Submission #757080

#	Time	Username	Problem	Language	Result	Execution time	Memory
757080		maomao90	Worm Worries (BOI18_worm)	C++17	81 / 100	858 ms	232856 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[MAXN];
    int query(int x, int y, int z) {
        if (x > n) {
            return 0;
        }
        if (qry[x]) {
            return qry[x];
        }
        cout << "? " << x << ' ' << y << ' ' << z << endl;
        int ans; cin >> ans;
        if (ans == -1) exit(0);
        return qry[x] = ans;
    }
    int main() {
        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];
            assert(hi == lo + fib[k]);
            cerr << ' ' << mid1 << ' ' << mid2 << '\n';
            int l = query(mid1, 1, 1), r = query(mid2, 1, 1);
            if (l > r) {
                hi = mid2;
            } else {
                lo = mid1;
            }
        }
        assert(lo + 2 == hi);
        int l = query(lo, 1, 1), m = query(lo + 1, 1, 1), r = query(hi, 1, 1);
        if (l >= m) {
            guess(lo, 1, 1);
        } else if (m >= l && m >= r) {
            guess(lo + 1, 1, 1);
        } else {
            assert(r >= m);
            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;
    }
}

namespace st3 {
    const int MAXN = 1005;
    int qry[MAXN][MAXN];
    int fib[MAXN];
    int query(int x, int y, int z) {
        if (x > n || y > m) {
            return 0;
        }
        if (qry[x][y]) {
            return qry[x][y];
        }
        cout << "? " << x << ' ' << y << ' ' << z << endl;
        int ans; cin >> ans;
        if (ans == -1) exit(0);
        return qry[x][y] = ans;
    }
    int main() {
        int lo = 1, hi = n;
        int y;
        while (lo < hi) {
            int mid = lo + hi + 1 >> 1;
            int l = 0, r = 0;
            int mxl, mxr;
            REP (i, 1, m + 1) {
                if (mxto(l, query(mid - 1, i, 1))) {
                    mxl = i;
                }
            }
            REP (i, 1, m + 1) {
                if (mxto(r, query(mid, i, 1))) {
                    mxr = i;
                }
            }
            if (l < r) {
                lo = mid;
                y = mxr;
            } else {
                hi = mid - 1;
                y = mxl;
            }
        }
        int x = lo;
        guess(x, y, 1);
        return 0;
    }
}

namespace st6 {
    const int MAXN = 505;
    const int dirx[] = {1, -1, 0, 0, 0, 0}, diry[] = {0, 0, 1, -1, 0, 0}, dirz[] = {0, 0, 0, 0, 1, -1};
    mt19937 rnd(8);
    int qry[MAXN][MAXN][MAXN];
    int query(int x, int y, int z) {
        if (x > n || y > m || z > k || x <= 0 || y <= 0 || z <= 0) {
            return 0;
        }
        if (qry[x][y][z]) {
            return qry[x][y][z];
        }
        cout << "? " << x << ' ' << y << ' ' << z << endl;
        int ans; cin >> ans;
        if (ans == -1) exit(0);
        return qry[x][y][z] = ans;
    }
    int main() {
        int mx = -1, sx, sy, sz;
        REP (_, 0, q / 2) {
            int x = rnd() % n + 1, y = rnd() % m + 1, z = rnd() % k + 1;
            if (mxto(mx, query(x, y, z))) {
                sx = x; sy = y; sz = z;
            }
        }
        while (1) {
            bool fnd = 0;
            REP (d, 0, 6) {
                int nx = sx + dirx[d], ny = sy + diry[d], nz = sz + dirz[d];
                int nmx = query(nx, ny, nz);
                if (nmx > mx) {
                    fnd = 1;
                    sx = nx, sy = ny, sz = nz;
                    mx = nmx;
                    break;
                }
            }
            if (!fnd) {
                guess(sx, sy, sz);
                return 0;
            }
        }
        assert(0);
    }
}

int main() {
    cin >> n >> m >> k >> q;
    if (m == 1 && k == 1) {
        st2::main();
    } else if (k == 1) {
        st3::main();
    } else {
        st6::main();
    }
}

Compilation message (stderr)

worm.cpp: In function 'int st2::main()':
worm.cpp:79:13: warning: unused variable 'ans' [-Wunused-variable]
   79 |         int ans = -1;
      |             ^~~
worm.cpp: In function 'int st3::main()':
worm.cpp:138:31: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  138 |             int mid = lo + hi + 1 >> 1;
      |                       ~~~~~~~~^~~
worm.cpp:160:14: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  160 |         guess(x, y, 1);
      |         ~~~~~^~~~~~~~~
worm.cpp: In function 'int st6::main()':
worm.cpp:203:22: warning: 'sz' may be used uninitialized in this function [-Wmaybe-uninitialized]
  203 |                 guess(sx, sy, sz);
      |                 ~~~~~^~~~~~~~~~~~
worm.cpp:203:22: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
worm.cpp:203:22: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]

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