Submission #1116913

#TimeUsernameProblemLanguageResultExecution timeMemory
1116913vladiliusFinding Routers (IOI20_routers)C++17
77 / 100
3 ms796 KiB
#include <bits/stdc++.h>
#include "routers.h"
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second

vector<int> find_routers(int k, int n, int q){
    map<int, int> mp;
    auto f = [&](int x){
        auto it = mp.find(x);
        if (it != mp.end()){
            return (*it).ss;
        }
        
        auto it1 = mp.lower_bound(x);
        if (it1 != mp.end() && it1 != mp.begin() && (*it1).ss == (*prev(it1)).ss){
            mp[x] = (*it1).ss;
        }
        else {
            mp[x] = use_detector(x);
        }
        
        return mp[x];
    };
    
    vector<int> rr(n);
    function<void(int, int, int, int)> solve = [&](int l, int r, int l1, int r1){
        if (l > r) return;

        int m = (l + r) / 2, lb = l1, rb = r1;
        while (lb + 1 < rb){
            int mb = (lb + rb) / 2, t = f(mb);
            if (t > m){
                rb = mb;
            }
            else {
                lb = mb;
            }
        }
        while (f(rb) != m) rb--;
        
        rr[m] = rb;
        
        solve(l, m - 1, l1, rr[m]);
        solve(m + 1, r, rr[m], r1);
    };
    
    const int B = 100;
    int pr = 0;
    for (int i = 0; B * i <= k; i++){
        int r = min(k, B * (i + 1) - 1), p = f(r);
        solve(pr, p - 1, B * i, r);
        pr = p;
    }
    
    vector<int> out = {0};
    for (int i = 0; i < n - 1; i++){
        out.pb(2 * rr[i] - out.back());
    };
    return out;
}
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