Submission #1038622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038622		eysbutno	Finding Routers (IOI20_routers)	C++17	100 / 100	3 ms	724 KiB

routers

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = array<int, 2>;
#define all(x) begin(x), end(x)
#define sz(x) (int) (x).size()

#include "routers.h"

vector<int> find_routers(int l, int n, int q) {
    vector<int> res(n), lb(n);
    set<pii> seen;
    for (int i = 1; i < n; i++) {
        int lo = max(res[i - 1] + 1, lb[i - 1]);
        int hi = l - 1;
        auto it = seen.lower_bound({i, -1});
        if (it != end(seen)) {
            hi = (*it)[1] - 1;
        }
        while (lo < hi) {
            int mi = (lo + hi + 1) / 2;
            int x = use_detector(mi);
            lb[x] = max(lb[x], mi);
            seen.insert({x, mi});
            (x == i - 1) ? lo = mi : hi = mi - 1;
        }
        res[i] = res[i - 1] + 2 * (lo - res[i - 1]);
    }
    return res;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 40 / 40