Submission #343513

#	Time	Username	Problem	Language	Result	Execution time	Memory
343513		Rakhmand	Segments (IZhO18_segments)	C++14	0 / 100	113 ms	65540 KiB

segments

#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#include <iterator>

using namespace std;

#define ios ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define no_answer {cout << "NO"; exit(0);}
#define FOR(i, start, finish, k) for(llong i = start; i <= finish; i += k)

const long long mxn = 2e5 + 110;
const long long mnn = 1e3 + 2;
const long long mod = 1e9 + 7;
const long long inf = 1e18;
const long long OO = 1e9;

typedef long long llong;
typedef unsigned long long ullong;

int n, m, q, d[mxn][20], lvl[mxn], a[mxn], ans[mxn];
vector<int> g[mxn];
set<int> st[mxn], stpos[mxn];

void dfs(int x, int p){
    lvl[x] = lvl[p] + 1;
    d[x][0] = p;
    for(int i = 1; i <= 18; i++){
        d[x][i] = d[d[x][i - 1]][i - 1];
    }
    for(auto to : g[x]){
        if(to != p)
            dfs(to, x);
    }
}

int lca(int u, int v){
    if(lvl[u] < lvl[v]){
        swap(u, v);
    }
    int dif = lvl[u] - lvl[v];
    for(int j = 0; j <= 18; j++){
        if((1 << j) & dif){
            u = d[u][j];
        }
    }
    if(u == v) return u;
    for(int i = 18; i >= 0; i--){
        if(d[u][i] != d[v][i]){
            u = d[u][i];
            v = d[v][i];
        }
    }
    return d[u][0];
}

void replace_pair(int pos, int type, int x){
    int anc = lca(a[pos], a[pos + type]);
    st[anc].erase(min(pos + type, pos));
    anc = lca(a[pos + type], x);
    st[anc].insert(min(pos + type, pos));
}

int main() {
    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, 0);
    for(int i = 1; i <= m; i++){
        cin >> a[i];
    }
    for(int i = 1; i <= m; i++){
        stpos[a[i]].insert(i);
        if(i != m){
            int u = i, v = i + 1;
            int anc = lca(a[u], a[v]);
            st[anc].insert(u);
        }
    }
    for(int i = 1; i <= q; i++){
        int t;
        cin >> t;
        if(t == 1){
            int pos, b;
            cin >> pos >> b;
            if(pos != 1){
                replace_pair(pos, -1, b);
            }
            if(pos != m){
                replace_pair(pos, 1, b);
            }
            stpos[a[pos]].erase(pos);
            stpos[b].insert(pos);
            a[pos] = b;
        }else{
            int l, r, b;
            cin >> l >> r >> b;
            set<int> :: iterator it = stpos[b].lower_bound(l);
            if(it != stpos[b].end() && l <= *it && *it <= r){
                cout << *it << ' ' << *it << nl;
                continue;
            }
            it = st[b].lower_bound(l);
            if(it == st[b].end()) {
                cout << -1 << ' ' << -1 << nl;
                continue;
            }
            if(*it < l){
                it++;
            }
            if(it == st[b].end()){
                cout << -1 << ' ' << -1 << nl;
                continue;
            }
            if(l <= *it && *it + 1 <= r){
                cout << *it << ' ' << *it + 1 << nl;
            }else{
                cout << -1 << ' ' << -1 << nl;
            }
        }
    }
}

/*
 5 4 4
 1 2
 3 1
 4 3
 5 3
 4 5 2 3
 2 1 3 1
 1 3 5
 2 3 4 5
 2 1 3 1
*/

• Subtask 1: 0 / 7
• Subtask 2: 0 / 15
• Subtask 3: 0 / 16
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20
• Subtask 6: 0 / 25