Submission #399889

#	Time	Username	Problem	Language	Result	Execution time	Memory
399889		Sorting	Worm Worries (BOI18_worm)	C++17	10 / 100	1 ms	328 KiB

worm

#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 3;
const double C = 0.6180339;

mt19937 mt(95);

int n, m, k, q;
int arr[N];

int query(int x){
    if(arr[x]) return arr[x];
    cout << "? " << x << " " << 1 << " " << 1 << "\n";
    cout.flush();
    cin >> arr[x];
    return arr[x];
}

void answer(int x){
    cout << "! " << x << " " << 1 << " " << 1 << "\n";
    cout.flush();
    exit(0);
}

int rand_except(int l, int r, int prev){
    int t = mt() % (r - l + 1) + l;
    if(t != prev) return t;
    return rand_except(l, r, prev);
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> m >> k >> q;

    int l = 1, r = n, prev = mt() % n + 1;
    while(l != r){
        int nxt = rand_except(l, r, prev); 
        if(prev > nxt) swap(prev, nxt);
        int a = query(prev), b = query(nxt);
        if(a >= b){
            r = nxt - 1;
        }
        else{
            l = prev + 1;
            prev = nxt;
        }
    }
    answer(l);
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 22
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 14
• Subtask 6: 0 / 23