Submission #541426

#	Time	Username	Problem	Language	Result	Execution time	Memory
541426		Lobo	Worm Worries (BOI18_worm)	C++17	0 / 100	3079 ms	336 KiB

worm

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

const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
// #define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

const int maxn = 1e6 + 10;

int n,aux,a[maxn];

int qrr(int x) {
    if(x == 0 || x == n+1 || a[x] != 0) return a[x];

    cout << "? " << x << " 1 1" << endl;
    int o; cin >> o;
    return o;

}

void solve() {
    cin >> n >> aux >> aux >> aux;

    int l = 1;
    int r = n;
    int m1 = (l+r)/2;
    a[m1] = qrr(m1);

    int ans;
    while(l < r) {
        int mid = (l+r)/2;

        int m2 = mid;
        if(m1 == m2) {
            m2++;
        }

        if(m1 > m2) swap(m1,m2);
        a[m1] = qrr(m1);
        a[m2] = qrr(m2);
    
        if(a[m1] >= a[m2]) {
            //interval (l,m2-1)
            ans = l;
            r = m2-1;
        }
        else {
            //interval (m1+1,r)
            ans = r;
            l = m1+1;
        }
    }

    cout << "! " << ans << " 1 1" << endl;
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    // freopen("out.out", "w", stdout);

    int tt = 1;
    // cin >> tt;
    while(tt--) solve();

}

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