Submission #311269

#	Time	Username	Problem	Language	Result	Execution time	Memory
311269		OttoTheDino	Worm Worries (BOI18_worm)	C++17	10 / 100	1170 ms	416 KiB

worm

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

#define rep(n)      for (int i = 0; i < n; ++i)
#define rep2(n)     for (int j = 0; j < n; ++j)
#define mp          make_pair
#define pb          push_back
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;


array<int, 3> max_id (int i, int j1, int k1, int j2, int k2) {
    int ma = 0, cur, idj = j1, idk = k1;    
    for (int j = j1; j <= j2; ++j) {
        for (int k = k1; k <= k2; ++k) {
            cout << "? " << i << " " << j << " " << k << "\n" << flush;
            cin >> cur;
            if (cur==-1) return {-1, -1, -1};
            if (cur>ma) {
                ma = cur;
                idj = j, idk = k;
            }
        }
    }
    return {ma, idj, idk};
}

int main() {    
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    int n, m, k, q;
    cin >> n >> m >> k >> q;
  
    int lo = 1, hi = n, mid, l, r;
    array<int, 3> a;
    while (lo<hi) {
        mid = (lo+hi)/2, l = 0, r = 0;
        a = max_id(mid, 1, 1, m, k);
        if (a[0]==-1) return 0;
        if (mid>1) {
            cout << "? " << mid-1 << " " << a[1] << " " << a[2] << "\n" << flush;
            cin >> l;
            if (l==-1) return 0;
            if (l>a[0]) {
                hi = mid-1;
                continue;
            }
        }
        if (mid<n) {
            cout << "? " << mid+1 << " " << a[1] << " " << a[2] << "\n" << flush;
            cin >> r;
            if (r==-1) return 0;
            if (r>a[0]) {
                lo = mid+1;
                continue;
            }
        }
        lo = mid;
        break;
    }
    cout << "! " << lo << " " << a[1] << " " << a[2] << "\n" << flush;
    return 0;
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:65:57: warning: '*((void*)& a +8)' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |     cout << "! " << lo << " " << a[1] << " " << a[2] << "\n" << flush;
      |                                                         ^~~~
worm.cpp:65:42: warning: '*((void*)& a +4)' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |     cout << "! " << lo << " " << a[1] << " " << a[2] << "\n" << flush;
      |                                          ^~~

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