Submission #941652

#	Time	Username	Problem	Language	Result	Execution time	Memory
941652		benjaminkleyn	Finding Routers (IOI20_routers)	C++17	74.76 / 100	3 ms	860 KiB

routers

#include <bits/stdc++.h>
#include "routers.h"
using namespace std;

map<int, int> mem;
int detect(int x)
{
    if (mem.find(x) != mem.end())
        return mem[x];
    return mem[x] = use_detector(x);
}

vector<int> find_routers(int l, int n, int q) {
    l -= l % 2;
    mem = map<int, int>();
    vector<int> ans(n, 0);
    mem[0] = 0;

    for (int i = 0, x = 0; i < n - 1; i++)
    {
        int prev = x;
        for (int k = 7; k >= 0; k--)
            while (x + (1 << k) <= l && detect(x + (1 << k)) == i)
                x += (1 << k);
        ans[i + 1] = x + (x - ans[i]);
    }
	return ans;
}

Compilation message (stderr)

routers.cpp: In function 'std::vector<int> find_routers(int, int, int)':
routers.cpp:21:13: warning: unused variable 'prev' [-Wunused-variable]
   21 |         int prev = x;
      |             ^~~~

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 0 / 23
• Subtask 4: 37.7568 / 40