Submission #334549

#	Time	Username	Problem	Language	Result	Execution time	Memory
334549		rocks03	Finding Routers (IOI20_routers)	C++14	37 / 100	4 ms	492 KiB

routers

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define SZ(x) ((int)(x).size())
#define all(x) x.begin(), x.end()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int use_detector(int x);

void compute(int l, int r, int ql, int qr, vector<int>& ans){
    if(l == r){
        ans[ql] = 2 * (l - 1 - ans[ql - 1]) + ans[ql - 1];
        return;
    }
    int m = (l + r) / 2;
    int idx = use_detector(m);
    compute(l, m, ql, idx, ans);
    if(ans[idx] != -1)
        idx++;
    compute(m + 1, r, idx, qr, ans);
}

vector<int> find_routers(int l, int n, int q){
    vector<int> ans(n, -1);
    ans[0] = 0;
    compute(1, l, 1, n-1, ans);
    return ans;
}

Compilation message (stderr)

routers.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization("O3")
      | 
routers.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 | #pragma GCC optimization("unroll-loops")
      |

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