i);
}

set<int> pos[N];

void solve(int TC) {
    int n, m, q;
    cin >> n >> m >> q;

    for (int i = 1; i < n; i++){
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }

    dfs(1, 1);

    for (int i = 1; i <= m; i++){
        cin >> a[i];
        pos[a[i]].insert(i);
    }

    for (int i = 1; i < m; i++) add(i);

    while (q--){
        int t;
        cin >> t;

        if (t == 1){
            int i, v;
            cin >> i >> v;

            if (i > 1) del(i - 1);
            if (i < m) del(i);

            pos[a[i]].erase(i);
            pos[v].insert(i);

            a[i] = v;

            if (i > 1) add(i - 1);
            if (i < m) add(i);
        } else {
            int l, r, v;
            cin >> l >> r >> v;

            auto it = positions[v].lower_bound(l);
            auto it2 = pos[v].lower_bound(l);
            if (it != positions[v].end() && *it < r){
                int x = *it;
                cout << x << ' ' << x + 1 << endl;
            } else if (it2 != pos[v].end() && *it2 <= r){
                int x = *it2;
                cout << x << ' ' << x << endl;
            } else cout << -1 << ' ' << -1 << endl;

        }
    }

}

int main() {
    startTime = clock();
    cin.tie(nullptr); cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    bool llololcal = false;
#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    llololcal = true;
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

    if (llololcal) cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 26 / 26
• Subtask 4: 44 / 44