Submission #742419

#	Time	Username	Problem	Language	Result	Execution time	Memory
742419		maomao90	Worm Worries (BOI18_worm)	C++17	0 / 100	100 ms	308 KiB

worm

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 1000005;

int query(int x, int y, int z) {
    cout << "? " << x << ' ' << y << ' ' << z << endl;
	int ans; cin >> ans;
	if (ans == -1) exit(0);
	return ans;
}

void guess(int x, int y, int z) {
    cout << "! " << x << ' ' << y << ' ' << z << endl;
	exit(0);
}

int n, m, k, q;

namespace st2 {
    const int MAXN = 1000005;
    int qry[MAXN];
    int fib[50];
    int query(int x, int y, int z) {
        if (qry[x]) {
            return qry[x];
        }
        if (x > n) {
            return 0;
        }
        cout << "? " << x << ' ' << y << ' ' << z << endl;
        int ans; cin >> ans;
        if (ans == -1) exit(0);
        return qry[x] = ans;
    }
    int main() {
        REP (i, 1, n + 1) {
            query(i, 1, 1);
        }
        fib[0] = 1; fib[1] = 2;
        int gd = -1;
        REP (i, 2, 50) {
            fib[i] = fib[i - 1] + fib[i - 2];
            if (fib[i] + 1 >= n) {
                gd = i;
                break;
            }
        }
        int lo = 1, hi = fib[gd] + 1;
        int ans = -1;
        RREP (k, gd, 2) {
            int mid1 = lo + fib[k - 2], mid2 = lo + fib[k - 1];
            cerr << ' ' << mid1 << ' ' << mid2 << '\n';
            int l = query(mid1, 1, 1), r = query(mid2, 1, 1);
            if (l > r) {
                hi = mid2;
            } else {
                lo = mid1;
            }
        }
        int l = query(lo, 1, 1), m = query(lo + 1, 1, 1), r = query(hi, 1, 1);
        if (l > m && l > r) {
            guess(lo, 1, 1);
        } else if (m > l && m > r) {
            guess(lo + 1, 1, 1);
        } else {
            guess(hi, 1, 1);
        }
        /*
        int lo = 1, hi = n;
        while (lo < hi) {
            int mid = lo + hi + 1 >> 1;
            int l = query(mid - 1, 1, 1), m = query(mid, 1, 1);
            if (l < m) {
                lo = mid;
            } else {
                hi = mid - 1;
            }
        }
        guess(lo, 1, 1);
        */
        return 0;
    }
}

int main() {
    cin >> n >> m >> k >> q;
    if (m == 1 && k == 1) {
        st2::main();
    }
}

Compilation message (stderr)

worm.cpp: In function 'int st2::main()':
worm.cpp:82:13: warning: unused variable 'ans' [-Wunused-variable]
   82 |         int ans = -1;
      |             ^~~

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