Submission #402428

#	Time	Username	Problem	Language	Result	Execution time	Memory
402428		iulia13	Finding Routers (IOI20_routers)	C++14	96.67 / 100	2 ms	332 KiB

routers

#include "routers.h"
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
///last[x] <= last[x + 1]
vector<int> p;
int n;
int last[100005];
/*int use_detector(int x)
{
    vector<int>::iterator left, right;
    right = upper_bound(p.begin(), p.end(), x);
    left = prev(right);

    if (right == p.end()) {
        return n - 1;
    } else if ((x - *left) <= (*right - x)){
        return distance(p.begin(), left);
    } else {
        return distance(p.begin(), right);
    }
}*/

int caut(int ind, int st, int dr)
{
    int sol = 0;
    while (st <= dr)
    {
        int mid = (st + dr) / 2;
        int r = use_detector(mid);
        if (r < ind)
            st = mid + 1;
        else
        if (r > ind)
            dr = mid - 1;
        else
        {
            sol = mid;
            st = mid + 1;
        }
    }
    return sol;
}
void divide(int l, int r, int ql, int qr)
{
    if (l > r)
        return;
    int mid = (l + r) / 2;
    last[mid] = caut(mid, ql, qr);
    divide(l, mid - 1, ql, last[mid] - 1);
    divide(mid + 1, r, last[mid] + 1, qr);
}
vector<int> find_routers(int l, int n, int q)
{
    divide(0, n - 2, 0, l);
    vector <int> ans(n);
    ans[0] = 0;
    for (int i = 1; i < n; i++)
        ans[i] = 2 * last[i - 1] - ans[i - 1];
    return ans;
}/*
int main()
{
    int l, q;
    cin >> l >> n >> q;
    p.resize(n);
    for (int i = 0; i < n; i++)
        cin >> p[i];
    vector <int> ans = find_routers(l, n, q);
    for (int i = 0; i < n; i++)
        cout << ans[i] << " ";
    return 0;
}*/

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 36.6656 / 40